PCB Info file: / 7mezzo.txt
[MAME]
7 e Mezzo
Hardware:
CPU
1x R6502P
1x MC6845P
1x oscillator 10.000MHz
ROMs
1x AM27128 (NS3.1)
2x SEEQ DQ2764 (1, 2)
1x SGS M2764 (NS1)
1x PAL16R4A
1x 4 dipswitches
1x 30x2 connector
1x 10 legs connector
1x trimmer (volume)
PCB Layout:
_________________________________________________________________
| |
| |
| _________ _________ |
| | 74LS08N | | 74LS32 | |
| |_________| |_________| |
| _________ _________ |
| | 74LS138 | | 74HC00 | |
| |_________| |_________| |
| ______________ __________________ |
| | | | | ____|
| | MK48Z02B-20 | | R6502P | |
| |______________| |__________________| |
| ________________ _________ __________________ |
| | | | 74LS157 | | | |____
| | AM27128 | |_________| | MC6845P | ____|
| |________________| _________ |__________________| ____|
| | 74LS157 | ________ _________ ____|
| |_________| | 74LS14 | | 74LS374 | ____|
| ____________ _________ |________| |_________| ____|
| | 74LS245 | | 74LS157 | _________ ____|
| |____________| |_________| | 74HCZ44 | ____|
| ____________ _________ |_________| ____|
| | 74LS245 | | 74LS32 | _______ ____| 30x2
| |____________| |_________| | | | | | ____| connector
| ______________ |4|3|2|1| ____|
| | HM6116 | |_|_|_|_| ____|
| | o MSM2128 | ____|
| |______________| DIP SW x4 ____|
| ______________ ____|
| | HM6116 | ________ _________ ____|
| | o MSM2128 | | 74LS08 | | 74LS174 | ____|
| |______________| |________| |_________| ____|
| ________________ __________ ____|
| | | | PAL16R4A | ____|
| | 2764 | |__________| ____|
| |________________| __________ ____|
| ________________ | 74LS166 | ____|
| | | |__________| |
| | 2764 | __________ |
| |________________| | 74LS166 | |____
| ________________ |__________| __|
| | | __________ _________ | |
| | 2764 | | 74LS166 | | 74LS05 | |8 | 10
| |________________| |__________| |_________| |8 | pins
| ________ ______ __________ _________ |8 | male
| | 74LS04 || osc. | | 74LS193 | | 74LS86 | |8 | connector
| |________||10 MHz| |__________| |_________| |8 |
| |______| |__|
|_________________________________________________________________|
(The following fuse maps are just for reference and will be deleted soon. These PLDs were converted to the new bin format)
Magic Fly PAL16R4A Fuse Map
---------------------------
Device AmPAL16R4A
*
QF2048*
F0*
L000000 11111111111111111111111111111111*
L000032 11111111111111111111111111111111*
L000064 11111111111111111111111111111111*
L000096 11111111111111111111111111111111*
L000128 11111111111111111111111111111111*
L000160 11111111111111111111111111111111*
L000192 11111111111111111111111111111111*
L000224 11111111111111111111111111111111*
L000256 11111111111111111111111111111111*
L000288 11111111111111111111111111111111*
L000320 11111111111111111111111111111111*
L000352 11111111111111111111111111111111*
L000384 11111111111111111111111111111111*
L000416 11111111111111111111111111111111*
L000448 11111111111111111111111111111111*
L000480 11111111111111111111111111111111*
L000512 11111111111111111111111111111111*
L000544 11111111111111111111111111111111*
L000576 11111111111111111111111111111111*
L000608 11111111111111111111111111111111*
L000640 11111111111111111111111111111111*
L000672 11111111111111111111111111111111*
L000704 11111111111111111111111111111111*
L000736 11111111111111111111111111111111*
L000768 11111111111111111111111111111111*
L000800 11111111111111111111111111111111*
L000832 11111111111111111111111111111111*
L000864 11111111111111111111111111111111*
L000896 11111111111111111111111111111111*
L000928 11111111111111111111111111111111*
L000960 11111111111111111111111111111111*
L000992 11111111111111111111111111111111*
L001024 00000000000000000000000000000000*
L001056 00000000000000000000000000000000*
L001088 00000000000000000000000000000000*
L001120 00000000000000000000000000000000*
L001152 00000000000000000000000000000000*
L001184 00000000000000000000000000000000*
L001216 00000000000000000000000000000000*
L001248 00000000000000000000000000000000*
L001280 00000000000000000000000000000000*
L001312 00000000000000000000000000000000*
L001344 00000000000000000000000000000000*
L001376 00000000000000000000000000000000*
L001408 00000000000000000000000000000000*
L001440 00000000000000000000000000000000*
L001472 00000000000000000000000000000000*
L001504 00000000000000000000000000000000*
L001536 00000000000000000000000000000000*
L001568 00000000000000000000000000000000*
L001600 00000000000000000000000000000000*
L001632 00000000000000000000000000000000*
L001664 00000000000000000000000000000000*
L001696 00000000000000000000000000000000*
L001728 00000000000000000000000000000000*
L001760 00000000000000000000000000000000*
L001792 00000000000000000000000000000000*
L001824 00000000000000000000000000000000*
L001856 00000000000000000000000000000000*
L001888 00000000000000000000000000000000*
L001920 00000000000000000000000000000000*
L001952 00000000000000000000000000000000*
L001984 00000000000000000000000000000000*
L002016 00000000000000000000000000000000*
C7F80*
7 e Mezzo PAL16R4A Fuse Map
---------------------------
Device AmPAL16R4A
*
QF2048*
F0*
L000000 01010101010101010101010101010101*
L000032 01010101010101010101010101010101*
L000064 11111111111111111111111111111111*
L000096 11111111111111111111111111111111*
L000128 11111111111111111111111111111111*
L000160 11111111111111111111111111111111*
L000192 11111111111111111111111111111111*
L000224 11111111111111111111111111111111*
L000256 11101110110011101111111111111111*
L000288 11101110110011101111111111111111*
L000320 11001100110011001111111111111111*
L000352 11001100110011001111111111111111*
L000384 11001100110011001111111111111111*
L000416 11001100110011001111111111111111*
L000448 11001100110011001111111111111111*
L000480 11001100110011001111111111111111*
L000512 11111111111111111111111111111111*
L000544 11111111111111111111111111111111*
L000576 11111111111111111111111111111111*
L000608 11111111111111111111111111111111*
L000640 11111111111111111111111111111111*
L000672 11111111111111111111111111111111*
L000704 11111111111111111111111111111111*
L000736 11111111111111111111111111111111*
L000768 11111111111111111111111111111111*
L000800 11111111111111111111111111111111*
L000832 11111111111111111111111111111111*
L000864 11111111111111111111111111111111*
L000896 11111111111111111111111111111111*
L000928 11111111111111111111111111111111*
L000960 11111111111111111111111111111111*
L000992 11111111111111111111111111111111*
L001024 11111111111111111111111111111111*
L001056 11111111111111111111111111111111*
L001088 11111111111111111111111111111111*
L001120 11111111111111111111111111111111*
L001152 11111111111111111111111111111111*
L001184 11111111111111111111111111111111*
L001216 11111111111111111111111111111111*
L001248 11111111111111111111111111111111*
L001280 11111111111111111111111111111111*
L001312 11111111111111111111111111111111*
L001344 11111111111111111111111111111111*
L001376 11111111111111111111111111111111*
L001408 11111111111111111111111111111111*
L001440 11111111111111111111111111111111*
L001472 11111111111111111111111111111111*
L001504 11111111111111111111111111111111*
L001536 11111111111111111111111111111111*
L001568 11111111111111111111111111111111*
L001600 11111111111111111111111111111111*
L001632 11111111111111111111111111111111*
L001664 11111111111111111111111111111111*
L001696 11111111111111111111111111111111*
L001728 11111111111111111111111111111111*
L001760 11111111111111111111111111111111*
L001792 11111111111111111111111111111111*
L001824 11111111111111111111111111111111*
L001856 11111111111111111111111111111111*
L001888 11111111111111111111111111111111*
L001920 11111111111111111111111111111111*
L001952 11111111111111111111111111111111*
L001984 11111111111111111111111111111111*
L002016 11111111111111111111111111111111*
CF0A0*
Memory Map (preliminary)
------------------------
$0000 - $0fff RAM
($0011 store the text lenght)
($0015 - $0016 pointer to video ram)
($0017 - $0018 pointer to color ram)
($0091 - $0091 ???)
($00ab - $00ab ???)
($01fb - $01ff ???)
$0800 - $0801 mc6845? // At begining, write 18 bytes sequentially in $0801, and the increment (x) in $0800.
$1000 - $13ff Video RAM // Initialized in subroutine starting at $cf83, filled with value stored in $5e.
$1800 - $1bff Color RAM // Initialized in subroutine starting at $cf83, filled with value stored in $5f.
// (in 7mezzo is located at $cb13 using $64 and $65 to store video ram and color ram values)
CF83: 48 pha
CF84: 8A txa
CF85: 48 pha
CF86: 98 tya
CF87: 48 pha
CF88: A0 00 ldy #$00
CF8A: AD 5E 00 lda $005E
CF8D: 99 00 10 sta $1000,y
CF90: 99 00 11 sta $1100,y
CF93: 99 00 12 sta $1200,y
CF96: 99 00 13 sta $1300,y
CF99: AD 5F 00 lda $005F
CF9C: 99 00 18 sta $1800,y
CF9F: 99 00 19 sta $1900,y
CFA2: 99 00 1A sta $1A00,y
CFA5: 99 00 1B sta $1B00,y
CFA8: 88 dey
CFA9: D0 DF bne $CF8A
CFAB: 68 pla
CFAC: A8 tay
CFAD: 68 pla
CFAE: AA tax
CFAF: 68 pla
CFB0: 60 rts
$1c00 - $27ff RAM
$2800 - $2800 ??? // suspected input port (code at $ce96). No writes, only reads.
CE96: AD 00 28 lda $2800
CE99: 29 80 and #$80
CE9B: 8D 96 00 sta $0096
CE9E: AD 00 28 lda $2800
CEA1: 29 40 and #$40
CEA3: 8D 97 00 sta $0097
CEA6: AD 00 28 lda $2800
CEA9: 29 10 and #$10
CEAB: 8D 98 00 sta $0098
$2801 - $2fff RAM
$3000 - $3000 ??? // Something seems to be mapped here. Only writes, no reads.
// Code at $c152 do a complex loop with boolean operations and write #$00/#$80 to $3000.
// (actually the program execution stuck here)
C152: 8A txa
C153: 48 pha
C154: 98 tya
C155: 48 pha
C156: A9 00 lda #$00
C158: 8D 1D 00 sta $001D
C15B: AD 4D 00 lda $004D
C15E: F0 15 beq $C175
C160: AD 94 00 lda $0094
C163: 49 FF eor #$FF
C165: 29 80 and #$80
C167: 8D 94 00 sta $0094
C16A: AD 39 00 lda $0039
C16D: 29 70 and #$70
C16F: 0D 94 00 ora $0094
C172: 8D 00 30 sta $3000
C175: 88 dey
C176: D0 05 bne $C17D
C178: CE 4E 00 dec $004E
C17B: F0 09 beq $C186
C17D: CA dex
C17E: D0 F5 bne $C175
C180: AE 4D 00 ldx $004D
C183: 4C 5B C1 jmp $C15B
C186: AD 39 00 lda $0039
C189: 29 70 and #$70
C18B: 8D 00 30 sta $3000
C18E: A9 01 lda #$01
C190: 8D 1D 00 sta $001D
C193: 68 pla
C194: A8 tay
C195: 68 pla
C196: AA tax
C197: 60 rts
$3001 - $bfff RAM
$c000 - $ffff ROM
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