From 68ef85836c9f5f57a8abb4c35785dc384d10f76a Mon Sep 17 00:00:00 2001 From: AJR Date: Sun, 23 Aug 2020 23:59:39 -0400 Subject: [PATCH] unk6502_st2xxx.cpp: Better guess --- src/mame/drivers/unk6502_st2xxx.cpp | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/mame/drivers/unk6502_st2xxx.cpp b/src/mame/drivers/unk6502_st2xxx.cpp index 14362245560..0573fb64299 100644 --- a/src/mame/drivers/unk6502_st2xxx.cpp +++ b/src/mame/drivers/unk6502_st2xxx.cpp @@ -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"