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mac128.cpp: HW note

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AJR 2020-07-18 16:08:21 -04:00
parent 1942d7ed76
commit b5ca52af59
1 changed files with 4 additions and 1 deletions
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src/mame/drivers/mac128.cpp
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@ -17,7 +17,7 @@
0xa00000 - 0xbfffff Zilog 8530 SCC (Serial Communications Controller) Write
0xc00000 - 0xdfffff IWM (Integrated Woz Machine; floppy)
0xe80000 - 0xefffff Rockwell 6522 VIA
0xf00000 - 0xffffef ??? (the ROM appears to be accessing here)
0xf00000 - 0xffffef Open bus??? (the ROM appears to be accessing here)
0xfffff0 - 0xffffff Auto Vector
Interrupts:
@ -37,6 +37,9 @@
PB_EXT (DCDB) from mouse Y circuitry
PA_EXT (DCDA) from mouse X circuitry
The MC68000's FC outputs are not used even for autovectoring. The
VIA's address range is overdecoded to generate VPA for both.
SCC Init:
Control B: