I?ve been struggling getting a 64k Dynamic RAM card back up and working in my IMSAI 8080. In fact I?m giving up on the DRAM card in this system and have decided to start looking for a SRAM card that can get the IMSAI up to 56k.
In terms if SRAM cards, I presently have:
2 x Problem solver RAM16 cards - both seem to be working.
2 x 8K RAM cards - both seem to be working.
Less cards generating heat, and putting stress on the old power supply is obviously best, so I?d be looking for either:
- 1 x 16k SRAM card (for a total of 4 RAM cards (3 x 16k + 1 x 8k) in my system). A PSS RAM16 would be preferred for sake of consistency, but obviously not crucial.
- 1 x 32k SRAM card (for a total of 3 RAM cards (1 x 32k, 1 x 16k + 1 x 8k) in my system)
- 1 x 64k SRAM card that can have the last 8k bank turned off
I would love to hear from anyone with one of the above cards who would be willing to pass it on.
Much thanks for your time.
----- Original Message -----
> Date: Sun, 22 May 2011 22:56:32 -0500
> From: Daniel Seagraves <dseagrav at lunar-tokyo.net>
> Subject: Re: Scraping DEC Equipment
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk at classiccmp.org>
> Message-ID: <C7A98127-DFF4-41B1-A6AF-5DFCA234D286 at lunar-tokyo.net>
> Content-Type: text/plain; charset=us-ascii
> I need a tractor feed assembly for a LA100, are the ones on the 120
Apparently not, but I might have one for an LA100.
I would like to get a Tek 4404 computer going but lack any service
manuals. The system turns on but has no curser on the screen. Has
good power from the Power supply and heater is on in the CRT.
Has a row of LEDs on the mother board. Does anyone know how
to read these.
- Thanks, Jerry
On 7 May 2010, at 08:25, cctalk-request at classiccmp.org wrote:
> Message: 2
> Date: Thu, 06 May 2010 16:06:37 -0700
> From: Al Kossow <aek at bitsavers.org>
> Subject: Re: Servant .953
> To: cctalk at classiccmp.org
> Message-ID: <4BE34B7D.6060902 at bitsavers.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> On 5/6/10 2:23 PM, Fred Cisin wrote:
>>> Al Kossow wrote:
>>>> I am interviewing Andy Hertzfeld tomorrow, and had hoped to talk about
>>>> Servant, but I can't find a copy of it around anywhere tonight.
> A huge thank you to Nigel Williams who forwarded a working copy of .951 five
> minutes before Bill and Andy arrived. We spent an hour talking about MacPaint
> and Quickdraw (Apple has finally given CHM approval to make the sources available)
> then another hour on Alice, Dali Clock, Servant, Hypercard, and Magic Cap.
Could you please clarify, the QuickDraw source is available for what purpose? Could developers modify it any include it in heir commercial 64 bit Intel applications for instance?
Is the source Pascal, Assembler, C or something else?
Director of Microspot who has a Carbon application which compiles with over 10,000 warnings about deprecated QuickDraw calls.
The revival process of the 11/750 continues. The power supplies is working
good and then I started testing the actual machine. But that was not a very
smooth journey to success. I have in total at least three complete CPU
board sets and just after quite a lot of board swapping it got running (I
I had error like:
* Bright red error light
* No response at all on the console
* %C microverify error
* %O microverify error
* An hexdump prompt which non like above bot still not correct.
Finally I had the
%% which meant that it passed microverify.
Then I used the (second) RDM module (the first one had RAM error) to run
the DPM and MIC test which passed.
The I ran the "Hardcore VAX instruction test" / TU58#7 which also passed
BUT the Cache / TB diag, TU58#5, give me this:
@?ECKAL -- VAX 11/750 Cache/TB Diagnostic
I am running a BE-S198Q-DE tape image.
Anyone has a listing or description for the ECKAL diagnostic? Is there any
know incompatibilities with certain revisions of boards? Or known bugs?
The machine manage to boot the console tape so I get the BOOT58> prompt.
But I am not sure if that indicate that it is indeed working or not.
So, some help with the Cache/TB diagnostic would be very much appreciated.
When Multics was officially released as free software a couple of
years ago, there was a flurry of activity aimed at getting some sort
of emulator up and running to run it. Did anything ever come of that
or did folks just lose interest (or find out that the needed
GE/Honeywell hardware was too poorly-documented to write an emulator
> From: Johnny Billquist bqt at update.uu.se
> The per-device code are in separate PROMs that are used in both the
> 9301 and 9312. Those are the ones with the device code as constants in
> the beginning of memory space for the PROM, by the way.
As I mentioned, the M9301-YA, at least, does not have this code. (See the
listing.) Also, again on the M9301-YA, the various bootstraps, diagnostics,
and console, are scattered through both banks (ditto), so one can't just
replace a PROM or two to chance the supported devices; one would have to
replace the entire set of 4 PROMs.
> I hope you also are aware that both the M9301 and the M9312 have
> different boot roms for some machines. I know that the 11/70 use
> different roms with other tests than other PDP-11s, and I seem to
> remember that one or two others do as well. (The 11/60 keeps popping up
> in my brain...)
I have yet to investigate the M9312's in depth, but I did know there are quite
a few different versions of the M9301 (which amount to different ROMs: I know
there are two different etch revisions of the card itself, but I think they
are programming-wise identical). I don't know of any good list of the
variants, but here are the versions I know of (device codes abbreviated to
M9301-YA /04 and /34 OEM version; has basic diagnostics, console emulator,
boots from various devices (RK, RP, TC, TM, DL, PC, TA, RX),
supports auto-boot on power on, and also power-fail restart
M9301-YB /04 and /34 end user version; has basic diagnostics, console emulator,
boots from various devices (RK, RP, TC, TM, TA, RX, DL, PC,
RJS, RJP, TJU), also power-fail restart
M9301-YC /70 version; contains basic CPU, cache and memory diagnostics,
boots from various devices (TM, TC, RK, RP, RK06, RJS, RJP, TJU, RX)
M9301-YD All models; contains code to allow a terminal attached to the
machine to be a terminal on some other line; also has boot
code for RX and DDCMP
M9301-YE All models; has basic diagnostics, console emulator; boots
from low speed paper tape or DECnet; supports auto-boot on
power on, and also power-fail restart
M9301-YF All models (auto-start not available on /45, /50); has basic
diagnostics, console emulator, boots from various devices
(RK, RK06, RP, TC, TM, TA, RX, DL, PC, RJS, RJP, TJU)
supports auto-boot on power on, and also power-fail restart
M9301-YH /60 and /70 version; contains basic CPU, cache and memory diagnostics,
boots from various devices (TM, TC, RK, RP, RK06, RJS, RJP, TJU, RX, PC)
M9301-YH All models; has basic diagnostics, console emulator; boots
from DECnet, and various devices (RX, TU, DL, DMC), also
The -YA is the only one I have examined in detail.
Got a hard down situation and need to re-install/recreate the BBS system I
HDD makes swishy noises when shaken, haven't tried stirring yet.
I /guess/ a bootable MCA SCSI card would work too... ;)
I had the 160MB drive, but anything above 30 would work - i guess i'll just
have to use a SCSI Drive for the file storage area once i get an MCA SCSI
Gary G. Sparkes Jr.
Here's the opportunity to buy&save batches of DEC flip chip modules.
It must be several thousands, I estimate the total weight of the boxes
to over 100kg.
Most are "red" logic series, but other colors are there too.
Apparently they are plugged from different machine types, maybe even
PDP-10s or -12s.
Of course I'm greedy!
But while we have a PDP-12 and some DECtapes here, this amount is mostly
useless and will occupy much precious space until the end of my days.
So question: Is there any reasonable demand for flip chips in the community?
And more difficult: any hint about the price I can offer?
Thanks for your opinion,