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| Code Block | ||
|---|---|---|
| ||
IN:
A = memory mask arguments (several arguments OR'ed together):
Destination segment (allocated memory addressed for segment):
MM_S0 ($00), segment 0
MM_S1 ($40), segment 1
MM_S2 ($80), segment 2
MM_S3 ($C0), segment 3
Source of memory (to be allocated):
MM_FIX ($02), fixed workspace (not subject to swapping)
or
MM_SLT ($04), explicit slot usage, mask also following:
MC_CI ($10), internal memory
MC_C1 ($01), card 1
MC_C2 ($02), card 2
MC_C3 ($03), card 3
Allocation variations:
MM_EXC ($10), exclusive use of bank
MM_MUL ($20), use multiple banks
BC = 0, always
OUT, if call successful:
Fc = 0
IX = memory pool handle
OUT, if call failed:
Fc = 1
A = error code:
RC_NA ($06), handle not available
RC_ROOM ($07), no room
Registers changed after return:
A.FBCDEHL/..IY same
.F......./IX.. different |
Notes
MM_EXC and and MC_CI use use the same argument bit. We don't know why, but believe its the same function (Internal & Explicit slot usage). MM_EXC isn't implemented.
If MM_SLT is specified, C holds bank number ($20-$ff) or slot (0-3).
If only destination segment is specified, you get memory from bank with
most free space.
OS_Mop doesn't allocate any memory, so even the very first OS_Mal can
fail.
If only the memory segment mask are specified, it is probably default'ed to MM_MUL - for the rest of the arguments, we don't know. MM_FIX is probably an internal usage.
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