💾 Archived View for gemini.spam.works › mirrors › textfiles › games › CONSOLES › schem captured on 2020-10-31 at 23:30:46.
-=-=-=-=-=-=-
Parts list:
Cut down 76 pin connector available at Radio Shack--trim to 64 pins
Male DB25 connector/Hood
14 conductor wire for cable
+5 V power supply
2x1 uF tantalum caps
1x.0015 uF capacitor
5x 74LS93
2x 74LS153
5x 14 pin sockets (wire wrap)
2x 16 pin sockets (wire wrap)
A board to make it on
NOTES:
SA1-SA32 are Genesis pins A1-A32
SB1-SB32 are Genesis pins B1-B32
P1-P25 are Amiga parallel port pins 1-25
+-----------------+
| 1 |
+--------------------------------+--------+ |
5 | B | 12 |
>----+ Vcc 1 +--------+-------->A 1 SA17
10 | | 9
>----+ Gnd 74LS93 2 +----------------->A 2 SA15
14 | | 8
>----+ A 3 4 +----------------->A 3 SA13
CNT | | 11
| 8 +------+---------->A 4 SA11
| R1 R2 | |
+---+----+--------------------------------+ |
| 2 | 3 |
>-------+----+ +--------------------------+
CLR | | | +-----------------+
| 2 | 3 | 14 | 1 |
+---+----+------------+----------+--------+ |
5 | R1 R2 A B | 12 |
>----+ Vcc 1 +--------+-------->A 5 SA9
10 | | 9
>----+ Gnd 74LS93 2 +----------------->A 6 SA7
| | 8
| 4 4 +----------------->A 7 SA5
| | 11
| 8 +------+---------->A 8 SA3
| R1 R2 | |
+---+----+--------------------------------+ |
| 2 | 3 |
| | +--------------------------+
| | | +-----------------+
| 2 | 3 | 14 | 1 |
+---+----+------------+----------+--------+ |
5 | R1 R2 A B | 12 |
>----+ Vcc 1 +--------+-------->A 9 SB4
10 | | 9
>----+ Gnd 74LS93 2 +----------------->A10 SB5
| | 8
| 5 4 +----------------->A11 SA4
| | 11
| 8 +------+---------->A12 SA6
| R1 R2 | |
+---+----+--------------------------------+ |
| 2 | 3 |
| | +--------------------------+
| | | +-----------------+
| 2 | 3 | 14 | 1 |
+---+----+------------+----------+--------+ |
5 | R1 R2 A B | 12 |
>----+ Vcc 1 +--------+-------->A13 SA8
10 | | 9
>----+ Gnd 74LS93 2 +----------------->A14 SA10
| | 8
| 6 4 +----------------->A15 SA12
| | 11
| 8 +------+---------->A16 SA14
| R1 R2 | |
+---+----+--------------------------------+ |
| 2 | 3 |
| | +--------------------------+
| | | +-----------------+
| 2 | 3 | 14 | 1 |
+---+----+------------+----------+--------+ |
5 | R1 R2 A B | 12 |
>----+ Vcc 1 +--------+-------->A17 SA16
10 | | 9
>----+ Gnd 74LS93 2 +----------------->A18 SB6
| | 8
| 7 4 +----------------->A19 SB7
| | 11
| 8 +----------------->A20 SB8
| |
+-----------------------------------------+
+-------------------------------------+
>-16--+ Vcc 1C0 +---6-------------> D0 SA20
| 1C1 +---5-------------> D4 SA28
>--8+-+ Gnd 1C2 +---4-------------> D8 SA21
| | 1C3 +---3-------------> D12 SB25
1 +-+ Strobe 1G |
15 +-+ Strobe 2G LS153 |
SEL0 | |
>--15--+ A 1 2C0 +---10------------> D1 SA23
SEL1 | 2C1 +---11------------> D5 SA25
>--2---+ B 2C2 +---12------------> D9 SA24
| 2C3 +---13------------> D13 SB24
+--+-------+--------------------------+
AD0>---------+ 7 + 9
AD1>-----------------+
+-------------------------------------+
>-16--+ Vcc 1C0 +---6-------------> D2 SA26
| 1C1 +---5-------------> D6 SA22
>--8+-+ Gnd 1C2 +---4-------------> D10 SA27
| | 1C3 +---3-------------> D14 SB23
1 +-+ Strobe 1G |
15 +-+ Strobe 2G LS153 |
SEL0 | |
>--15--+ A 2 2C0 +---10------------> D3 SA29
SEL1 | 2C1 +---11------------> D7 SA19
>--2---+ B 2C2 +---12------------> D11 SA30
| 2C3 +---13------------> D15 SB22
+--+-------+--------------------------+
AD2>---------+ 7 + 9
AD3>-----------------+
GND>----------------------------------------> SA1, SA32, SB16, SB17
+5 >----------------------------------------> SA2, SA32
P2 >-----> CNT >--------------+--->
P3 >-----> CLR >-----+--> |
P4 >-----> SEL0--> | ---
P5 >-----> SEL1--> | --- .0015
P6 >-----> AD0--> --- | uF
P7 >-----> AD1--> --- 1 |
P8 >-----> AD2--> | uF |
P9 >-----> AD3--> | |
P18 >-----> GND >-----+--------+---->
---
--- 1uF
|
+5 >------------------+------------->