Procedure: Replacing Original ATARI 9316 ROMS with 2716 EPROMS
1) Download Game BIN files
2) Have your EPROM burner and eraser ready
3) ERASE Two 2716 EPROMs with ultraviolet light
4) Verify EPROM is blank after using the eraser
5) Program the EPROMS
6) Use a small wire like a wire wrapping wire and solder the following pins
7) Solder pin 12 with one end of the small wire
8) Pull pin 18 upward then solder the other end to this pin
9) Cut pin 18 on the EPROM, leaving enough to be a stub
10) Test the new EPROMS
The reason this is done is as follows
9316 2716
Pin
21 CS(active- Low) | Vpp(read=HIGH) <-pin 21 is tied to pin 18 on the CPU which is already (+5)
18 CS(active-HIGH) | CE(active-Low) <- Lifting the pin from the socket Tie Ground pin 12 to pin 18
Logic to use:
The ROMs on the pinball CPU are 9316s. This is virtually identical to the 2716. See below pin 21 is tied to pin
18 on the CPU, Since pin 18 is tied to pin 21 you must disconnect pin 18 from the socket. For the 2716 to
work pin 18 must be grounded, to do so you will need to lift pin away from the socket and ground pin 18 using
pin 12 with a small wire. Pin 21 is VPP on the 2716 that is now tied to +5 volts. Pin 18 on the 2716 is CS
(active low), this needs to be low so that the EPROM is always selected and active to read the program.
Atari ROM EPROM
9316 2716
A7 1 +-v-+ 24 Vcc A7 1 +-v-+ 24 Vcc
A6 2 | | 23 A8 A6 2 | | 23 A8
A5 3 | | 22 A9 A5 3 | | 22 A9
A4 4 | | 21 CS/ A4 4 | | 21 Vpp
A3 5 | | 20 CS/ A3 5 | | 20 OE/
A2 6 | | 19 A10 A2 6 | | 19 A10
A1 7 | | 18 CS A1 7 | | 18 CE/ <-+ <-Cut leg short Run a thin wire
A0 8 | | 17 D7 A0 8 | | 17 D7 |
D0 9 | | 16 D6 D0 9 | | 16 D6 |
D1 10 | | 15 D5 D1 10 | | 15 D5 |
D2 11 | | 14 D4 D2 11 | | 14 D4 |
GND 12 +---+ 13 D3 GND 12 +---+ 13 D3 |
^----------------------+
9316 Roms to 2716
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