> From: Mattis Lind
> Thanks Noel for sorting this out.
Eh, de nada. But thank you.
>> I wonder if the ucode in the two versions is identical? The uROM chip
>> numbers should give it, (if they are the same on both versions, albeit
>> in different locations on the board), but I have yet to check. Does
>> anyone happen to know?
OK, so the situation here is pretty complicated. To start with / make things
worse, that CPU uses lots of PROMs. Lots and lots and lots and lots of PROMs.
For the data paths board (M7260), both major versions appear to contain the
same PROMs (going by the DEC part numbers), but the chip location (Exx)
numbers are all different.
For the control board (M7261), the C, E ('early' version) and F ('late'
version) etch revisions each contain mostly the same PROMs, but apparently
with slight differences between the sets of PROMs in each (as reflected in
different DEC part numbers). For details see:
to which I have just added all the gory details.
As to getting the contents of all of them dumped in machine-readable form -
>> on the earlier version (prints for that version are in the GT40 prints
It turns out that I have hard-copy prints for the "C" etch revision of the
M7261, which do not yet appear to be online; the GT40 prints have the "E"
I will scan the pages for that revision of the board, and put them up 'soon'.
(I'm not doing the whole print set, it's about 1" thick, and most of them are
for other things anyway, like MM11-L memory, etc.)
> From: Toby Thain
> To get closer I'd need better images of the panels.
Hi, I borrowed a DEC inlay from someone (a KA10 CPU bay) and scanned a chunk
of it (as much as I could fit into my A4 scanner :-) at 200 dpi:
I have a TC08 inlay, but it's currently being used in my QSIC display (until
we can get the RKV11-F/RPV11-D inlay done :-), and I didn't want to yank it
out. As far as I can tell, it's the same font on the two of them.
> the closest I know of off the top of my head is Akzidenz Grotesk.
The Akzidenz Grotesk Medium is indeed very, very close (other than the zero).
Do you happen to know if that font available for use in non-commercial
Since a few days, my EXORciser Development System is finally able to boot from floppy diskettes.
Previous attempts have shown that the Motorola EXORciser M68SFDC1 floppy disk board used has a special modified ROM version. This was probably written for an 8-inch drive, in which the Write protect and Direction signal were inverted.
For the sake of simplicity, I have used free inverter on the board to invert the signals accordingly.
After adjusting the PLL frequency, reads and writes from the card are now error-free. And all without FDC, only clever programming by Motorola software engineers in the early 76?
Originally, the EXORdisk system was a dual drive with two 8 "units. This I have replaced with a double drive of two 5.25 inch units. An Epson and a TEAC, which can be jumpered to 360 rpm. Luckily, 2HD floppy disks are easy to R&W.
I also got a GOTEK floppy emulator running, which I can boot from. Thanks to Roland Huisman, Bitsaver has some interesting floppy disks that convert to HFE format work perfectly. This format makes the Gotek drive most reliable.
Now to my question. The vintage computer forum at http://www.vcfed.org/forum/archive/index.php/t-44638.html mentioned some interesting manuals. Archive.org has some manuals, Bitsaver does not have manuals about the M6800 development system.
If someone already owns scanned manuals to the following list
M6800 Basic Interpreter Reference Manual
M6800 Macro Assembler reference Manual
M68SFDU Exordisk 11/111 Disk `Drive Unit Maintenance Manual
M6800 Exorciser 11 User's Guide
M6800 Exorciser User's Guide
MEX68PP1 PROM Programmer Module Supplement M6800 Exorciser User's Guide
I would welcome any feedback or questions
The famous Brigham Young University 3D graphics program, by Dr. Hank Christensen.
I am looking for the fortran source, it should be 7 files:
Any docs related too.
Thanks for letting me beg.
The past few years I?ve become fairly focused on a particular old 1999/2000 ww2 fps computer game. Of course playing it but I?m also on the development team for the game (EA has given up on it, but we still put out new releases, maps, patches, etc.). As a result of that, I pretty much live on Discord text/audio chat these days. If you send me an email I will eventually see it and may even respond heh. But if you send me anything on Discord I?m going to see it immediately. If any of you are on discord, I am ?Todesengel#9624?. Feel free to add me as a friend and that way you can get me usually immediately. I am not leaving the hobby, nor am I saying not to email me at the usual address. But a lot of you do talk to me semi-frequently and I?m just saying discord will get to me far quicker.
In addition, mostly as an exercise to see how to do it, I set up a ClassicCMP discord server. That Discord server is NOT meant to replace this list, nor should it be taken to signal any less commitment on my part to keeping this list running. They are fundamentally different things; Discord is great for real time text chat back and forth. There are also audio and video channels if people want to use that to talk verbally or via video. To get on that server, here is a semi-permanent invite: https://discord.gg/U8Skw5g Joining the server gets you to all the other folks who may join the classiccmp discord, not just me. Of course, that could be zero ? Like I said, I just did it as an exercise, and discord is how some of my family and friends stay in touch. But it is there if peeps want to use it.
I?d rather not turn this into a long debate of whether discord is good or bad or anything like that. I?m just saying it?s there, and it?s quicker to get ahold of me that way at times.
Palo Alto Fry?s closing <https://www.sfgate.com/bayarea/article/Bay-Area-locations-Frys-Electronics-…> . Sad, but not the end of an era ? apparently the loss of lease
I remember visiting an early Fry?s (first?) in Sunnyvale (541 Lakeside Dr?, near Oakmead and around the corner from Shugart Associates where I then worked). I marveled at the selection of steaks, diet cokes, resistors, capacitors, ICs, etc. They had partially converted a supermarket into an electronics store but I heard they at first kept the food to keep some cash flow. I think I bought steaks J The engineers and technicians at Shugart more than once ran over there to get breadboard parts.
I?m not familiar with U.S. law but didn?t Xerox ?own? the patent(s) to GUI
technology? Again to my knowledge Microsoft and Apple both ?appropriated?
and/or ?misapproriated?, depending on your point-of-view, this exact
technology! Does commercial-use, read profit, subsume legal rights
eventually in the U.S. and I suppose elsewhere in the capitalist world?
Given what has happened in the past 45 yrs. or so, and the almost equal
value of Microsoft and Apple(determined by the stock exchange), has the
marketplace prevailed? Have we the consumer benefited the most or more
accurately the 2 richest high-tech, transnational corporations?
Happy computing - and best wishes for a prosperous New Year for all.
I have my VAXmate in pieces at the moment because the PSU has failed. I am
still working on finding the fault there, although it seems to be the
crowbar circuit that is shutting it down. To work out the problem I am going
to buy a DSO (Rigol DS1054Z) as my regular scope is analog and not much use
in detecting one-off events. It is an odd fault because there was a definite
bad smell after the failure, but I can't find any blown components. Whatever
blew up has presumably taken something on the PSU board with it, but I don't
know what yet. The PSU shuts down even with none of the other VAXmate boards
attached (and using a scratch HDD as a load).
Anyway, while I have the machine open, I thought I would look at the video
board capacitors too. Before the PSU failed, I noticed a bit of an
occasional wobble in the screen image and a narrowing of the image at the
top of the screen. I have measured ESR on all the electrolytics. All the
larger capacitors seem to have a low ESR compared to the table printed on my
ESR meter, some of the small ones (15uF/16V sort of size) have an ESR closer
to the values printed on my ESR meter. I don't really want to replace
everything if I don't have to, but equally I don't want any kind of failure
to ruin an irreplaceable component like the transformer. Should I just
re-cap the lot, or just the physically smaller capacitors?