Subject: Re: Compupro progress / Console questions ? From: Dave Dunfield <dave04a at dunfield.com> Date: Sun, 24 Jul 2005 21:24:53 -0400 To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Hi Allison, Tried forcing READY on the original SA-851's, and it still didn't boot. I immagine there must be some other jumpering issues. I'm leaving that for now, as I do have a drive working.

Yes, thats one of the possibilities - others are that it is hanging on some other part of the init, or simply crashing (bad RAM etc.) Yes, it is CP/M 86 as noted in my original message: I was hoping someone might recognize these disks and be able to tell me if they are setup for the Interfacer-4, or some other device - or perhaps someone has a known good boot disk for this config (86/87, Disk1A, Interfacer4)? I've had to put it away to get some other more pressing items on the bench, however when I get back to it, I am going to proceed as follows: I've been using an EPROM emulator to load my modified boot - this will also let me change the content of the boot ROM with power-on (while it is switched out of course). The boot rom provides 512 bytes at 00-FF - while it is enabled (out of reset) I can write all of memory, however I can read only the boot ROM - once I hit the enable, the boot-rom disappears and RAM appears. I plan to write a loader which will allow me to load a block of code into RAM at $0200, and to switch the ROM OFF and the RAM ON in the very last instruction of the 0000-01FF block - so it should transition to the code in RAM correctly. Boot the system normally, then load the loader into the boot-rom (via EPROM emulator), Reset should start loader. Send my 8086 monitor. Loader will put it in RAM and transition to it. Then I should be able to browse around the loaded memory image, and perhaps determine what type of console device it wants to communicate with. Main problem is: I don't know much about CP/M-86 - I do not have technical documentation or experience with it. With CP/M-80, it's fairly easy to find the console drivers by following addresses. I have no idea how to do this with CP/M-86 Can you give me any pointers to how to find the console I/O functions under CP/M-86? I do have CP/M-86 running on an APC that I Can experiement with - I will also check the APC docs to see if they contain any useful info. I also have a Rainbow and docs, however I do not know how similar it will be as I seem to recall that the CP/M it has is a special dual-processor version.