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Re: Clone IOU / MMU Chip
On Jan 16, 2:46 pm, aiiad...@gmail.com wrote:
> what else?
please add, remove, or make corrections if you can.
IOU/MMU:
would need outputs to select either 1)main ram or 2)aux ram
bank
also need outputs to select graphics mode (HI/LO res, page 1/2,
mixed/full, text/graphics)
some locations are flags, which indicate the status of softswitches,
so the IC's either have to 1)store the status in them or 2)have a
method
to read from the hardware the state of the switches.
zero page = $0000 - $00FF
stack = $0100 - $01FF
inputbuff = $0200 - $02FF
RAM = $0300 - $BFFF
Keyboard = $c000 ;keycode (Read)
CLR80STORE= $C000 ;80STORE Off- disable 80-column memory mapping
(Write)
SET80STORE= $C001 ;80STORE On- enable 80-column memory mapping
(WR-only)
CLRAUXRD = $C002 ;read from main 48K (WR-only)
SETAUXRD = $C003 ;read from aux/alt 48K (WR-only)
CLRAUXWR = $C004 ;write to main 48K (WR-only)
SETAUXWR = $C005 ;write to aux/alt 48K (WR-only)
CLRCXROM = $C006 ;use ROM on cards in $c100-$cfff (WR-only)
SETCXROM = $C007 ;use internal ROM in $c100-$cfff (WR-only)
CLRAUXZP = $C008 ;use main zero page, stack, & LC (WR-only)
SETAUXZP = $C009 ;use alt zero page, stack, & LC (WR-only)
CLRC3ROM = $C00A ;use internal Slot 3 ROM (WR-only)
SETC3ROM = $C00B ;use external Slot 3 ROM (WR-only)
CLR80VID = $C00C ;disable 80-column display mode (WR-only)
SET80VID = $C00D ;enable 80-column display mode (WR-only)
CLRALTCH = $C00E ;use main char set- norm LC, Flash UC (WR-only)
SETALTCH = $C00F ;use alt char set- norm inverse, LC; no Flash
(WR-only)
CLKbdSTB = $c010 = kbd clear strobe
--------------HIBIT SET IF: (read)
RDLCBNK2 = $C011 ;reading from LC bank $Dx 2 (Read)
RDLCRAM = $C012 ;reading from LC RAM (Read)
RDRAMRD = $C013 ;reading from aux/alt 48K (Read)
RDRAMWR = $C014 ;writing to aux/alt 48K (Read)
RDCXROM = $C015 ;using internal Slot ROM (Read)
RDAUXZP = $C016 ;using Slot zero page, stack, & LC (Read)
RDC3ROM = $C017 ;using external (Slot) C3 ROM (Read)
RD80COL = $C018 ;80STORE is On- using 80-column memory mapping (Read)
RDVBLBAR = $C019 ;not VBL (VBL signal low) (Read)
RDTEXT = $C01A ;using text mode (Read)
RDMIXED = $C01B ;using mixed mode (Read)
RDPAGE2 = $C01C ;using text/graphics page2 (Read)
RDHIRES = $C01D ;using Hi-res graphics mode (Read)
RDALTCH = $C01E ;using alternate character set (Read)
RD80VID = $C01F ;using 80-column display mode (Read)
TAPEOUT = $C020 ;toggle the cassette output.
******* = $c021
******* = $c022
******* = $c023
******* = $c024
******* = $c025
******* = $c026
******* = $c027
******* = $c028
******* = $c029
******* = $c02A
******* = $c02B
******* = $c02C
******* = $c02D
******* = $c02E
******* = $c02F
SPEAKER = $C030 ;toggle speaker diaphragm
******* = $c031
******* = $c032
******* = $c033
******* = $c034
******* = $c035
******* = $c036
******* = $c037
******* = $c038
******* = $c039
******* = $c03A
******* = $c03B
******* = $c03C
******* = $c03D
******* = $c03E
******* = $c03F
util stb = $c040 ;on game connector
******* = $c041
******* = $c042
******* = $c043
******* = $c044
******* = $c045
******* = $c046
******* = $c047
******* = $c048
******* = $c049
******* = $c04A
******* = $c04B
******* = $c04C
******* = $c04D
******* = $c04E
******* = $c04F
SW.TXTCLR= $C050 ;graphics softswitches
SW.MIXCLR= $C052
SW.MIXSET= $C053
SW.LOWSCR= $C054
SW.HISCR = $C055
SW.LORES = $C056
SW.HIRES = $C057
ann0off = $c058
ann0on = $c059
ann1off = $c05a
ann1on = $c05b
ann2off = $c05c
ann2on = $c05d
ann4off = $c05e
ann4on = $co5f
CASSETTE = $C060
pb0 = $c061 ;This is also Open Apple on keyboard
PB1 = $c062 ;This is also Closed Apple on Keyboard
pb2 = $c063
pdl0 = $c064 ;"paddle" inputs
pdl1 = $c065
pdl2 = $c066
pdl3 = $c067
******* = $c068
******* = $c069
******* = $c06A
******* = $c06B
******* = $c06C
******* = $c06D
******* = $c06E
******* = $c06F
ResetPDL = $c070 ;reset paddle timing circuit
******* = $c071
******* = $c072
******* = $c073
******* = $c074
******* = $c075
******* = $c076
******* = $c077
******* = $c078
******* = $c079
******* = $c07A
******* = $c07B
******* = $c07C
******* = $c07D
******* = $c07E
******* = $c07F
-Bank 2 selection
-READRAM2 = $C080 READ RAM no write
-RROMWRAM2 = $C081 READ ROM write RAM
READROM = $C082 ROM override
-RDWRTLC2 = $C083 Read RAM write RAM
~Bank 1 selection
******* = $c084
******* = $c085
******* = $c086
******* = $c087
~READRAM1 = $C088 Read RAM no write
~RROMWRAM1= $C089 ReadROM Write RAM
******* = $c08A
~RDWRTLC1 = $C08B Read RAM write RAM
******* = $c08C
******* = $c08D
******* = $c08E
******* = $c08F
******* = $c090
******* = $c091
******* = $c092
******* = $c093
******* = $c094
******* = $c095
******* = $c096
******* = $c097
******* = $c098
******* = $c099
******* = $c09A
******* = $c09B
******* = $c09C
******* = $c09D
******* = $c09E
******* = $c09F
******* = $c0A0
******* = $c0A1
******* = $c0A2
******* = $c0A3
******* = $c0A4
******* = $c0A5
******* = $c0A6
******* = $c0A7
******* = $c0A8
******* = $c0A9
******* = $c0AA
******* = $c0AB
******* = $c0AC
******* = $c0AD
******* = $c0AE
******* = $c0AF
******* = $c0B0
******* = $c0B1
******* = $c0B2
******* = $c0B3
******* = $c0B4
******* = $c0B5
******* = $c0B6
******* = $c0B7
******* = $c0B8
******* = $c0B9
******* = $c0BA
******* = $c0BB
******* = $c0BC
******* = $c0BD
******* = $c0BE
******* = $c0BF
******* = $c0C0
******* = $c0C1
******* = $c0C2
******* = $c0C3
******* = $c0C4
******* = $c0C5
******* = $c0C6
******* = $c0C7
******* = $c0C8
******* = $c0C9
******* = $c0CA
******* = $c0CB
******* = $c0CC
******* = $c0CD
******* = $c0CE
******* = $c0CF
******* = $c0d0
******* = $c0D1
******* = $c0D2
******* = $c0D3
******* = $c0D4
******* = $c0D5
******* = $c0D6
******* = $c0D7
******* = $c0D8
******* = $c0D9
******* = $c0DA
******* = $c0DB
******* = $c0DC
******* = $c0DD
******* = $c0DE
******* = $c0DF
******* = $c0E0
******* = $c0E1
******* = $c0E2
******* = $c0E3
******* = $c0E4
******* = $c0E5
******* = $c0E6
******* = $c0E7
******* = $c0E8
******* = $c0E9
******* = $c0EA
******* = $c0EB
******* = $c0EC
******* = $c0ED
******* = $c0EE
******* = $c0EF
******* = $c0F0
******* = $c0F1
******* = $c0F2
******* = $c0F3
******* = $c0F4
******* = $c0F5
******* = $c0F6
******* = $c0F7
******* = $c0F8
******* = $c0F9
******* = $c0FA
******* = $c0FB
******* = $c0FC
******* = $c0FD
******* = $c0FE
******* = $c0FF
SLOT1I/O = $C100-C1FF
SLOT2I/O = $C200-C2FF
SLOT3I/O = $C300-C3FF
SLOT4I/O = $C400-C4FF
SLOT5I/O = $C500-C5FF
SLOT6I/O = $C600-C6FF
SLOT7I/O = $C700-C7FF
CARDROM = $C800-CFFF
AsoftROM = $D000-
MonitorROM =