Atari I,Robot PCB testing, troubleshooting, and WORKING!

Not sure what I'm actually going to get from Mark, but if its the HM1-7643-5 listed it should be ok. *Edit: even though the '-5' matches the original, its not the same speed.
I have these PROMs on my working boardset (in fact, they are Atari labeled chips):
Chip
Manufacturer
ChipManufacturer Listed
Access Time
Texas InstrumentsTBP24S41N40ns
HarrisM1-7643B-545ns

They are within I, Robot specifications:
Manual
Specification
Manufacturer listed
Access Time
82HS137 PROM Integrated Circuit45ns (Signetics N82HS137)
 
I
I have these PROMs on my working boardset (in fact, they are Atari labeled chips):
Chip
Manufacturer
ChipManufacturer Listed
Access Time
Texas InstrumentsTBP24S41N40ns
HarrisM1-7643B-545ns

They are within I, Robot specifications:
Manual
Specification
Manufacturer listed
Access Time
82HS137 PROM Integrated Circuit45ns (Signetics N82HS137)


I've been working on a more comprehensive equvilent list:

SpeedSigneticsFujitsuFairchildMMITIHarrisRaytheonAMDNECNationalIntel
60ns82S137MB712293453C6353-124S417643-52964127S33uPB42674S5733625
45ns82S137A--63S441-7643A--uPB426-174S573A-
35ns82S137BMB27S33A-63S441A24S41N7643B-27S33AuPB426-274S573B-
 
Charles,

Just this morning, I burned some MMI 63S441 which are 82HS137 equivalents. The CPU board takes 13 of these. They are 45ns, which meets Atari I, Robot specs. They worked fine on my boardset.
 
Im considering desoldering all the video board ram, testing it and installing sockets….

I know some of them have issues.
 
They ended up being the Harris 7643-5, which I was concerned about the speed on. They are working for now, we'll see if issues pop up.
The PROM xref lists them at 60ns. The I, Robot specs call for 45ns, but "if it ain't broke, don't fix it".
 
/end of thread :)

Maybe, but maybe not.


Besides testing it on a different monitor than a 4600 to see if I can sync it, @64B1T brought up how its weird that it doesn't show the full attract mode. And that Mame also doesn't show the full attract..

The board still has one of the SEEQ eproms I want to replace and the little switchers I'm using for test powering the boards don't like how much power this boardset pulls. I may need to check how many amps it's actually pulling.

The other variable is that I don't have a joystick hooked up and may it being out of limits or whatever the message is may be making the attract screen cycle through screens.
 
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