Service manual for IBM PS/2 Monochrome Display?

(Note: Also posted to VCF) Hi Guys, It's a long shot but I’m searching for a manual, which hopefully someone has scanned somewhere. In my latest “check-my-gear-works” audit, an IBM PS/2 monitor failed. It worked initially although brightness and contrast needed to be almost fully up to see

Re: DCC-116 E / DATA GENERAL NOVA 2/10 / Nixdorf 620 - Restoring and restarting

Hi ! I finally find some time to work again on my D-116, try to find the problem(s), thus principally at the level of PSUs. As you suggested, I inspected particularly the large capacitors of both power supplies. I replaced those that appeared suspicious according to the results via my ESR

Re: 3.5" 1.44mb floppy disk block diagram/schematics

On 08/16/2017 11:33 AM, Al Kossow via cctalk wrote: > > > On 8/16/17 11:20 AM, Tony Duell via cctalk wrote: > >> But I am not so sure about AGC. I've looked at the schematics for >> some 5.25" drives and I can find no AGC circuits. Nor on the Sony >> 3.5" full-height 600rpm drives. So I would

Re: DECstation 220. Another Impasse

Hi Rob, I've seen lots of PLCC packages soldered directly to the board. Many BIOS chips were socketed, presumably because they were the last to get inserted unto a motherboard as BIOS firmware updates were issued during manufacturing. Removal won't be easy but you could either: - Slip a

Re: DECstation 220. Another Impasse

On Wed, Aug 16, 2017 at 7:10 PM, Rob Jarratt via cctalk wrote: > I suppose that, happily, it looks possible to procure replacements for this > chip. I am slightly puzzled by the packaging of this chip though. It is > surface mounted on my CPU board, but the packages

Re: 3.5" 1.44mb floppy disk block diagram/schematics

On 8/16/17 11:20 AM, Tony Duell via cctalk wrote: > But I am not so sure about AGC. I've looked at the schematics for > some 5.25" drives and I can find no AGC circuits. Nor on the Sony > 3.5" full-height 600rpm drives. So I would not be at all surprised if > there was no AGC on this Teac. I

Various Software and Documentation for shipping + donations (round 7)

All, More of the stack. if any of this interests you please contact me via Private (not list) email at mtap...@swri.edu. If you do want something, send me your shipping address and exactly what you want. I'll get back to you with estimated shipping costs (USPS media rate where

Re: 3.5" 1.44mb floppy disk block diagram/schematics

On Wed, Aug 16, 2017 at 7:12 PM, Chuck Guzis via cctalk wrote: > On 08/16/2017 10:40 AM, Tony Duell via cctalk wrote: > >> >> I have just looked at it, and unfortunately it is of no help with this >> question (I assume that if manuals for other versions of the FD235 >>

Re: 3.5" 1.44mb floppy disk block diagram/schematics

On 08/16/2017 10:40 AM, Tony Duell via cctalk wrote: > > I have just looked at it, and unfortunately it is of no help with this > question (I assume that if manuals for other versions of the FD235 > exist, they will be similar). Most of the manual is replacing mechanical > parts, doing the head

RE: DECstation 220. Another Impasse

> I was out most of this evening, but I just had a quick look again and think I have > found something significant. Comparing the gate array pins on the two boards I > have, I see that on the board where the video is corrupted, there are two pins > that appear connected to 0V that are not

Re: 3.5" 1.44mb floppy disk block diagram/schematics

On Wed, Aug 16, 2017 at 6:28 PM, Al Kossow via cctalk wrote: > I was looking at this thread > https://forum.kryoflux.com/viewtopic.php?f=3=749 > > And they mention the data they were looking at has AGC applied. > > I didn't know any floppies used AGC in their read channel

3.5" 1.44mb floppy disk block diagram/schematics

I was looking at this thread https://forum.kryoflux.com/viewtopic.php?f=3=749 And they mention the data they were looking at has AGC applied. I didn't know any floppies used AGC in their read channel and in particular I'm trying to find a block diagram or schematic of the logic in the Teac

Re: The Name of the disk (Was: Disk imaging with IMD - question

http://www.retrotechnology.com/herbs_stuff/drive.html is more detailed than the On 8/10/17 1:32 PM, Tom Gardner via cctalk wrote: > Me too - great rant.

Re: pdp-8/e restoration.

On 8/16/17 9:38 AM, Ethan Dicks wrote: On Tue, Aug 8, 2017 at 8:35 AM, allison via cctalk wrote: Note: TU58 (variant of DC100 tape) to my knowledge was never used with PDP-8 in any flavor. There is no reason why not other than no driver and it 8bit only and the

Re: Plotter + Tape drive

> > It is SCSI. > Hi Andy, In that case, I am interested too. I am on the East coast of Ireland. I don't suppose you make regular trips to North Wales or anything like that :-) Regards, Peter Coghlan.

Various Software and Documentation for shipping + donations (round 6)

All, More of the stack. if any of this interests you please contact me via Private (not list) email at mtap...@swri.edu. If you do want something, send me your shipping address and exactly what you want. I'll get back to you with estimated shipping costs (USPS media rate where

Re: pdp-8/e restoration.

On Tue, Aug 8, 2017 at 8:35 AM, allison via cctalk wrote: > Note: TU58 (variant of DC100 tape) to my knowledge was never used with PDP-8 > in any flavor. There is no reason why not other than no driver and it 8bit > only and the blocking is 512bytes. I remember a lot of

Re: Plotter + Tape drive

It is SCSI. You are one of two people interested both of whom have transport problems. I REALLY don't want to pack it for transport though there a few courier firms that could send it collecting from here (I'd probably put DPD as the most reliable that knows this location) If you're keen

Re: Plotter + Tape drive

Hi, HP 88780 9-track tape drive (also several tapes "new" in packaging). Both were working when last powered-on but that was a couple of years ago. If the drive is the SCSI version, I'd be VERY () much interested! I'm located in Germany. Must think how to get it here in case that I could

RE: DECstation 220. Another Impasse

I already did that, it looked "normal". But I will check it all again. For now I need to investigate the two pins on the gate array that appear connected to 0V on one board but not on the other. Regards Rob > -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On

RE: DECstation 220. Another Impasse

Hello Rob, please try to check the status of the OE input, comparing it to the other motherboard. Andrea