[cctalk] Re: Qume 842 8" Disk Drive Question

The drive works perfectly for double sided disks (using the appropriate index hole). Yea, 8" drives are a bit funny like that. You know this, because context. Some future google-ologist might not. So. 8" drives have a different index position for SS and DS. In your case I suspect either

[cctalk] Re: VCF SoCal

I have found that computers are much like motorcycles: many of the most interesting were never available in the US. Computers are much like motorcycles: many of the most interesting ones were TERRIBLE! W

[cctalk] Re: Vmebus

Anyone have a VMEbus system they use at least occasionally? If so, what make/model/config? I still use a couple of PPC VME boards (DY4 / Curtiss Wright 182/183/184, both Conduction-Cooled and Air-Cooled) to test the tail end of hardware that we are still shipping (by now EOL and basically

[cctalk] Re: Computhink Eagle 32 - software, docs, info?

Hi all Oops that went off before I was finished with it. I suspect that I can figure out from the pattern of I/O accesses which devices are at which address in the memory map, at least if I bring up an emulation in MAME. That should at least allow writing new code for it, and _maybe_ even

[cctalk] Re: Computhink Eagle 32 - software, docs, info?

Hi all Chris gave me a copy of the boot ROM and I played around with it a bit. I threw the 4KB of boot ROM in Ghidra and confirmed a couple things: - At boot, ROM is mapped to 0, and then remapped either by a write to the location or by a cycle counter: The initial stack pointer at 0x0 is

[cctalk] Re: Computhink Eagle 32 - software, docs, info?

Hi Chris and all - No video board, whether text or graphics Since there’s no video board in the system, and a couple of cables internally that aren’t attached to anything, I expect it was removed by a previous caretaker. This is sad because without one it’s unlikely to come up, not

[cctalk] Re: Microcom S-64 8085 system

Hi Tony and all It might have run CP/M (which will run on an 8080, and therefore on an 8085). That needs RAM at location [1]. I know of CP/M, I even used CP/M (on my Apple) but I did not know it needs RAM at . That's kind of strange, since everything that ran CP/M (OK, everything

[cctalk] Microcom S-64 8085 system

Hi all I re-discovered some eurocards I found in a box at a swapmeet long ago. It looks like a complete 8085 system. Lots of RAM, 2K EPROM, I/O, FDC. The strange thing is that the EPROM is mapped at F800, the code in there looks like 8085 code, and looks like it wants to live at F800. And

[cctalk] Re: PT-68K

Hi all I get the digest so I lag. From: skogkatt...@yahoo.com It's a IBM PC form factor 68000 based project that was featured in Radio Electronics. Anyone remember it or even know what I'm talking about? It would be a fun prokect. Come on over to "List: " there are people still running

[cctalk] UK members: Mushroom Components

Hi all I have before obtained obsolete 8-bit chips from Paul at mushroom.co.uk. But now my emails are not answered and their phone also doesn't seem to work. Does anyone know what happened and whether they're still around, or whether someone else took over their stock? Thanks W

Re: Mystery chip SCM44506L

Very likely a semi custom or custom memory device, due to the prefix. Armed with that and the fact that pin 1 connects to the leadframe I figured maybe it's something like the 6830 Mikbug prom -- 0V on 1, 5V on 12, data on the left, address on the right. Tried reading it like that (for

Mystery chip SCM44506L

Hi all From a friend's estate I have a Motorola 24-pin 0.6" purple ceramic DIP. SCM44506L 7610 B Any idea what this can be? W

Re: Eudora email client source code released

For the last five years I've been working with Qualcomm and others to allow the Computer History Museum to release the source code of what was, in my opinion, the finest email client ever written: Eudora. It's finally done! Yay! Now someone can fix the bugs :-) (6.2 here. Massive archive of

TRS-80 bits

Hi all I have a TRS-80 Model 2000 B/W Graphics board and a TRS-80 Card Cage kit (upgrade model 12 to model 16B) Are either of these worth shipping from the antipodes to anyone? W

Re: Oki 3305 disk drives

Hi all OK, following up on my own post here. I have a couple of Oki 3305BU 1/3 height 5 1/4" drives. On startup the motor spins and the heads load, but the heads don't move. Also, my BIOS tells me I have a drive failure. On taking them apart for a bit of a lube I noticed they have EPROM

Oki 3305 disk drives

Hi all I have a couple of Oki 3305BU 1/3 height 5 1/4" drives. On startup the motor spins and the heads load, but the heads don't move. Also, my BIOS tells me I have a drive failure. On taking them apart for a bit of a lube I noticed they have EPROM 8748s inside. Could this be the problem,

bode.ee.ualberta.ca

Hi all Does anyone have a mirror of bode.ee.ualberta.ca or know where I can find one? Sheesh the internet's supposed to be a repository but stuff is disappearing off of it like there's a black hole somewhere. W

Re: Odd disk image format... .552?

Recently found some long-lost images of 5 1/4" floppies that were sent to me... 10-15 years ago. Here's one of them: http://www.corestore.org/RP06.552 Looks like a straight image for a 1.44 what we call "stiffy". The 522 is the version of RP06. Google leads me to

Re: Multitech MicroProfessor

Possibly a long shot since I think the MPF was only a UK/Europe thing but At least one made it to South Africa. But no, I have neither the expansion board nor the manual I'm afraid. W