Compupro progress / Console questions ?

Hi Guys, I've made some progress on the Compupro system. This is a Godbout/Compupro S-100 system with: 8086/87 CPU DISK1 Floppy Disk controller Interfacer4 I/O Disk2 and Selector Channel (for HD - not installed) The problem I first posted what that it would select the drive with no disk in the drive, but not with a diskette! I disassembled the boot ROM, and rebuilt it with some output to show what was reading from the FDC. I determined that it was aborting the READ command with a "Drive changed Ready State during command". I tested the SA-851 drives on a different machine, but it appears they are incompatible with or not jumpered correctly for the Compupro controller. I hooked up a more modern 8" drive, and now the system goes through the booting motions reliably. In doing my debug, I also confirmed that the console port on the Interfacer 4 is working correctly (thats what I used for the debug output). According to Compupro Docs, the Console port is USER 7 - I have setup the board to respond to users 4-7, which is the default setup requireed for the console shows in the Compupro docs. As noted above, I can select user7 and talk to the console correctly, which would suggest that this is all working correctly. The DISK1A docs say: Switch 3 position 1 should be ON to use the "System Support 1" as the console, and OFF to use an Interfacer 3 or 4, user 7 as the console. I have checked that this switch is OFF, and that the bit is actually not grounded. When I boot the system, I see the RTS+DTR lines come up on all three serial ports, however I never get any console output. Either the console configuration does not match tbe boot disk, or the system is crashing/hanging during startup. The disks I am using are original Compupro distribution disks (Can't make copies yet), labled: Serial# C86-272-1854 Version: CP/< 86 (P0 in handwriting) CP/M 86 1.1 SYSTEM MASTER Disk Number 1 Single Sided - 1024 B/S Serial# C86-0272-1854 Version: 1R CP/M 86 SYSTEM MASTER Disk Number 2 of 2 Single Sided - 1024 B/S Disk 1 appears to do nothing, however Disk 2 is obviously booting - it recalibrates, reads a bit, seeks out a bit and reads some more, then seeks way out to read a bit more and back to near Track 0 - or something like that. Part way though this the RTS+DTR lights come up on the serial ports. Does anyone have any ideas as to what could be going wrong? It looks like all of the hardware is working. Anyone got a known good CP/M 86 disk for Compupro with Inerfacer 4 as the console? Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html