test-drb

test-drb@ccmp.vtda.org

101090 discussions

by quapla＠xs4all.nl

I got this email from Cole Petersburg (cpetersbur3 at gatech.edu). He has an 11/24 availabe, please contact him directly if interested. Information I got : +++++++ PDP-11/24, cosmetic damage to knob, 3U height, 19" rack RX02 dual 8" floppy drive "Computer interface unit" HP monitor Keyboard All cables, former positions are written down Little or no documentation Floppy disks, few or no useful ones Solid state relay - possibly belonging to the computer interface unit Provenance: It came from a PHI-600 Scanning Auger system, purchased around 1986. It ran RT-11, captured images, and printed them to a Tektronix printer. The printer was left with the previous owner. The PDP will be replaced with a PCI card from RBD Instruments. Current owner: I'll need to discuss transfer of ownership with my advisor at Georgia Institute of Technology. ++++++

18 years, 3 months

DEC Keyboard Mouse Emulator (was RE: Backing up VAX/VMS?)

by ajp166＠bellatlantic.net

> >Subject: Re: DEC Keyboard Mouse Emulator (was RE: Backing up VAX/VMS?) > From: Jim Brain <brain at jbrain.com> > Date: Sun, 13 Jan 2008 14:22:49 -0600 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Bob Armstrong wrote: >> >>> I found details of the keyboard and mouse protocol in the back of >>> a Microvax manual, and have been toying with the idea of building >>> a small embedded controller to take a PC (PS2) keyboard and mouse, >>> and emulate the DEC equivalents to the VAX - would anyone else be >>> interested in this? >>> >> >> I'd be very interested, not because I have a shortage of DEC keyboards or >> mice, but because it'd allow me to use my VAXstation or PRO-380 on a KVM >> switch along with various PCs. The KVM switch can handle the video, but it >> can't cope with the DEC keyboards and mice. >> >> I suspect that this may not be as easy as you think, but if you're serious >> I'll build the hardware if you write the firmware. >> >Would this work help in any way: > >http://www.kbdbabel.org/ > >"PS2 Keyboard ---> DEC VT320 ..." Save for theres nothing I can find at the site of anything for that. It appears thats a "proposed" project. I checked SourceForge and didn't find any code there. Briefly: PS2 keyboard do a scan code and send it serially with a sperate clock line. They also use the same serial path to recieve data. DEC keyboards also use a serial path save for it's RS423 and at 4800 baud RS423. The format of the data is different (not scancode!). Here is a site that has the basic LK201 data: http://www.netbsd.org/docs/Hardware/Machines/DEC/lk201.html#electrical To go from PS2 to DEC one must both reconcile the different codings and how data is transmitted. I'd say PS2 to DEC is easiest direction as the PS2 scan codes are known and can be translated to anything. I believe the DEC keyboard uses a simpler code that is one byte for keydown and another for keyup. Allison > >Jim

18 years, 3 months

PET power supply questions

by dm561＠torfree.net

-----------Original Message: Date: Sat, 12 Jan 2008 23:51:21 +0000 From: Ethan Dicks <ethan.dicks at usap.gov> Subject: PET power supply questions Hi, all, I've been collecting various classic bits to work on over the winter, including a pre-CTRC 32K PET board (2001-N/3032) and a Static PET board. I don't have any cases or accessories, but I do have a C2N232, a single bare keyboard, and a C=Key converter enroute. For video, I was planning on trying that ancient XOR circuit to make composite video >from sync and video, and feed that to an old Panasonic mono CRT I saved >from scrap. What I'm lacking at this point is a power supply. Obviously, I'm unlikely to find a suitable mains transformer, so I was going to cobble up some form of switcher that puts out enough of the right voltages to make this all work. Poring over the schematics for the 2001-N board on zimmers.net (e.g. 320349-9.gif), I'm guessing that the onboard regulator circuit is pumping out +5VDC at over 5A, +12VDC at a couple of amps, and a miniscule amount of -5VDC. I'm not running a real tape drive, so I'm not as worried about the +9VDC unreg. Does anyone have any reasonable estimates or real-world measurements for the current draw on the various supply lines? Has anyone out there ever gotten a PET to run from externally regulated DC? Thanks, -ethan ------------Reply: I haven't done it but, since I've also got a board and lower case w/kbd & cassette but no monitor or PS xfmr, it's also on my to-do-someday list to put it together with a small switching supply and composite monitor. I don't have a DRAM 2001N, and it's a little awkward to check the current on my 8032, but an SRAM 2001-8 identical to the one I sent you (but with chips;-) draws 2.8A on the unregulated 8.5V which feeds 4 LM305s, so the actual 5V draw would probably be slightly less. I'd think that any common +5/+12/-5 supply with >5A on the 5V would do just fine for both your boards, and if you don't need the cassette a single 5V supply would do the SRAM version. mike

18 years, 3 months

youtube movie of making a vacuum triode.

by fireflyst＠earthlink.net

This is precisely the reason I unsubscribed from cctalk and subscribed to cctech. Yet, crap like this still gets through. Suck. -----Original Message----- >From: jpero at sympatico.ca >Sent: Jan 8, 2008 12:53 PM >To: cctalk at classiccmp.org >Subject: youtube movie of making a vacuum triode. > >This is in french but the video is priceless! 17 minutes long. >Worth taking your favorite drink and take a seat. > >http://blog.makezine.com/archive/2008/01/make_your_own_vaccum_tube.ht >ml > >Cheers, Wizard

18 years, 3 months

vintagecomputermarketplace.com down?

by dgriffi＠cs.csubak.edu

Does anyone here know what's up with vintagecomputermarketplace.com? -- David Griffith dgriffi at cs.csubak.edu

18 years, 3 months

Wavemate Bullet / Wave Mate Bullet

by lynchaj＠yahoo.com

> -----Original Message----- > From: Andrew Lynch [mailto:lynchaj at yahoo.com] > Sent: Sunday, January 13, 2008 1:31 PM > To: 'cctalk at classiccmp.org' > Subject: Wavemate Bullet / Wave Mate Bullet > > Hi, > > Does anyone have a WaveMate Bullet machines? Does it work? > > It appears to be a single board CP/M computer with two 5.25" floppy disk > drives. > > Thanks! > > Andrew Lynch [AJL>] I think I'll clarify my post a bit... :-) I recently bought what I thought was an external dual 5.25" drive on Ebay but it turned out to be a Wave Mate Bullet single board computer. It came with two floppy drives and it *appears* to be in working order. However, I do not have boot disks to verify if it works or not. If anyone has any boot disks for this system, please reply here or contact me off list. The system uses soft sector disks so all I need is disk images we can make with ImageDisk. Probably, you don't even need a working machine since the disk drives are 96tpi floppy drives which can be read on a PC with a 1.2 MB HD floppy disk drive. Thanks in advance for any help! Andrew Lynch PS, here is the manual at bitsavers (Thanks Modem7): http://bitsavers.org/pdf/wavemate/Wave_Mate_Bullet_SBC.pdf

18 years, 3 months

Keybard repair help. Older terminals

by g-wright＠att.net

I seem to have my share of Terminals that have bad keyboard parts. 3 that I'm working now have the same type of Keyboard. These are Hazeltine 1500 and ADM 3As. These have an molded base with fingers that stick up and a second square piece that slide into the base and makes and breaks the finger contact. It also has a square opening in the top for the key cap. So when someone drops a heavy object on the the key board this intermediate piece cracks in the corners and binds in the base. What I would like to find is a doner type of system that does not have any value so I can rob the middle piece.. (typewiter) ??? Tandy (Archer) sold a Alpha-Numrtic keyboard that said it was made for the TI 99/4 computer. It used the same switch type keyboard. - Jerry Jerry Wright g-wright at att.net

18 years, 3 months

Sony 2.88 floppy pin outs needed

by g-wright＠att.net

Hi, I'm working on putting a 2.88 Sony floppy on a NeXT Cube that was upgraded to a 68040. So it has a floppy connection on the mother board. I have the pin-outs for the Next but not for the Floppy. Since the power comes through the interface cable and so does other 2.88 specific signals, I dont want to take a chance on trial by Error........ Looks like there was a ever changing standard on the 2.88 interface. Can't seem to find any searches that help. Drive is a Sony MP-F40W-25 Thanks, Jerry Jerry Wright g-wright at att.net

18 years, 3 months

Backing up VMS

by ajp166＠bellatlantic.net

> >Subject: Re: Backing up VMS > From: Scott Quinn <compoobah at valleyimplants.com> > Date: Sun, 13 Jan 2008 08:34:51 -0800 > To: cctalk at classiccmp.org > > >On Jan 13, 2008, at 1:05 AM, Dave Dunfield wrote: > >> >>>> My immediate concern is that I'd like to make a full backup >>>> of the VMS 5.5 on the VLC, and also attempt restoring it to >>>> another drive. >> >>> The VLC is simply SCSI based, isn't it? I wouldn't bother with >>> doing a >>> file-based backup, just because the SCSI drive will probably be >>> "quite >>> small" compared to today's drives. Just attach it to some other box >>> and do a block-copy of the whole drive. That'll create a file of eg. >>> 4GB in size with everything in it, including partitioning and all the >>> file system(s). Simple to create, simple to restore to this or an >>> identical drive. >> >> I've already done that - I put the drive from the VLC as an external >> drive on the 3100 running NETBSD and dd'd it into an image file - but >> my goal is to be able to survive a drive failure, and possibly also >> move it to a larger drive. The original drive in question is an RZ23, >> which is a 100M DEC labled Conner drive - I have three other similar >> drives, two labled RZ23 and one Conner that are "really close" but >> not exactly the same - apparently there were slightly different >> variations and versions. >> >>> You'd probably do a file-based backup additionally to be able to >>> restore to a different medium, though. >> >> Exactly. If I understand it correctly, an image backup should restore >> to any drive, and is the best way to insure that I can rebuild the >> system in the future. > >Why not write out a BACKUP tape with standalone BACKUP at the front >so you can do a restore install? Only read about it being done on >TKxx/TZxx drives, but it would be worth looking into, as it is the >"official" DEC way to build a restorable backup (and is how they >shipped the VMS tape distros) (haven't read too much about it because >I don't have any CompacTape media right now). You can do that to a SCSI drive or any media large enough and recongnized by the system. That means TKxx, TZxx, RDxx (RD54 at 150mb is large enough for preV6 VMS), Any of the RZ drives large enough (I use RZ55s and 56s). Allison

18 years, 3 months

Wavemate Bullet / Wave Mate Bullet

by lynchaj＠yahoo.com

Hi, Does anyone have a WaveMate Bullet machines? Does it work? It appears to be a single board CP/M computer with two 5.25" floppy disk drives. Thanks! Andrew Lynch

18 years, 3 months

Tandon TM100 track 0 switch

by ard＠p850ug1.demon.co.uk

Just in case anyome else fixes TM100s... As is well-known, the track0 sensor in these drives is a microswitch. It's a standard V?-size one, but iwth a low operating force. One of mine failed (in an HP9836, if it matters), and I've found that RS (not Radio Shack, but http://www.rswww.com) 472-8005 is a perfect replacement. It's got the same connecitons (simply move the wires over tag-to-tag), and fits the original brackets with no problems. -tony

18 years, 3 months

Creating new CP/M disks - Progress on IMSAI

by cclist＠sydex.com

> From: M H Stein <dm561 at torfree.net> > Interestingly, Andrew Lynch apparently got a different version of the GFR > (-149 IIRC) to work on his Vector with HS disks, whereas my -159 never > goes ready at all with HS disks. I was trying to oversimplify a bit on my reply; Teac drives across any single product line have a tremendous potential for variability. The last thing in the world I wanted was for someone to hunt down a set of FD-55GFR drives and report back that they didn't work. The same variability is present in 3.5" Teac drives--the 235HFs come in many varieties; some offer many options; others offer next to none. Undocumented jumpers and pads on drive PCBs are even wilder in assortment and presence/absence. I've had pretty good luck with Mitsubishi and NEC floppy drives manufactured for the Japanese market (PC9801-style systems). As the floppy format is based on an 8" model and doesn't change much across physical formats, the drives themselves tend to behave when pressed into use in 8" applications. They can be tough to find on this side of the Pacific, however. Generally, the later a drive is manufactured, the more "smarts" are used in its drive control logic--and the less it will be suited for non-PC use. I was surprised to find that there's a Toshiba 3.5" floppy (ca. 1996) that senses the data rate on HD diskettes and automatically changes its spindle speed. You can read, write and format 1440 KB on it and read and write 1232 KB, much like many USB and IDE floppy drives. The idea probably was that there were still a lot of DOS-V format floppies hanging around Japan and wouldn't it be nice to be able to read and write them on a "generic" PC... Heaven only knows what the drive would do with some nonstandard data rate or modulation. Hope this helps, Chuck

18 years, 3 months

WHOOPS Mac powerpc 8500 200 not 8100.

by jpero＠sympatico.ca

Whoops! Susplus to me now, in parts or whole for little money. Have to ship it at your expense. I meant Mac Powerpc 8500 200 A/V. The details follows: 192mb of different memory and 2 slots left, 256K cache stick, Have RCA style A/V composite input and output with s-video ports, at least 2.1GB 7200rpm and other HD of unknown size but also 7200. 2X cdrom scsi. Cheers, Wizard

18 years, 3 months

Backing up VAX/VMS?

by ajp166＠bellatlantic.net

> >Subject: Re: Backing up VAX/VMS? > From: "Dave Dunfield" <dave06a at dunfield.com> > Date: Sat, 12 Jan 2008 21:26:39 -0500 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >> > My immediate concern is that I'd like to make a full backup >> > of the VMS 5.5 on the VLC, and also attempt restoring it to >> > another drive. > >> The VLC is simply SCSI based, isn't it? I wouldn't bother with doing a >> file-based backup, just because the SCSI drive will probably be "quite >> small" compared to today's drives. Just attach it to some other box >> and do a block-copy of the whole drive. That'll create a file of eg. >> 4GB in size with everything in it, including partitioning and all the >> file system(s). Simple to create, simple to restore to this or an >> identical drive. > >I've already done that - I put the drive from the VLC as an external >drive on the 3100 running NETBSD and dd'd it into an image file - but >my goal is to be able to survive a drive failure, and possibly also >move it to a larger drive. The original drive in question is an RZ23, >which is a 100M DEC labled Conner drive - I have three other similar >drives, two labled RZ23 and one Conner that are "really close" but >not exactly the same - apparently there were slightly different >variations and versions. > >> You'd probably do a file-based backup additionally to be able to >> restore to a different medium, though. > >Exactly. If I understand it correctly, an image backup should restore >to any drive, and is the best way to insure that I can rebuild the >system in the future. For VMS an image backup can build the disk again assuming it's as least as large as the source drive. I keep a RZ24 and a RD54 with VMS5.4 on it as a "installer". All I need to do is boot stabckup [standalone backup] and do an image copy of the drive to the target and now the target is a usable/bootable drive. Learned that trick at DEC as it was faster to carry a MFM or SCSI drive around to systems with VMS preinstalled but not personalized and run standalone backup. Time savings ran from hours down to 20 minutes. Beats the TK50 for time savings. >> > I found details of the keyboard and mouse protocol in the back of >> > a Microvax manual, and have been toying with the idea of building >> > a small embedded controller to take a PC (PS2) keyboard and mouse, >> > and emulate the DEC equivalents to the VAX - would anyone else be >> > interested in this? >> >> That's a nice little fun project, not too hard to implement. >> Personally, I do have real hardware (LK201/LK401 keyboard, VSXXX-AA >> and -GA mice and even a graphics tablet) that I use with my Linux box >> (with a simple adaptor to bring the MMJ11/Mini-DIN plug into the DE9 >> world, along with the Linux drivers for that hardware.) > >I have no idea how hard DEC keyboards and mice are to find, but PC/PS2 >devices are VERY plentiful, and I would imagine that there must be others >with VAXen and not the keyboard/mouse - If there's enough interest, >(or I don't find a mouse), I'll persue it further. Around here within 10 miles of the greater Maynard area or teh home of DEC they are pretty common. The keyboard would be easy to just take a PC based keyboard with 8051 and reprogram it and change the connector. The mouse is less common but usually easy to track down as they only work on DEC systems. What can be difficult is the various cables and adaptors to get from the box to whatever. Also PC DB/DP RS232 pinouts and conventions are NOT the same as DEC. If your playing with DEC look for a VT1200, thats and IP/LAT based (etherpipe Xterm) graphic terminal that also work with DECwindows. I tend to use that rather than fuss with multiple individual VAX systems. Since all my VAXen are on a Ethernet backbone that terminal allows for connection to any of them as charater mode or DECwindows. Anotehr beastie to look for is microVAX2000, sometimes thought to be the most useless vax for speed and space. However it can format any MFM drive to DEC RQDX3 format (PC cannot) and also floppies either RX50 or RX33. With the right software it can bootload a VAXterm as an ethernet windows terminal. Oh and with an RD54 it can run VMS So long as it has at least 6mb and keep VMS below V5.5 for space on disk reasons. If it has more ram but only a tiny disk then MOP load (net boot) VMS from a host and use the local disk as either private storage or swap/page (or both). It's small, so preserve one. Allison

18 years, 3 months

CFX-40

by akitaishi＠gmail.com

Hi , I am looking for a CFX-40 watch and was wondering if you still have any more Mint ones or new ones to sell ? I recalled your msg from a yahoo search but i reckon that it must be some time back. Regards, Jason

18 years, 3 months

Mac 8100/200 is now suplus. Now Questions.

by jpero＠sympatico.ca

Just a moment and sorry that tube making didn't go to right emailng list but it was worth looking as this skill was the BASIS of making early tubes back then, in fact, hardly haven't changed at all and much of the refining went into increasing and making tube more sensitive and responsive. Now that is put aside... about the Mac that I no longer need anymore and sitting gathering dust. I tried to look around on ebay to see how much value on 8100/200 and google. no luck. Is anyone could take this Mac or in pieces? Have to ship. It's kind of upgraded in many areas: 2 HDs I think one is 2.1GB and other one unknown but i know both are 7200rpm (have to check) running OS 7.5 or something for speed. 192MB total of totally mixed memory, leaving 2 slots left and 256K cache stick. HPV video card 1MB with spare memory waiting to be filled up. CD 2X scsi as well. Been few years since I last used it, it's clean and running. Cheers, Wizard

18 years, 3 months

H.P. VECTRA 286 / 12 battery

by RLAAG＠PACBELL.NET

I have a H.P. VECTRA 286 / 12 computer and seems to be loosing the battery... Is there any way to find the part number and is there any place to get one??? bob... RLAAG at PACBELL.NET

18 years, 3 months

Tandberg 3820 wanted

by spectre＠floodgap.com

Anyone out there with a Tandberg 3800-series tape drive (TDC 3820 preferred) they'd be willing to sell? It needs to be firmware revision -07:01 or better (not = ... there's a difference). The PROM version should be printed on the back label under the manufacturing date, or you can open the top cover (T-10 screws) and read the label off the PROM sitting in the "cage". Let me know off list. -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- The most valuable antiques are old friends. --------------------------------

18 years, 3 months

Backing up VAX/VMS?

by ajp166＠bellatlantic.net

> >Subject: Backing up VAX/VMS? > From: "Dave Dunfield" <dave06a at dunfield.com> > Date: Sat, 12 Jan 2008 20:27:53 -0500 > To: cctalk at classiccmp.org > >Hi Guys, > >Recently acquired some VAXen - I have a soft spot in my heart >for VAX/VMS as I worked professionally as a user on a VAX/VMS >system for quite some years, however I have little to no >experience from a system administration standpoint. > >What I have: > >VAXstation 3100, currently running NETBSD >VAXserver 3100 - Installed hobby version of OPENvms on it. >VAXstation 4000 VLC - Has a full VMS 5.5 installed on it. >Datability VCP300 16-port LAT terminal server (The VLC >appears to load LAT networking when it boots, but I haven't >looked into it further yet) > >My immediate concern is that I'd like to make a full backup >of the VMS 5.5 on the VLC, and also attempt restoring it to >another drive. Not quite sure what the best way to go about >this is, and I want to make sure I *DON'T* cause any damage >to it in the process, so I'm looking for someone experienced >in VMS who can give be a bit of advice/guidance. > >I've got some documentation that I've dug up on the web >including a VMS administrators guide, and I also have the >full VMS 4.0 documentation set (about 3-feet of paper!). > >I've seen reference to booting stand-along BACKUP - I do have >the OPENvms install CD which appears to boot to a configuration >which can do stand-alone BACKUP (at least it can restore from a >backup image on the CD). > >Possible backup media that I have available: > - A pair of Exabyte HH-CTS 8mm DAT tape drives > - A SONY SDT-5010 4mm DAT tape drive > - SCSI ZIP Drive > - Another SCSI hard drive > >Are any of these feasable as a backup medium for VAX/VMS? >(All three of these machines have SCSI ports) If so, any pointers >as to how to configure the drives/media to be recognized and >accessable to the stand-alone backup, and info on how to perform >such a backup would be most appreciated. I'll probably pull the >original drive and install OPENvms to another drive for a "test >run" before I try and backup the original system. > For VMS: Backup /image to another SCSI disk is easiest (I clone VMS systems that way). Or backup /image to a tape large enough to hold an entire disk. I have a sony (DEC TLZ04) 4mm DAT and backing up to a spare disk is easiest and the resulting disk is bootable should the first one fail. Also you can install a second or even third scsi disk and have a multiple boot system. Just set the console to not boot the existing disk. Then you can issue a "bo DUAn". For NonVMS OS such as NetBSD I think you need to refer to the unix realm and do a backup using TAR (it's been years). > >Related topic: Keyboard/Mouse emulator? > >So far most of what I've been doing has been via a serial console, >however both the 4000 VLC and the VAXstation 3100 support keyboard >and mouse - The VLC has a VGA video connector, and I've found a >couple of LCD monitors supporting sync-on-green which work on it. >I've also scrounged up an LK-201 keyboard which works, and I'm >working on acquiring a DEC mouse ... I did figure out how to activate >"dead rodent mode" which lets me do mouse movements through the >keyboard, and DEC windows does come up and run! > >I found details of the keyboard and mouse protocol in the back of >a Microvax manual, and have been toying with the idea of building >a small embedded controller to take a PC (PS2) keyboard and mouse, >and emulate the DEC equivalents to the VAX - would anyone else be >interested in this? I have real DEC Hawley mice and use them with a VT1200 Xterm. Allison >Regards, >Dave > >-- >dave06a (at) Dave Dunfield >dunfield (dot) Firmware development services & tools: www.dunfield.com >com Collector of vintage computing equipment: > http://www.classiccmp.org/dunfield/index.html

18 years, 3 months

Creating new CP/M disks - Progress on IMSAI

by ajp166＠bellatlantic.net

> >Subject: Re: Creating new CP/M disks - Progress on IMSAI > From: M H Stein <dm561 at torfree.net> > Date: Sat, 12 Jan 2008 14:37:42 -0500 > To: "'cctalk at classiccmp.org'" <cctalk at classiccmp.org> > >-------------Original Message: >Date: Sat, 12 Jan 2008 09:37:06 -0800 >From: "Chuck Guzis" <cclist at sydex.com> >Subject: Re: Creating new CP/M disks - Progress on IMSAI > >> Date: Fri, 11 Jan 2008 23:50:27 -0500 >> From: "Richard A. Cini" <rcini at optonline.net> > >> Anyway, one of the issues I have with the Teac FD-55GFR (1.2mb >> high-density; no schematic) drives Im using is that the motor runs all of >> the time (just like an 8 drive) but these late-model Teac drives dont >> have head relays, so the heads are engaged all of the time. > >Since the 8272/765 does drive "polling", you have to connect DRIVE >SELECT/ to DRIVE SELECT/. Connecting it to MOTOR ON/ would likely >have some odd effects. Recall also, that the 765 can do overlapped >seeks on multiple drives, which requires that the DRIVE SELECT/ line >be what it says it is. > >Which leaves you with connecting HEAD LOAD/ to MOTOR ON/; not a good >solution if you do a lot of multiple-drive operation (as CP/M floppy >systems are wont to do). Better would be to use a timer to monitor >the HEAD LOAD/ line and keep MOTOR ON/ active for a minute or so >after the last drive activity. A (or a couple) of NE555's should do >the trick. > >Recall that with the 55GFR, as the drive will not gate INDEX/ pulses >until it's determined that the diskette's come up to speed. (This, >BTW, is why hard-sector diskettes don't work in a 55GFR). So if >you'r getting INDEX/ pulses, the drive, by definition, is ready. Really, I'll have to tell my NS* it doesnt work.. mine seems to like it. >That's not to say that you couldn't get a GFR with a head-load >solenoid, but they're pretty uncommon. > >My take anyway. Never seen one with it and I've seen and have at elast five differnt versions including one with a door lock. Allison > >Cheers, >Chuck > >----------------Reply: > >That was going to be my last-ditch suggestion for the TEAC, putting a >one-shot delay on the /MOTOR ON line (Chuck, you know how I love 555s ;-). > >That delay on the 55GFR is not only a problem with hard-sector diskettes; >when I went through this exercise replacing 8" drives on my Cromemcos >(soft-sector), the GFR didn't work because the /DS -> /READY delay was >too long, even with the motor spinning. Tying /READY to ground made it >work and I suppose one could tie /READY to /DS with a diode if one >had no other drives available. > >Interestingly, Andrew Lynch apparently got a different version of the GFR >(-149 IIRC) to work on his Vector with HS disks, whereas my -159 never >goes ready at all with HS disks. > >The YE YD-380 does have a HL solenoid but AFAIK it's not separately >controllable; there's a pair of jumpers (HM & HS) that select whether >the head loads on /MOTOR ON or /DS. Nevertheless, it's probably >the closest to an 8" drive with a HL solenoid and constantly running >motor. > >One thing I've learned from trying to use 1.2Mb HD drives in anything >other than an AT is that among the dozen or so drives I tested there's >almost no consistency at all as far as jumper options and labelling, >/READY and /INDEX logic, etc. are concerned, even with different >versions of the same make and model. > >One of the most adaptable drive in my limited experience has actually >been the Panasonic JU-475 FWIW. > >mike >

18 years, 3 months

Creating new CP/M disks - Progress on IMSAI

by rcini＠optonline.net

All: I?ve been busy lately rebuilding the floppy system on my IMSAI. I scrapped the Frugal Floppy 8? in favor of a CompuPro Disk 1 using 5.25? disks to emulate 8?. This has been a long running project, but with the assistance from someone on comp.os.cpm who went through the exact same process with nearly the same hardware, I?ve been able to create a brand new CP/M 2.2 master disk. Yeah! Anyway, one of the issues I have with the Teac FD-55GFR (1.2mb high-density; no schematic) drives I?m using is that the motor runs all of the time (just like an 8? drive) but these late-model Teac drives don?t have head relays, so the heads are engaged all of the time. I?m looking for some advice/whatever on engaging the motor when needed. The Disk 1 is based on an 8272 controller chip and it has a HDL (head_load) signal which, through jumpers can be made to appear on the *MOTOR signal pin of the standard IBM floppy disk interface. I tested the HDL signal and it activates at the right time, so its following the 8? sequence, but the pulse width leads me to believe that it?s too short to let the motor spin-up and go ?ready?. There is a way to control this with software...and I may go that route anyway...but has anyone done this sort of thing ? used a 5.25? HD drive to simulate an 8? drive and if so, which drives did you use? Any input appreciated. Thanks. Rich -- Rich Cini Collector of Classic Computers Build Master and lead engineer, Altair32 Emulator http://www.altair32.com http://highgate.comm.sfu.ca/~rcini/classiccmp

18 years, 3 months

Creating new CP-M disks - Progress on IMSAI

by lynchaj＠yahoo.com

-------------Original Message: Date: Sat, 12 Jan 2008 09:37:06 -0800 From: "Chuck Guzis" <cclist at sydex.com <http://www.classiccmp.org/mailman/listinfo/cctalk> > Subject: Re: Creating new CP/M disks - Progress on IMSAI > Date: Fri, 11 Jan 2008 23:50:27 -0500 > From: "Richard A. Cini" <rcini at optonline.net <http://www.classiccmp.org/mailman/listinfo/cctalk> > > Anyway, one of the issues I have with the Teac FD-55GFR (1.2mb > high-density; no schematic) drives Im using is that the motor runs all of > the time (just like an 8 drive) but these late-model Teac drives dont > have head relays, so the heads are engaged all of the time. Since the 8272/765 does drive "polling", you have to connect DRIVE SELECT/ to DRIVE SELECT/. Connecting it to MOTOR ON/ would likely have some odd effects. Recall also, that the 765 can do overlapped seeks on multiple drives, which requires that the DRIVE SELECT/ line be what it says it is. Which leaves you with connecting HEAD LOAD/ to MOTOR ON/; not a good solution if you do a lot of multiple-drive operation (as CP/M floppy systems are wont to do). Better would be to use a timer to monitor the HEAD LOAD/ line and keep MOTOR ON/ active for a minute or so after the last drive activity. A (or a couple) of NE555's should do the trick. Recall that with the 55GFR, as the drive will not gate INDEX/ pulses until it's determined that the diskette's come up to speed. (This, BTW, is why hard-sector diskettes don't work in a 55GFR). So if you'r getting INDEX/ pulses, the drive, by definition, is ready. That's not to say that you couldn't get a GFR with a head-load solenoid, but they're pretty uncommon. My take anyway. Cheers, Chuck ----------------Reply: That was going to be my last-ditch suggestion for the TEAC, putting a one-shot delay on the /MOTOR ON line (Chuck, you know how I love 555s ;-). That delay on the 55GFR is not only a problem with hard-sector diskettes; when I went through this exercise replacing 8" drives on my Cromemcos (soft-sector), the GFR didn't work because the /DS -> /READY delay was too long, even with the motor spinning. Tying /READY to ground made it work and I suppose one could tie /READY to /DS with a diode if one had no other drives available. Interestingly, Andrew Lynch apparently got a different version of the GFR (-149 IIRC) to work on his Vector with HS disks, whereas my -159 never goes ready at all with HS disks. The YE YD-380 does have a HL solenoid but AFAIK it's not separately controllable; there's a pair of jumpers (HM & HS) that select whether the head loads on /MOTOR ON or /DS. Nevertheless, it's probably the closest to an 8" drive with a HL solenoid and constantly running motor. One thing I've learned from trying to use 1.2Mb HD drives in anything other than an AT is that among the dozen or so drives I tested there's almost no consistency at all as far as jumper options and labelling, /READY and /INDEX logic, etc. are concerned, even with different versions of the same make and model. One of the most adaptable drive in my limited experience has actually been the Panasonic JU-475 FWIW. mike -----REPLY----- Hi, Yes, I can attest to what Mike is saying regarding the TEAC FD-55GFR drives. I have gotten the TEAC FD-55GFR -149's, -193's, and -540's to work reading 16 sector hard sector media on my Vector Graphic with the VEDMCS. The frustrating thing is that the TEACs *almost* work perfectly. There still is a problem that if the motor turns off, sometimes I get a "BDOS error, drive not ready" message when accessing the drive. It seems the delay to read the drive is just a tad too short. Oddly enough, the VEDMCS doesn't even sense /READY pin 34 so it must be computing this value based on /INDEX or /READ or some other value. I think tying the /MOTOR line to ground might fix the problem but then the drives would be constantly spinning and I don't want that either. When I use the Panasonic JU-475-1, I don't have the problem. As a result, I am probably going to upgrade the Vector to the Panasonic JU-475 style drives since those are the only ones of several kinds I have tried that operate trouble free. Once you leave the AT standard, the HD drives vary a *lot* and there is no telling what will work short of just experimenting and testing. There are variations within brands and models, the jumpers have wildly varying meanings, if they are even there at all. Thanks! Andrew Lynch

18 years, 3 months

inexpensive prototype boards with 22/44 pin edge connector

by lynchaj＠yahoo.com

Hi, Does anyone know where to get some inexpensive prototype boards with the 22/44 pin edge connectors? I am looking for something like DATAK or VELLEMAN boards preferably under $10 a piece. I have looked but have not been able to find any. Any hints would be much appreciated. Thank you in advance! Andrew Lynch

18 years, 3 months

SEL -> Gould

by aek＠bitsavers.org

'82-ish http://www.paralogos.com/DeadSuper/Misc/Gould.html The Powernode was a 32 bit machine that had pretty decent I/O performance for the time. Some docs came along with the shipment from Germany (no machine though..) Have it scanned, will try to get it up on bitsavers.

18 years, 3 months

CROMEMCO: The "Cro'sNest" lives!

by rckuhmann＠charter.net

All: Re: CROMEMCO Looking for all manner of Cromemco (S100) items ...to buy or as contributions -- docs & manuals (paper or PDF), software & hardware. http://www.kuhmann.com/Cromemco/CrosNest.htm The above is my Silicon Valley memoir -- the long-time Sysop of the the "Cro'sNest RCPM-RBBS" 1977-1997 (formerly of Hayward CA & Sunnyvale CA, and France). Regards, Robert P.S. I have an implementation of MICAH CP/M 2.2 for the Z-2D (uses 16FDC). Seemed I saw someone was looking for that... P.P.S. My archives contain: S100, CP/M, CROMIX, Cromemo, uProcessor info, etc. -- all is on DVD's, e.g. (S100 2.0Gigs, Cromemco 4.3Gigs, CP/M 1.2Gigs, Vintage 3.54Gigs). Robert C. Kuhmann Delavan, WI USA

18 years, 3 months

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb