Pole Position plays blind

[bencao74]

Replaced PROM with new programmed one. Red is working fine now and the picture has no distortion anymore. Hence there are some stripes like scanlines in the sprites itself. Anyone?
 

[bencao74]

Okay, after soom reading I`ve this infos:

Small cars and signs - PROM 12N, 13N

Manual on page 3-47 points out that part no. 136014-125 and 125 are affected. But I don't find any IC spec. And it`s not listed as custom IC. What type of IC is used for 12N and 13N?

[bencao74]

Okay, misson accomplished.

This was the starting point in gyruss kitchen.

Red was distorted.



Replaced Color PROM 11E RED





Sprites still looked bad. Every second lines is missing.

http://www.arcade-museum.com/manuals-videogames/P/polepos.pdf

I checked schematic 15A Motion Object Line Buffer. Control Logic for Lines is in 74S158@8D (control logic) and the lines are recombines in 74S298 (recombines lines). Line Buffer is needed in SRAM 2148L-2 @ 9F, 10F.

9F and 10F are 55ns RAM; 137199-00, used 2149 ones.

First I replaced the SRAM and the magic happened...



This are the bad boys

Desoldered them...

replaced them with sockets


some more pics


replaced PROM 11E


replaced connector

http://bencao74.blogspot.de/2012/11/pole-position-repair-log.html

[gyruss]

Nice, congratulations! So now it's fully working? Are you going to do something about the outside?

[bencao74]

Hey,

 I want to remove the battery and add one of this NVRAM stuff. Then I want to improve the power harness inside the cab and add one missing fuses

I`ve receive from SuperUlly the Plexi for the back. So this will then the first part of the enclosure restoration. Perhaps I`ll give then the CPO a try.

But most important, the game is running smooth

[Belike]

Great work, nice to see it's running perfect.
Thanks for the technical overview also, we learn more and more each day about pcb repairing.

[Etienne MacGyver]

Good Job !   

[anunaki]

great game, great job

[gyruss]

http://ppclone.blogspot.nl/  like it's almost ready!