rl2/bnkdoc

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2023-08-16 06:16:32 -07:00
note: this is a continuation of rl2doc! see that first for more context
opl3 data table entry
offset | size | token | description
----------|----------|-------|--------------------------------------------------
0 | 28 | | opl3 parameters
instrument entry
offset | size | token | description
----------|----------|-------|--------------------------------------------------
0 | 3 | | ascii signature 'O3_'
3 | 12 | | null padded, null terminated instrument name
15 | 5 | | unknown (always 01 00 00 00 00)
21 | 2 | | offset into file (inside opl3 data table)
23 | 2 | | unknown (all zero)
25 | 2 | | unknown (either size of this table or size of
| | | opl3 data table entry; always 28)
27 | 2 | | unknown (either size of this table or size of
| | | opl3 data table entry; always 28)
TODO: offsets are wrong! sizes are correct
main header
offset | size | token | description
----------|----------|-------|--------------------------------------------------
0 | 30 | | ascii signature 'Accomp. Bank, (C) AdLib Inc\x00
| | | \x01\x01'
31 | 10 | | unknown (all zero)
41 | 2 | | multiply by 28, then add 48 to get offset
| | | to the start of the opl3 data table
42 | 2 | is | number of defined instruments
44 | 4 | | unknown (all zero)
48 | [is]*28 | int | instrument name table