Format of COMBI-disk command packet:
Offset Size Description )
00h WORD version
02h BYTE command code (see #01538)
---command code 80h---
no additional fields
---command code 81h---
03h BYTE new options byte (see #01540)
---command code 82h---
03h WORD number of KB to release
---command code 83h---
03h WORD number of KB to expand
---command code 84h---
03h DWORD -> buffer for block info (see #01541)
---command code 85h---
03h DWORD block ID
---command code 86h---
03h BYTE which counters to reset
bit 0: hard disk read counts
bit 1: hard disk write counts
bit 2: RAM disk read/write counts
Note: multiple commands may be placed in a single packet by stringing
together as many command/argument pairs as desired