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101090 discussions

PDP-8 _Introduction_to_Programming_ & _Programming_Languages_(Scanned) Covers Needed

by bobvines00＠gmail.com

Does anyone have DEC's PDP-8 _Introduction_to_Programming_, Editions 3 and/or 4 and/or the PDP-8 _Programming_Languages_ handbooks? If you're not willing to part with your copy, could you scan the front covers of these handbooks and tell me which Edition(s) they are from? I'm especially looking for the front cover that had the "format generator program" printed on it in the background. I'm also looking for DEC's PDP-8 _Programming_Languages_. If you are not willing to part with them, could you scan the front cover and tell me which Edition(s) it/they are from? Thanks, Bob

9 years, 6 months

MicroVax II

by dj.taylor4＠comcast.net

I just got a MicroVax II in the BA123 world box chassis. I has a TK50, RX50, RXDQ2, but no DEQNA. I'd like to get it running an OS. The DU disks don't work, but I have a couple of Qbus SCSI controllers that might come in handy. Can you use those SD to SCSI convertors in this type of configuration? Anyone have experience with this? What OS's can I use with this hardware? NetBSD? Are versions of VMS available? How do you get an OS onto this system?

9 years, 6 months

HP 2100A Restoration

by COURYHOUSE＠aol.com

yes we used to at computer exchange inc... we had a bunch of blank I/o boards with the i/o special chips traces on the corner of board we would populate that portion then built out the rest..... rest of board was like a prototype board I scored a stack of them at a san jose computer junk show one time. we have voice synth that would plug into ho using natl. digitaker chip set built onto one of these i/o proto boards.... they were all gold plated etc.... which I still have some... we do have the first talker we built though ... if you score some of these boards most of the startup of the project is taken care of! ed# _www.smecc.org_ (http://www.smecc.org) In a message dated 8/2/2016 2:10:16 P.M. US Mountain Standard Time, perlpowers at gmail.com writes: On another note, has anyone ever tried making their own I/O boards for any of the 2100 series computers? The closest I found was http://newton.freehostia.com/hp/ where he makes a paper tape emulator and disk interface. However both of those are designed to connect to an existing I/O board like the "microcircuit interface". I haven't seen anything yet on how to interface to the I/O bus, but then again there are thousands of pages of manuals still to browse through.

9 years, 6 months

RX02 Debugging

by COURYHOUSE＠aol.com

yea these are nasty sounding drives when they load! ---Ed# Re: You'll hear a serious "clunk" when they load. In a message dated 8/2/2016 10:49:06 P.M. US Mountain Standard Time, lbickley at bickleywest.com writes: On Tue, 02 Aug 2016 21:43:03 -0700 Kirk Davis <kirkbdavis at me.com> wrote: > Thanks for the suggestions. I?m in Sunnyvale, CA. > > I actually got the rx02 from another hobbyist that > used it with the 44 in 2008 so I suspect it is configured correctly. > The other drive doesn?t have a belt so I?m unable to test with it. > I?ve verified the cable direction. It?s a sweet 44 - super clean, > runs great and is like a tank. > > One of the problems is I don?t know normal behavior of the drive. The > motor is aways spinning for unit 0. When I try booting I don?t hear > the heads load or seek. I?m new to the 44 monitor commands & boot > process etc so I?m learning as I go. The motors always spin. The heads should engage whenever selected. You;ll hear a serious "clunk" when they load. If you're coming to the VCF this coming weekend, Bob Rosenblum and I will have a running RX02 attached to a PDP-8/M. You can hear all of it's "sounds" there. You'll also be able to play "Spacewar!" with our VC8/E and XY monitor, etc. BTW: Make sure you have the correct switch settings on the RX02 mainboard for your PDP-11... > I?m also making one of these to help isolate if it?s a > drive/cable/controller problem: > > http://www.torok.info/computing/pdp11/rx02/index.htm That looks like a cool project. Would like to see it when you've got it running!!! Lyle > > On Aug 2, 2016, at 3:24 PM, Paul Anderson <useddec at gmail.com> wrote: > > > > Hi KIrk, > > > > The H771 is a rock solid power supply. I never saw one go bad while > > in field service, but they are getting old. Checking the output > > voltage and ripple is not a bad idea. > > > > forgive me for asking, but where are you located? The RX02 had 4 > > different power hanesses for i20, 220, 50 hz and 60 hz. Also > > different belts amd pulleys. if any of this is wrong you cn see > > weird problems. A lot of RX02s and replacement drives were soul > > through brokers who never asked or were never told where the unit > > was going. if you aren'y useing 120/60 that would be my first > > thought. > > > > Is the problem the same when booting off either drive? Also check > > the switches and the resistors on the head cables. > > > > Good luck, Paul > > > Jerry Weiss wrote: > > > >If you haven?t already, check the cable seating, orientation and for > >bent pins. > > On the RX211 board J1 - TT is the location of the AC LO - Active > > Low signal. > > > > On Tue, Aug 2, 2016 at 4:06 PM, Kirk Davis <kirkbdavis at me.com> > > wrote: > >> I?m a noob using RX02?s but thought I?d run this past people that > >> may have debugged them in the past and see if they agree with what > >> I?m finding: > >> > >> I?m trying to get a RX02 + RX211 + 11/44 going. The RX02 appears > >> to power up OK (fan and motor spinning). I verified I have the DY > >> boot rom in the 44. Attempt booting from the console: > >> > >>>>> b dy > >> > >> S > >> 17777707 173436 > >> > >> Which halts in the DY boot rom. I look at the base RX211 register: > >> > >>>>> e 17777170 > >> 17777170 104040 > >> > >> From the manual this like the controller is present but the high > >> order bit is set indicating an error > >> > >> Looking at the status register; > >> > >>>>> e 17777172 > >> 17777172 000010 > >> > >> Bit 3 == RX AC LO - This bit is set by the interface to indicate a > >> power failure in the RX02 sub- system. > >> > >> So start looking at the RX02 power supply? > >> > >> > >> > -- 73 AF6WS Bickley Consulting West Inc. http://bickleywest.com "Black holes are where God is dividing by zero"

9 years, 6 months

Is MS-DOS, PC DOS and DR-DOS vintage enough to count?

by jnc＠mercury.lcs.mit.edu

> From: Chuck Guzis > I routinely use Win98SE for my DOS tasks--it boots into DOS quite > nicely if you edit the MSDOS.SYS file to say BootGUI=0. That's considerably more elegant than the way I use, to get my 98SE boxes to boot into DOS to start with (which I prefer, in case I want to do anything that requires Windows not to be running, e.g. disk repairs); I just re-named 'WIN.COM' to 'LOSE.COM'. So I get an error message grumbling that it can't find WIN.COM, and then it falls into DOS. Of course, my way, I do get the ineffable pleasure of saying "LOSE" to start Windows, every time I boot the machines. Never gets old. Noel

9 years, 6 months

Transitional Technology SCSI controller

by glen.slick＠gmail.com

On Aug 2, 2016 4:39 PM, "Glen Slick" <glen.slick at gmail.com> wrote: > > On Aug 2, 2016 4:31 PM, "Douglas Taylor" <dj.taylor4 at comcast.net> wrote: > > > > I have an S-Box Q-bus SCSI controller made by Transitional Technology, it is missing two socketed chips; the PROM and what I think is a static RAM chip, both 28 pins. Does anyone have the HEX file of the PROM? Does anyone know what the RAM chip is? I curious to take a shot and see if this thing works. > > > > The board doesn't have jumpers, is it hardwired to some CSR? Thanks. > > > > Doug > > > > I have a TTi QTS-30 which is TMSCP tape only. No MSCP disk support. If there are no jumpers (I don't have it front of me to check at the moment) then it must be soft configurable through the 10-pin serial port interface. > > Post a picture of your board or send me one direct and I'll see if it looks the same as my board. If it is I can dump the EPROM firmware in mine for you. Maybe two EPROMs for 16-bit wide firmware. Responding to my own previous post. First, it is a TTi QTS-3, not QTS-30. The plain dual wide version without the S-Box handles is the QTS-1. Second, I can confirm that the CSR address is configured through the 10-pin serial port. Last, there is a single firmware EPROM. The other 28-pin socket is an 8KB SRAM. A Fujitsu 8464A on one of my boards and an Inmos IMS1630P on the other. Any standard 8KB SRAM of same or better speed (didn't check the speed grade) would likely be fine.

9 years, 6 months

Tek 4025 and 4017 Terminal option 31 kit to give away

by rlloken＠telus.net

I was rooting through the drawers in the shop looking for some torx screwdrivers and I found a Tek 4025 option 31 field upgrade kit part # 18-0124-00. This is complete in its original beat up box and useful only on a Tektronix 4025 or 4027 graphics terminal and there are none of those anywhere near here. Option 31 is a character set upgrade kit and has a printed circuit board, two character set ROMs, a DOS 5-1/4 floppy disk containing who know what, and a ribbon cable. And instructions. In the box, but unrelated, is an NIB key for a keyboard Tek part # 260-1924-00 and a used key cap (from a 4025?) labelled ERASE. Anybody want it for the postage? It should be fairly cheap to mail. -- Richard Loken VE6BSV, Systems Programmer - VMS : "...underneath those Athabasca University : tuques we wear, our Athabasca, Alberta Canada : heads are naked!" ** rlloken at telus.net ** : - Arthur Black

9 years, 6 months

Transitional Technology SCSI controller

by dj.taylor4＠comcast.net

I have an S-Box Q-bus SCSI controller made by Transitional Technology, it is missing two socketed chips; the PROM and what I think is a static RAM chip, both 28 pins. Does anyone have the HEX file of the PROM? Does anyone know what the RAM chip is? I curious to take a shot and see if this thing works. The board doesn't have jumpers, is it hardwired to some CSR? Thanks. Doug

9 years, 6 months

Midwest Scientific Instruments 6800

by vintagecomputer＠bettercomputing.net

Thanks Chris.. yes I think you are correct. ?Here is a photo of it: http://s1381.photobucket.com/user/unclefalter/media/20160520_194139_zpswkjg… This is the CPU board. ?I'm wondering why it has four EPROMs, and what the two unmarked do. ?This is where I wish there were a manual.. or even a good pic of an untouched original board to compare. http://s1381.photobucket.com/user/unclefalter/media/20160520_194018_zps8odx… I'd just settle for being able to fool around in the monitor. ?But I think this monitor is called WEEBUG because it's very stripped down. Sent from my Samsung device -------- Original message -------- From: Chris Elmquist <chrise at pobox.com> Date: 2016-08-01 8:14 PM (GMT-08:00) To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>, Brad H <vintagecomputer at bettercomputing.net> Subject: Re: Midwest Scientific Instruments 6800 I have all kinds of SWTPC 6800 stuff here and I think I recognize your floppy controller as a PERCOM LFD-400 board.? These are somewhat unique because they are built around a sync USART (S2650) and use 10-hole hard-sector floppy media (just like Heath H17 and Northstar systems). Can you see any PERCOM logo on the floppy controller board? Are there two 2708 EPROM on that board? Chris On August 1, 2016 12:32:49 PM CDT, Brad H <vintagecomputer at bettercomputing.net> wrote: >Just thought I'd send out another shout out to anyone who might have >one of these or is familiar with them. ?I've had this a while but have >not really been able to use it, lacking a boot disk. ?It also doesn't >have the standard MSIBUG ROM. ?I'm hoping maybe someone out there knows >how I could procure the original ROMs and put this back to stock. >I made a video showing the current 'WEEBUG' ROM in case any are curious >or someone out there knows about it. >Thanks! >https://youtu.be/LY7yoAVxSrM > > > >Sent from my Samsung device -- Chris Elmquist

9 years, 6 months

Pictures per previous post

by dfields-cctalk＠dpf.cc

You can view my shared album on the web: Classic Computers Apparently I can do this easily through iCloud. The joy of modern computers. :) Cheers, Doug -- Sent from my iPhone

9 years, 6 months

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