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unk6502_st2xxx.cpp: Better guess

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AJR 2020-08-23 23:59:39 -04:00
parent 3b5f754717
commit 68ef85836c
1 changed files with 2 additions and 1 deletions
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src/mame/drivers/unk6502_st2xxx.cpp
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@ -15,7 +15,8 @@
// ST2205U cannot execute code directly from Flash, but has a built-in DMA-compatible NAND interface on Port F ($05).
// The XOR used on ragc153 & dphh8630 is likely performed by the DMA controller.
// $6003 performs a table lookup, depositing a sequence of data at $008e.
// $6000 generates some duration of delay based on the X register.
// $6000 is some sort of macro call with the X register as function selector
// (X = $24 should display the character in $0102 on screen).
// One other BIOS call ($6975 in bbl380, $69d2 in ragc153) has an unknown purpose.
#include "emu.h"