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Afterburner II Graphic Glitches

djturbolence

djturbolence

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My afterburner II just showed up, but theres some graphic issues. I read on a few posts that I'll need to most likely reprogram some of the chips. Anyone have any experience in this and wheres a good place to start? I dont have a programmer or eraser, but what better time to start than now. I have never used one, but it doesn't seem crazy difficult.
 

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First remove all eproms and maks roms and clean their legs with a sandpaper 1000.

If it did nothing fix , its time to buy a t-48 programmer and burn the x-board test program to find out bad rams.
 
Mrhide said:
first get that running and see if it mentions something bad : https://reassembler.blogspot.com/2020/05/sega-x-board-memory-test-software.html
Click to expand...
  • Remove all sub CPU EPROMs when installing (IC 20, IC 29 etc), as these interfere with the results.
  • It requires a vanilla 68K CPU to be installed, not the FD1094 security processor present on some X-Board games=

    Apologies, but could this be explained? I'm assuming I need to order some blank chips, flash the board test program on them, and replace chips on the game with it?
 
djturbolence said:
Remove all sub CPU EPROMs when installing (IC 20, IC 29 etc), as these interfere with the results.
Click to expand...
Remove those IC's. Pop 'em out prior to doing the test.

djturbolence said:
It requires a vanilla 68K CPU to be installed, not the FD1094 security processor present on some X-Board games
Click to expand...
Afterburner 2 isn't encrypted, so there's no FD1094 to worry about, skip this step.

djturbolence said:
I'm assuming I need to order some blank chips, flash the board test program on them, and replace chips on the game with it?
Click to expand...
Yes, program the two files, and then replace them as the files are labeled. 11107 goes in where 11107 is on the PCB, and 11108 where 11108 is.

A different thread starts to suggest they're non-JEDEC eproms, and if so you'd be looking for 27C1000 for those two. 27c1001 if they are indeed JEDEC.

It's hard to tell what the end result was here: https://www.arcade-projects.com/threads/system-x-conversion.14932/

Order 4 or 5, it's not uncommon to receive busted eproms nowadays.
 
Last edited:
rewrite said:
Remove those IC's. Pop 'em out prior to doing the test.


Afterburner 2 isn't encrypted, so there's no FD1094 to worry about, skip this step.


Yes, program the two files, and then replace them as the files are labeled. 11107 goes in where 11107 is on the PCB, and 11108 where 11108 is.

A different thread starts to suggest they're non-JEDEC eproms, and if so you'd be looking for 27C1000 for those two. 27c1001 if they are indeed JEDEC.

It's hard to tell what the end result was here: https://www.arcade-projects.com/threads/system-x-conversion.14932/

Order 4 or 5, it's not uncommon to receive busted eproms nowadays.
Click to expand...
I appreciate you
 
it's normal to have the artifacting during the test.
All ok is good!


so if you go in the test mode, memory test, are the roms reporting ok ? ( can't see or remember of the above test also test these)
 
Mrhide said:
it's normal to have the artifacting during the test.
All ok is good!


so if you go in the test mode, memory test, are the roms reporting ok ? ( can't see or remember of the above test also test these)
Click to expand...
The standard onboard test shows the Roms are OK as well
 
Well everything is good… except it is not. I am at a lost here :(
 
In my experience with this PCB, and I have a lot because I brought back to life 6 System X this year.

You have bad contacts with the graphical roms or some of them need to be changed.

Poor contact makes these gaps when drawing on the screen.
All it takes is a few dirty legs in the mask roms for any game on the system X to exhibit this behavior.
 
I took out all the lower right eproms and sanded the legs and cleaned them up but no luck. Are there others I should be looking to get cleaned up ?
 
djturbolence said:
I took out all the lower right eproms and sanded the legs and cleaned them up but no luck. Are there others I should be looking to get cleaned up ?
Click to expand...
the game does not check if these eproms are good, it would be necessary to read it on a burner and compare it with the mame files.

If they all pass as good in any romident, the only thing left to do is measure with an oscilloscope whether any data or address line is inactive.

The PCB seems to be capable of drawing the graphics perfectly, it's just not being able to access them on the EPROMs, and this gives these gaps in the image.

I repaired a GP Raider that had broken traces in the graphics eproms, the behavior was the same as this AB2.
 
man1aco said:
the game does not check if these eproms are good, it would be necessary to read it on a burner and compare it with the mame files.

If they all pass as good in any romident, the only thing left to do is measure with an oscilloscope whether any data or address line is inactive.

The PCB seems to be capable of drawing the graphics perfectly, it's just not being able to access them on the EPROMs, and this gives these gaps in the image.

I repaired a GP Raider that had broken traces in the graphics eproms, the behavior was the same as this AB2.
Click to expand...
Perfect. I have a reader so I’ll start checking the data one by one and hopefully I find the culprit.
 
man1aco said:
the game does not check if these eproms are good, it would be necessary to read it on a burner and compare it with the mame files.

If they all pass as good in any romident, the only thing left to do is measure with an oscilloscope whether any data or address line is inactive.

The PCB seems to be capable of drawing the graphics perfectly, it's just not being able to access them on the EPROMs, and this gives these gaps in the image.

I repaired a GP Raider that had broken traces in the graphics eproms, the behavior was the same as this AB2.
Click to expand...
Mostly Fixed! Had 2 bad EPROMs, flashed some new chips and the graphics are good to go.

I did the afterburner enhanced mod, but my audio was messed up. I tried to wipe and reflash the chip but now I'm getting a bad pin#28. I'll have to order a new D27C512D Chip and reflash it. But I'm super thankful for all the advice! What sucks is this Arcade is due at an event 8 Days from now. Any chance someone has a chip they can send over quickly ?
 
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