I wonder if this is the reason why just replacement of the dead proms is not alway successful.
That's my understanding, yes.
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I wonder if this is the reason why just replacement of the dead proms is not alway successful.
Be aware that the MFG of the PROM chip and it's location are important on this game. Do not choose any random PROM when programming a replacement. The speed idiosyncrasies of these chips is baked into it's location/operation.
I can make it available if there is interest. I made it because I used to have no easy way to verify them. I'll try to upload the design to github today.My real question is.. is that PROM adapter/pcb available? One of those would be very helpful.
If you want a board I can mail one out. These ones are a bit flawed because I didn't think it through. I have a couple left. They work but need a bit of modification.That would be great. a way to read PROMs fast like that is nice..
If it works after mods - I'd like one.. thanksIf you want a board I can mail one out. These ones are a bit flawed because I didn't think it through. I have a couple left. They work but need a bit of modification.
That would be great. a way to read PROMs fast like that is nice..
I made a bunch of adapters like that for the atmel 27c256 45ns otp eproms. I really should finally have these all made and tested. I was much dumber 4 years ago than I am now, so I should also check the design...Yeh, better than reversing the pins/socket on an individual PROM-to-W27C512 adapter and reading them as 512.
One board to read them all. Nice.
![]()
I would be surprised if Atari was able to manage this BITD, i.e. specific manufacturer part only allowed for a specific location on the board for the same common part code. Unless they were single-sourced, which is doubtful due to risk of procurement.
I've never seen this claim before for other boards using PROMs. Is I,Robot that dependent?
Unfortunately, the Atari AVL, which I have, does not list the approved manufacturers of 136029-XXX bipolar PROMs.
If it works after mods - I'd like one.. thanks
I'll PM info.




I think to clarify on this point from @bakerhillpins is that many of these PROM locations REQUIRE the higher speed TI PROMS or the B (high speed) Harris PROMs... and to @VectorCollector point, Atari spec'd high speed PROMS for ALL the locations.... I think they were all TI (Plastic) or Harris(Ceramic). What I have seen over the years is that when PROM's have died, previous repairs over the years have thrown in the lower speed PROM's because folks were mostly looking a capacity+configuration vs specifically the speeds because it is a bit of a rabbit hole finding the speed suffix information (especially for aformentioned Harris because they changed their speed labeling through the early 80s)... So, I guess my actual point is that you can't necessarily go with replacing what is there because it may not be original and may have been replaced with an out of spec PROM... the lower speed PROMs *will work* in some locations but I expect by doing that, it is probably working your PCB set closer to a 'You have hit a black hole' message.I would be surprised if Atari was able to manage this BITD, i.e. specific manufacturer part only allowed for a specific location on the board for the same common part code. Unless they were single-sourced, which is doubtful due to risk of procurement.
I've never seen this claim before for other boards using PROMs. Is I,Robot that dependent?
Unfortunately, the Atari AVL, which I have, does not list the approved manufacturers of 136029-XXX bipolar PROMs.

Thanks for the heads up! That kinda sucks because some of these are tricky to read what the original chip were.
@lilypad19 when you replaced bad PROMs where did you get them from?
I ordered a few of these from Mark but his programmer is down so I'll have to find someone who can program them.
View attachment 815596
I really need to find a DATA I/O,..
All the PROMs on the 5 sets I worked on were that prom, except a few ceramics here/there. Board #1 - all 13 PROMs were the TBP24S41N, no ceramicsWhere are you guys getting the info that TBP24S41N is equivalent? I'm not seeing it on any of the cross ref lists....
Never mind, I see it now on the pic of the damn PROM I posted. lol![]()