UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Gemini 80-Bus System

JohnBHanson · 14th Sep 2019, 10:18 pm

I have to add (implement) READ ADDRESS command for the floppy disk controller. This returns the track/sector header.

Also changed controller type to 829 rather than 849. This seems to work although I would have
thought that the 849 would have been the better choice as it allows more floppy drives.

This is the latest config file. Note -o t on the command line enables tracing of IO

#verbose

cpuclock 4

if T board 0x0 intbus 0x0 0xff xrwt trace
if T bus trace

board 0xfe gm813_mmu

board 0xb0 gm832 Gemini green
board 0xb8 serial_8250 trace tty tty /dev/ttyS0

board 0xe0 gm829_scsi ~/beaver/disks/gem925.dsk
board 0xfb gm833 -maxtrack 0x3f
board 0xe0 gm829_floppy -geometry D35.2.10.0.512 &
~/beaver/gm512/GM512_ORIGINAL.DMP

if T bus io

binload cb00 ./beaver/network/cpm64w.bin

byte 0 c3 00 eb

PS - remember to download latest xbeaver.

14th Sep 2019, 10:18 pm	#213
JohnBHanson Heptode Join Date: Aug 2009 Location: Worthing, Sussex, UK. Posts: 661	Re: Gemini 80-Bus System I have to add (implement) READ ADDRESS command for the floppy disk controller. This returns the track/sector header. Also changed controller type to 829 rather than 849. This seems to work although I would have thought that the 849 would have been the better choice as it allows more floppy drives. This is the latest config file. Note -o t on the command line enables tracing of IO #verbose cpuclock 4 if T board 0x0 intbus 0x0 0xff xrwt trace if T bus trace board 0xfe gm813_mmu board 0xb0 gm832 Gemini green board 0xb8 serial_8250 trace tty tty /dev/ttyS0 board 0xe0 gm829_scsi ~/beaver/disks/gem925.dsk board 0xfb gm833 -maxtrack 0x3f board 0xe0 gm829_floppy -geometry D35.2.10.0.512 & ~/beaver/gm512/GM512_ORIGINAL.DMP if T bus io binload cb00 ./beaver/network/cpm64w.bin byte 0 c3 00 eb PS - remember to download latest xbeaver.