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► Genny multigames
From China/Hong Kong, Korea, Russia, Ukrainia...
How many of these exists ? I don't know!
I even saw on eBay recent releases so the list is still increasing!
What is it exactly ?
Take a cartrdige with a big sized ROM and add a counter IC connected to reset pin and A12+.
Everytime to reset, you increment the counter and so the address in ROM.
First time, the Genny acces to 0x00000xxx (first 4M)
Second time, the Genny acces to 0x00001xxx (second 4M)
....
► Examples
Unless notes, these are Genesis games I personally own
Quantity |
Number |
Description |
Datasheet |
1 |
glue chip |
ROM with the 6 games and bank switch logic ? |
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Connected pins:
...
Quantity |
Number |
Description |
Datasheet |
1 |
GD74LS32 |
Quad 2 input OR |
 |
1 |
GD74LS00 |
Quad 2 input NAND |
|
1 |
GD74LS08 |
Quad 2 input AND |
|
1 |
KK8905 |
from Motorola..unknown
According note above chip, 74LS393 - Dual 4bit binary counter ? |
|
1 |
glue chip |
ROM with the 7 games (?) |
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Connected pins:
B4/5/6 : Address 9/10/18
B16 : !OE
B17 : !CE
B23/23/24/25 : Data 15/14/13/12
B27: Reset
A*: Adress / Data / +5V / Gnd
Quantity |
Number |
Description |
Datasheet |
1 |
GD74LS32 |
Quad 2 input OR |
|
1 |
GD74LS00 |
Quad 2 input NAND |
|
1 |
GD74LS393 |
Dual 4Bit binary counter
pin3,4,5 connected (so 0 to 7) |
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1 |
M11759A |
ROM with 1 game (?) |
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1 |
6428PY69 |
ROM with 2 games (?) |
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1 |
6428PY70 |
ROM with 2 games (?) |
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Note: Big & Heavy! Released before low cost glue chip common usage ?
Connected pins:
B4/5/6/7/8 : Address 9/10/18
B16 : !OE
B17 : !CE
B23/23/24/25 : Data 15/14/13/12
B27: Reset
connected to pin 1 of LS393 (increment)
B32: Cart in
A*: Adress / Data / +5V / Gnd
Quantity |
Number |
Description |
Datasheet |
1 |
PALCE20V8H-25PC/4 |
Flash CMOS 20 input 25ns |
|
2 |
GD4LS00 |
Quad 2 input NAND |
|
1 |
GD74HC74 |
Dual DType flip flop |
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1 |
glue chip |
ROM with the 4 games (?) |
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Connected pins:
B4/5/6/7 : Address 9/10/18/19
B16 : !OE
B17 : !CE
B23/23/24/25 : Data 15/14/13/12
B27: Reset (connected to pins 3/11 of 74HC74)
B32: Cart in
A*: Adress / Data / +5V / Gnd
Quantity |
Number |
Description |
Datasheet |
1 |
M74LS02 |
Quad 2 input NOR |
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1 |
SN74HC08 |
Quad 2 input AND |
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1 |
MN4013B |
Dual DType flip flop |
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1 |
XE81A |
ROM with the 3 games (?) |
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Note: VERY bad work! Look at the back... hand-made?
Connected pins:
B4/5 : Address 9/10
B16 : !OE
B17 : !CE
B23/23/24/25 : Data 15/14/13/12
B27: Reset
B32 : Cart in
A*: Adress / Data / +5V / Gnd
Note: I don't own this cart so, no more info available
Connected pins:
B4/5/6/7 : Address 9/10/18/19
B16 : !OE
B17 : !CE
B23/23/24/25 :Data 15/14/13/12
B32 : Cart in
A*: Adress / Data / +5V / Gnd
► DIY
Forum's topic on multigame
► Links
Rob Webb has some Xin1 games to sell
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