test-drb August 2021

test-drb@ccmp.vtda.org

122 participants
92 discussions

by charlesmorris800＠centurytel.net

On 8/13/21 7:00 PM, cctalk-request at classiccmp.org wrote: > Message: 1 > Date: Thu, 12 Aug 2021 13:10:43 -0400 > From: Ethan Dicks<ethan.dicks at gmail.com> > To: Al Kossow<aek at bitsavers.org>, "General Discussion: On-Topic and > Off-Topic Posts"<cctalk at classiccmp.org> > Subject: Re: ISO Laserjet I/II/III firmware > Message-ID: > <CAALmimnjndcx5G0mPoP7sPb-c+Aocibms_RfCDQFW7aA5bPs3A at mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > On Thu, Aug 12, 2021 at 10:48 AM Al Kossow via cctalk > <cctalk at classiccmp.org> wrote: >> I suspect interest in emulating them will die out once they get past the 68000 models. > I may still have a II, and I definitely still have at least one > (functional) III and a 4Si > > I still use my 4M/L all the time - Postscript + LocalTalk + IEEE1284. > It's a great little printer. > > -ethan I have a IIp+ that I got for $2 at a hamfest around 15 years ago... I have repaired it several times (most recently, visibly bad electrolytics in the switching PS startup circuit). In fact that's the second time the power supply has failed - the first time was years ago and I just replaced the board. Now it's crinkling the bottom of pages... there used to be a kit to fix that. I love those old "bricks". Although mine is like my grandfather's axe (new head and new handle but it's still my grandpa's axe) :) The trick nowadays is finding toner cartridges that weren't just refilled, but actually rebuilt (with a new wiper blade). -Charles

3 years, 4 months

Early '80s Motorola Semiconductor Reference - anyone?

by bear＠typewritten.org

Anyone have an early ?80s Motorola semiconductor reference manual? I am attempting to repair a Boschert power supply from ~1983 that is full of Motorola parts marked as 1027 (DO-42ish), 1077 (TO-3ish), 1078 (DO-5ish), etc. It would be extremely helpful to know their specifications, or ideally how to cross-ref them to ?standard? parts. ok bear.

3 years, 4 months

ISO Laserjet I/II/III firmware

by aek＠bitsavers.org

There has been some work going on emulating early Laserwriters in MAME and I was wondering if anyone still has boards or firmware dumps from Laserjets. It seems most have been scrapped. "nobody collects printers"

3 years, 4 months

howto bitsavers BASIC-11 v2 disk image under simh

by fritzm＠fritzm.org

Hi folks, Could anybody spare a clue or some suggestions on how to access the contents of: http://bitsavers.trailing-edge.com/bits/DEC/pdp11/floppyimages/rx02/BASIC-1… under simh? I haven't had any luck mounting the contained BASIC.DSK e.g. on simh RY under RT-11. Looking through a dump of the image, there seems to be an "RT11A" signature. Tried putr under dosbox as well, but it seems to hang mounting the image. Suggestions appreciated! --FritzM.

3 years, 4 months

DQ11 prints needed

by jnc＠mercury.lcs.mit.edu

> From: Jay Jaeger > BTW, I have only the sales brochure for the DM11, near as I can tell. > 114X-00871-1715/J . If you want me to drag the box of sales lit from > the garage, and scan it, me know - could do it next week. No major need for it; I found the DM11-AA Tech Manual in my PDP-11 fiche set. So I doubt the brochure would answer any of the remaining questions; we'd probably need the Engineering Drawings for that. But there's so little on the DM11, it might be interesting to see the brochure. The big issue with the TM is that it has the same erroneous diagram for i) the boards in the DM11-A, and ii) their locations in the backplane, as the one in DEC-11-HDMBA-A-D, "DM11-BB modem control option manual", on pg. 1-5. The diagram there lists: M7245 Transmitter E M7244 Transmitter D M7245 Receiver M7242 Control C M7241 Control B M7240 Control A So two 'M7245's, with different functions listed! And no M7243... The DEC "Spare Module Handbook" shows: M7243 "DM11 transmitter D" M7244 "DM11 transmitter E" M7245 "DM11 receiver" so the M7245 probably _is_ the receiver; but this list shows that the 'transmitter E' card is the M7244, not the M7243 (as would be if the top line >from the module diagram had a typo '5' for '3'. Hence my observation that it would probably take takethe ED tostraighten thins out. But as I said recently, no real need; the thing is a total canine, and I doubt very much that there are any left in the world. Noel

3 years, 4 months

MTI MXV22M

by glitch＠glitchwrks.com

Does anyone have experience running the MTI MXV22M? It's a dual-height QBus card that emulates RX02 but uses a 5.25" 96 TPI drive. I've got a small heap of them and we're trying to get them going. When trying to format diskettes using the process documented in the manual, the drive selects for maybe a second then deselects, and we get a drive not ready error. The controller isn't using the ready line, as the SA-460 for which it is designed doesn't supply it. No traces physically connect to pin 34. Since we're close to out of ideas, we've also plugged in a pair of Shugart SA-800s, on the idea that maybe the MXV22M is close enough to the MXV22 to show some signs of life. It doesn't give a drive not ready error, and it will step the heads like it's really formatting, but never loads the heads. Happy for any input on this one! Thanks, Jonathan

3 years, 4 months

CPU Tests

by david＠thecoolbears.org

My KA655 CPU is freezing during the power up sequence, after test number 04: KA655-B V5.3, VMB 2.7 Performing normal system tests. 40..39..38..37..36..35..34..33..32..31..30..29..28..27..26..25.. 24..23..22..21..20..19..18..17..16..15..14..13..12..11..10..09.. 08..07..06..05..04.. Any suggestions as to what might be wrong?

3 years, 4 months

Atari 800 to C64

by kl＠2k.ca

https://redd.it/p24fo8 Turns ur 800 in a c64. Cool

3 years, 4 months

Xerox 820/II 8/16 Prom/Eproms ( Masters ) on e-bay

by Mark＠Misty.com

Hi, I'm not prepared to lay out $200 for these Xerox ROMs, but if I do manage to get them, I'll read and share them. I did not know there were 5.0 ROMs for the 820-II, but it appears there were, and they are included. https://www.ebay.com/itm/184980603844 Mark -- Mark G. Thomas <Mark at Misty.com>, KC3DRE

3 years, 4 months

Xerox 820/II 8/16 Prom/Eproms ( Masters ) on e-bay

by Mark＠Misty.com

3 years, 4 months

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test-drb August 2021