Cromemco 68020 system, XXU CPU card and STDX Disk controller card
David Emulator card Revision B, BeagleBone Black, ver 234 of Davids Code
# create disk BBB /cromemco/emu/mfm_emu --initialize --file /cromemco/disk/D47.C50.H16.transfer.hdd.ver234 --heads 16 --cylinders 50 --drive 1 # start disk BBB ./mfm_emu --file /cromemco/disk/D45NEW.C1536.H16.master.hdd,/cromemco/disk/D47.C50.H16.transfer.hdd.ver234 --drive 1,2 # start Cromemco computer ... results below # time to 2021 time -s Wednesday, February 6, 2036 13:52:18 DATE (mm/dd/yy): 5/9/121 TIME (hh:mm:ss): 23.31 Sunday, May 9, 2021 23:31:00 # start initialise new disk system[1] inithard -n 68020 XXU 172 Inithard source 2.8 Press: RETURN to supply default answers CTRL-C to abort program Warning: INITHARD can destroy all disk data Device name? std63 SYSTEM HANGS !!
# create disk /root/ver110/emu/mfm_emu --initialize --file /cromemco/disk/D47.C50.H16.transfer.hdd.ver110 --heads 16 --cylinders 50 --drive 1 # start BBB emulation cd /cromemco/emu # start Cromemco time -s Wednesday, February 6, 2036 6:33:22 DATE (mm/dd/yy): 5/9/121 TIME (hh:mm:ss): 23.42 Sunday, May 9, 2021 23:42:00 # start initialise program system[1] inithard -n 68020 XXU 172 Inithard source 2.8 Press: RETURN to supply default answers CTRL-C to abort program Warning: INITHARD can destroy all disk data Device name? std63 Number of surfaces (1 - 16) <32> ? 16 Number of cylinders (1 - 4096) <1283> ? 50 Max number of alternate tracks must be a multiple of the number of surfaces Max number of alternate tracks (0 - 112) <0> ? Starting cylinder of disk (0 - 50) <1> ? Starting cylinder for write precomp (0 - 50) <50> ? Do you want to initialize any tracks (Y/N) <N> ? y First cylinder (0 - 49) <0> ? Last cylinder (0 - 49) <49> ? First head (0 - 15) <0> ? BREAK OUT SO AS NOT TO CHANGE EMULATOR FILE
-rw-r--r-- 1 root root 16678504 May 9 22:18 D47.C50.H16.transfer.hdd.ver234 -rw-r--r-- 1 root root 16678504 May 9 22:19 D47.C50.H16.transfer.hdd.ver110 # cd /cromemco/disk # cmp -b --verbose D47.C50.H16.transfer.hdd.ver110 D47.C50.H16.transfer.hdd.ver234 | head 109 0 ^@ 252 M-* 110 0 ^@ 252 M-* 111 0 ^@ 252 M-* 112 0 ^@ 252 M-* 113 0 ^@ 252 M-* 114 0 ^@ 252 M-* 115 0 ^@ 252 M-* 116 0 ^@ 252 M-* 117 0 ^@ 252 M-* 118 0 ^@ 252 M-*
So my early conclusion is that the 110 code formatted the data in the disk file to 0 and the code is placing decimal 252 i.e. FC and the Cromemco system for whatever reason it hanging. Note that that the inithard -n command (instead of just inithard) is to prepare a new blank disk, because in the normal case it goes looking around the first 20, 512 byte sectors of the disk looking for a filesystem AFAIK.