test-drb March 2011

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cctech Digest, Vol 91, Issue 3

by bdamer＠digitalspace.com

Re: Giant Mac collection available... Good idea Evan, thanks! b

13 years, 9 months

PDP-11 on FGPA (was Re: MFM to IDE was RE SCSI -1 to IDE and SD project)

by ethan.dicks＠gmail.com

On Wed, Mar 2, 2011 at 3:10 AM, Rod Smallwood <rodsmallwood at btconnect.com> wrote: > How about a whole PDP11 including the IDE interface? Sounds fun to me. > http://www.heeltoe.com/download/pdp11/README.html That's a fun little project. Looking at the size of it, a little 2.5" IDE drive (or CF) would go well with it - small enough to make a native 16-bit portable (one of my long-term frivolous projects is marrying a wee dumb terminal to a wee PDP-8 or PDP-11 for a laptop-sized environment - easier to load into the car than the real thing. The SBC6120+IOB6120 is a good core for one version of that, this could be another, using a Spare Time Gizmos VT-4 or similar). -ethan

13 years, 9 months

My posts

by a50mhzham＠gmail.com

I believe I've sent two posts to the list this week. I haven't seen them, nor has anyone replied or cited them. (Blows across microphone) Is this thing on? 29 . [Philosphy] "For every complex question, there is a simple answer--and it's wrong." --H.L. Mencken NEW: a50mhzham at gmail.com ? N9QQB (amateur radio) "HEY YOU" (loud shouting) ? Second Tops (Set Dancing) ? FIND ME ON FACEBOOK 43? 7' 17.2" N by 88? 6' 28.9" W ? Elevation 815' ? Grid Square EN53wc LAN/Telecom Analyst ? Open-source Dude ? Musician ? Registered Linux User 385531

13 years, 9 months

WTD: 8-inch floppy drive

by nico＠Farumdata.dk

---------- Original Message ---------------------------------- From: Al Kossow <aek at bitsavers.org> Reply-To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Date: Wed, 02 Mar 2011 10:56:28 -0800 >On 3/2/11 10:10 AM, nico wrote: > >> What is a typical sales price for a functioning 8" drive? > >How much would it cost to get one to Philip from where you are? > >I'll cover the cost up to $100 total. > Just checked the going mail rates. If the weight is up to 5 kilo, a package will cost $ 55. They take $ 5 for an extra kilo. For an extra 18$, I can send 10 kilo. The heavier, the "cheaper" Would it be an idea with 2 drives, as the second would be almost for free, postage wise. If I send only 1 drive, I will in effect sell it for 45$, which is a but cheap BTW, I still have the diagrams for the Qualstar 3412S you asked about years ago. Still interested? Nico

13 years, 9 months

WTD: 8-inch floppy drive

by classiccmp＠philpem.me.uk

Hi guys, I'm trying to track down an 8-inch floppy drive to read an Intel MDS M2FM disc I've been sent for adding to the DiscFerret decoder engine. Specifically: it's an ISIS boot floppy, in SS/DD format. Does anyone have a spare 8in drive gathering dust in a corner somewhere? Based on the prices on Greed-Bay, I get the impression most of the sellers have been engaging in some form of abuse of illicit substances.... I mean, seriously, $700 for a Shugart 801, "untested" (which would seem to be a synonym for "I know it's broken but I sure as hell won't admit it!") and missing the head-amp / motor control PCB? Thanks, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

13 years, 9 months

WTD: MCM6206 RAMs

by classiccmp＠philpem.me.uk

This just keeps getting better. It seems the failed EEPROM chip in my logic analyser left a parting gift: it spiked the D4 and A9 lines on its way out. In other words, it's killed half a dozen bus transceivers (74F244 and 74F245), and probably the two MCM6206 high-speed RAMs as well... Does anyone have any Motorola MCM6206 series parts to hand, preferably in the J-lead surface-mount package? The parts installed now are MCM6206DJ35, but other (faster) speed grades should be fine too. I need at least two of these, but preferably four or five so I've got spares for future use... Thanks, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

13 years, 9 months

WTD: 8-inch floppy drive

by dm561＠torfree.net

> Date: Tue, 01 Mar 2011 14:50:19 -0800 > From: Geoffrey Reed <geoffr at zipcon.net> > Subject: Re: WTD: 8-inch floppy drive > > IIRC the tandon TM-848-2 drives use 24VDC motors... I always liked them > better than the shugart drives. > Me too! Note that the earlier TM-848s used a belt drive, whereas the 848-2 is direct drive (all 24VDC of course). m

13 years, 9 months

HP 9000 series 200 emulator

by Wayne.Smith＠warnerbros.com

Truly astounding work - thanks for doing this and for sharing it. Wayne Date: Wed, 2 Mar 2011 13:17:19 +0100 From: Olivier De Smet <olivier.2.smet at gmail.com> Subject: HP 9000 series 200 emulator To: cctalk at classiccmp.org Message-ID: <AANLkTikqDgzuhHVPdk6HZWRczuHt28_QJzPjNu1U7+qH at mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Hi, I have seen recently some 'request' for an hp 9000 serie 200 emulator .... here it is : http://sites.google.com/site/olivier2smet2/hp_projects/hp98x6 Olivier

13 years, 9 months

MFM to IDE was RE SCSI -1 to IDE and SD project

by lynchaj＠yahoo.com

Hi Ian, please note I said 'feasible'. Given enough effort and money I am confident that it is possible to build an MFM to IDE adapter. However, I do not think it is feasible as a hobbyist project. I may be wrong and maybe someone will produce such a device. I look forward to seeing it if and when it happens. Thanks and have a nice day! Andrew Lynch MFM to IDE was: RE: SCSI -1 to IDE and SD project Mr Ian Primus ian_primus <mailto:cctalk%40classiccmp.org?Subject=Re%3A%20MFM%20to%20IDE%20was%3A%20RE %3A%20SCSI%20-1%20to%20IDE%20and%20SD%20project&In-Reply-To=%3C511826.97503. qm%40web121606.mail.ne1.yahoo.com%3E> at yahoo.com Mon Feb 28 15:05:22 CST 2011 * Previous message: SCSI -1 to IDE and SD project <http://classiccmp.org/pipermail/cctalk/2011-February/297444.html> * Next message: MFM to IDE was: RE: SCSI -1 to IDE and <http://classiccmp.org/pipermail/cctalk/2011-February/297447.html> SD project * Messages sorted by: [ date ] <http://classiccmp.org/pipermail/cctalk/2011-February/date.html#297445> [ thread ] <http://classiccmp.org/pipermail/cctalk/2011-February/thread.html#297445> [ <http://classiccmp.org/pipermail/cctalk/2011-February/subject.html#297445> subject ] [ author ] <http://classiccmp.org/pipermail/cctalk/2011-February/author.html#297445> _____ On the subject of disk interface converters, I do believe an MFM to IDE bridge to be possible. Philip Pemberton has already proven it's possible to interface an MFM type device to a modern microcontroller - albiet the other way around, with his DiskFerret project. The MFM interface is very different >from SCSI and IDE, true, but with modern microcontrollers, the data rate should be achievable. Sure, the MFM interface is primitive. You've got the analog-ish data stream >from the disk and some stepper motor drive signals, but you can translate those with a microcontroller, have it request the block from the IDE device, buffer it, and stream it out to the host. I think it's doable. Just, more complicated than, say, SCSI to IDE. SCSI to IDE is a great project, but at least, for me, I've got plenty of SCSI drives. In fact, I probably have more SCSI disks than IDE. MFM, not so much. -Ian _____ * Previous message: SCSI -1 to IDE and SD project <http://classiccmp.org/pipermail/cctalk/2011-February/297444.html> * Next message: MFM to IDE was: RE: SCSI -1 to IDE and <http://classiccmp.org/pipermail/cctalk/2011-February/297447.html> SD project * Messages sorted by: [ date ] <http://classiccmp.org/pipermail/cctalk/2011-February/date.html#297445> [ thread ] <http://classiccmp.org/pipermail/cctalk/2011-February/thread.html#297445> [ <http://classiccmp.org/pipermail/cctalk/2011-February/subject.html#297445> subject ] [ author ] <http://classiccmp.org/pipermail/cctalk/2011-February/author.html#297445> _____ More information <http://www.classiccmp.org/mailman/listinfo/cctalk> about the cctalk mailing list _____

13 years, 9 months

SCSI -1 to IDE and SD project

by lynchaj＠yahoo.com

Hi Rod, I do not think an MFM/RLL (ST506/ST412) to IDE bridge board is feasible. The SCSI-1 and IDE interfaces are purely digital and the drives are intelligent enough to abstract much of the realtime complexities of communicating with the hard drive itself. As a result the bridge board between the SCSI-1 and IDE is relatively simple and a basic Z80 embedded controller is able to accomplish the data transfer relatively easily. It is well suited for a community hobbyist project like the SCSI to IDE/SD bridge board we are working on at Vintage-Computer.com forums. MFM/RLL (ST506/ST412) interfaces are a high speed extension of the Shugart floppy drive interface with some additional signals. It is a hard realtime interface and low level way to communicate with the hard drive. As a result it would require an extremely sophisticated high speed controller to interpret the signals to and from the MFM/RLL (ST506/ST412). A simple Z80 or microcontroller based controller would not be able to accomplish the task in my opinion. It may be possible but I believe it would be an expensive commercial device and probably quite rare. The SCSI-1 to/from IDE/SD project is a hobbyist community project and I think would be quite helpful to the wide array of legacy/vintage/classic devices which use SCSI-1 drives. So far, I have heard from owners of the obvious microcomputers like Atari, Amiga, Apple Mac, Sun workstations, DEC, etc. However many other devices used SCSI-1 devices such as synthesizers, a variety of test and lab equipment (?), sewing machines (?), photocopiers (?), and other devices I would have never suspected used SCSI-1 drives. At the moment, there are 6 builders with the prototype PCBs but none have reported a working build yet. The parts are very common and the design uses only "hobbyist friendly" construction for easy assembly. However, the software still needs to be written which should be largely reuse of existing Z80 code from existing N8VEM projects. If you or anyone else is interested in working on the project please contact me. I still have 4 remaining prototype PCBs. My goal is to get this project up and running before the SCSI-1 drives become difficult to obtain such as 100 TPI floppy drives, MFM/RLL (ST506/ST412) hard drives, and other uncommon storage medias. All of the technical information on the project is available at the N8VEM wiki. It will be free/open and publicly posted for community benefit like the rest of the N8VEM boards. Please read the existing technical documentation before critiquing the design. http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder <http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder&param=MINI%20SCSI%20 to%20IDE%20prototypes> &param=MINI%20SCSI%20to%20IDE%20prototypes Thanks and have a nice day! Andrew Lynch SCSI -1 to IDE and SD project Rod Smallwood rodsmallwood at btconnect.com <mailto:cctalk%40classiccmp.org?Subject=Re%3A%20SCSI%20-1%20to%20IDE%20and%2 0SD%20project&In-Reply-To=%3C5177DAA49B624EFD819C07F9E41EFFA8%40RODSDEVSYSTE M%3E> Tue Feb 22 02:36:34 CST 2011 * Previous message: GSX <http://classiccmp.org/pipermail/cctalk/2011-February/297266.html> porting project * Next message: SCSI -1 to <http://classiccmp.org/pipermail/cctalk/2011-February/297278.html> IDE and SD project * Messages sorted by: [ date ] <http://classiccmp.org/pipermail/cctalk/2011-February/date.html#297263> [ <http://classiccmp.org/pipermail/cctalk/2011-February/thread.html#297263> thread ] [ subject ] <http://classiccmp.org/pipermail/cctalk/2011-February/subject.html#297263> [ author ] <http://classiccmp.org/pipermail/cctalk/2011-February/author.html#297263> _____ Hi This looks interesting. As collector of DEC systems my need is slightly different insofar as due to the rapid disappearance of ST506 (MFM) drives I need to make say an IDE drive look like a an ST506 drive to a DEC MFM controller. Whilst your SCSI to IDE is nice I'm not short of SCSI drives. However with your experience you might like to comment on if you think a DEC MFM controller to IDE drive converter box is feasible. Regards Rod Smallwood -----Original Message----- From: cctech-bounces at classiccmp.org <http://www.classiccmp.org/mailman/listinfo/cctalk> [mailto:cctech-bounces at classiccmp.org <http://www.classiccmp.org/mailman/listinfo/cctalk> ] On Behalf Of Andrew Lynch Sent: 21 February 2011 14:39 To: cctalk at classiccmp.org <http://www.classiccmp.org/mailman/listinfo/cctalk> Subject: SCSI -1 to IDE and SD project Hi! Several weeks ago there was a discussion on CCTALK about a free/open SCSI to IDE and SD project. I designed a PCB using the Z53C80 and a Z80 with RAM/ROM/UART/IDE and SD. There is a prototype available waiting for some interested builders to take on the project. As far as I know none of the builders have a completed unit although I think if we had at least one working unit the project would make some real progress. I have four remaining SCSI to IDE/SD prototype boards so if anyone would like to join the project as a software developer please let me know. I believe much of the software can be reused from previous N8VEM and/or other free/open software projects. http://n8vem-sbc.pbworks.com/w/page/35044530/PCB-Inventory Thanks and have a nice day! Andrew Lynch _____ size=2 width="100%" align=center> * Previous message: GSX <http://classiccmp.org/pipermail/cctalk/2011-February/297266.html> porting project * Next message: SCSI -1 to <http://classiccmp.org/pipermail/cctalk/2011-February/297278.html> IDE and SD project * Messages sorted by: [ date ] <http://classiccmp.org/pipermail/cctalk/2011-February/date.html#297263> [ thread ] <http://classiccmp.org/pipermail/cctalk/2011-February/thread.html#297263> [ <http://classiccmp.org/pipermail/cctalk/2011-February/subject.html#297263> subject ] [ author ] <http://classiccmp.org/pipermail/cctalk/2011-February/author.html#297263> _____ More <http://www.classiccmp.org/mailman/listinfo/cctalk> information about the cctalk mailing list _____

13 years, 9 months

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test-drb March 2011