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SubjectRe: Wiring Up Hero Quest Question!  
Posted byloopy
Posted on9/28/04 03:05 AM
From IP24.10.233.26  



Ok, starting over. Like you suggested, I'm presuming this is for replacing a 1Mb 28-pin mask rom with a 32-pin EPROM. In which case (and correct me if I'm wrong):

---

UNROM (mapper 2):
Bend up pins 1, 2, 24 and 31
Solder pin 2 to hole 22 (A16)
Solder pin 24 to GND (OE)

^^^ Also need to tie pins 1, 31, 32 to +5V ???

---

Desolder the PRG chip from the board.
· On the EPROM, bend up pin 1, 2, 24, 31, 32.
· Solder the EPROM onto the board where the PRG rom was.
· Place wire from pin 1 to pin 30, 31, 32 on the EPROM.
· Place a wire from pin 2 to hole 24 on the board. <<< This should say hole 22 ???
· Place a wire from pin 16 to pin 24 on the EPROM.



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Entire Thread
Subject  Posted byPosted On
*Wiring Up Hero Quest Question!  Anonymous9/23/04 09:38 AM
.*Re: Wiring Up Hero Quest Question!  Anonymous9/27/04 06:33 AM
..*Re: Wiring Up Hero Quest Question!  Memblers9/27/04 07:21 AM
...*Re: Wiring Up Hero Quest Question!  Anonymous9/27/04 08:12 AM
....*Re: Wiring Up Hero Quest Question!  Memblers9/27/04 3:40 PM
.....*Re: Wiring Up Hero Quest Question!  Anonymous9/27/04 11:19 PM
......*Re: Wiring Up Hero Quest Question!  loopy9/28/04 00:25 AM
.......*Re: Wiring Up Hero Quest Question!  drk4219/28/04 01:05 AM
........*Re: Wiring Up Hero Quest Question!  loopy9/28/04 02:29 AM
.........*Re: Wiring Up Hero Quest Question!  loopy9/28/04 02:38 AM
...........Re: Wiring Up Hero Quest Question!  loopy9/28/04 03:05 AM
...........*Re: Wiring Up Hero Quest Question!  drk4219/28/04 04:40 AM
........*Re: Wiring Up Hero Quest Question!  drk4219/28/04 01:05 AM
......*Re: Wiring Up Hero Quest Question!  Memblers9/28/04 00:11 AM
.*Re: Wiring Up Hero Quest Question!  tepples9/23/04 3:03 PM
..*Re: Wiring Up Hero Quest Question!  Necrosaro4209/23/04 11:01 PM
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