Xref: utzoo misc.wanted:11765 comp.sys.misc:3044 comp.os.cpm:4224 alt.folklore.computers:6411 Path: utzoo!utdoe!ontmoh!attcan!uunet!seismo!dimacs.rutgers.edu!rutgers!cs.utexas.edu!sdd.hp.com!wuarchive!mit-eddie!uw-beaver!zephyr.ens.tek.com!tektronix!nosun!techbook!fzsitvay From: fzsitvay@techbook.com (Frank Zsitvay) Newsgroups: misc.wanted,comp.sys.misc,comp.os.cpm,alt.folklore.computers Subject: Re: Need info for an S-100 bus system Message-ID: <1990Oct24.074148.23090@techbook.com> Date: 24 Oct 90 07:41:48 GMT References: <1990Oct19.204926.17576@techbook.com> Organization: TECHbooks of Beaverton Oregon - Public Access Unix Lines: 64 In article ianj@ijpc.UUCP (Ian Justman) writes: >fzsitvay@techbook.com (Frank Zsitvay) writes: > >> Not exactly. I tried using z80mu to write a zmd overlay. I could >> assemble it but the loader barfed under the emulator. > >What loader were you using? And does it say what calls it puked >on? > i was using cp/m load.com. and the function was number 26, set DMA address. >> Z80MU does >> not support such things as setting the DMA address for cp/m, among >> other things. > >What do you expect for an emulator? It probably could be done >but I dunno... > what do i expect from an emulator?? an emulation that works. granted it is free software (virtually) so i can't beef much, but all the DMA address in cp/m does is tell the operating system where the next disk operating is supposed to read/load the data from/to. this is used quite a bit in some utilities. when loading a file for processing, the application reads in a disk block, increments the DMA address by 128, and reads the next one, and so on. it's a bit faster than doing a read/block move approach. as far as emulating a z80, it does a good job. emulating cp/m is another story. And now for something completely different... I have a california computer systems s100 machine that i am trying to get back into working order. it has three boards, a model 2810 Z80 cpu, a model 2065 64k RAM board, and a model 2422 Disk controller board. My problem is: What is the power-on jump address supposed to be set at so the coldstart rom will be executed?? when i got the board it was set at 0000H, which didn't work. I have no documentation with this machine, so i don't want to resort to the trial and error method, checking all 65536 addresses, although by educated guesses it could be narrowed down to 512 or so. Also, if anyone else out there has a machine like this one, would i be able to get a copy of the boot disk?? i have a bios listing for this system, but don't want to go through the hassle of building cp/m onto a floppy, and also the only machine i have here (with 8 inch drives) is a tandy model 12, which has an ersatz cp/m implementation. (doesn't support movcpm and sysgen, which are a necessity for this type of port.) and another request... i also have a kaypro 2 (1983), and i need a boot disk for it. -- fzsitvay@techbook.COM - but don't quote me on that.... American Oil Company motto - Bend over, We'll pump!!!