Luis' Build

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lrodriguezrullan
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Re: Luis' Build

Post by lrodriguezrullan »

Yes. 5V.
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Re: Luis' Build

Post by lrodriguezrullan »

The Dual TOS jumper is open.
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exxos
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Re: Luis' Build

Post by exxos »

So you need to continuity check GLUE pins back to the socket you got the jumper wires on (remove the wires for now). Address bus, AS,UDS,LDS,DTACK etc

The put back the wires and check all those pins on the GLUE are all connected to GND. GLUE has to have all the address lines low to enable the ROM.

IIRC ROM2 should be set low on power up. If its not I then I can only assume the GLUE is faulty or not getting the 8mhz clock.

If ROM2 does go low on power up then the ROM jumper link above port #1 should be low also. If not , then maybe the small ic is blown.

That's all I can really suggest for now.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Re: Luis' Build

Post by lrodriguezrullan »

I apologize for my ignorance. Which pins in the glue socket should have continuity to which pins in the 5V bus IO port socket?

Thanks.
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Re: Luis' Build

Post by exxos »

lrodriguezrullan wrote: Mon Feb 14, 2022 2:18 am I apologize for my ignorance. Which pins in the glue socket should have continuity to which pins in the 5V bus IO port socket?
https://www.exxosforum.co.uk/forum/viewt ... =89&t=3457
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
lrodriguezrullan
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Re: Luis' Build

Post by lrodriguezrullan »

Thanks. I'll take a look at those diagrams.
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Re: Luis' Build

Post by lrodriguezrullan »

Just did the continuity test between the glue and a 5v IO port. There is no continuity on A18, A21, A22, and A23.

I checked the soldering on the glue socket and it looks good.

I am not sure if this helps, but if I close the ROM jumper, I get a black screen with a white border. A pattern with different color lines appears very briefly, leaving the black screen with the white border only. The pattern is similar to the one I've seen when the RAM is bad.
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Re: Luis' Build

Post by lrodriguezrullan »

I got the diagnostics cart and am getting the following results over the serial port:

<FF><0D><0A>I1 RAM/data line error 0000000000000000 0000000100000000 000008
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Re: Luis' Build

Post by PhilC »

lrodriguezrullan wrote: Sun Sep 04, 2022 7:32 pm I got the diagnostics cart and am getting the following results over the serial port:

<FF><0D><0A>I1 RAM/data line error 0000000000000000 0000000100000000 000008
You've got a stuck bit on one of the ram data lines, check your ram soldering :)
If it ain't broke, test it to Destruction.
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Re: Luis' Build

Post by lrodriguezrullan »

Thanks! I double-checked the solder of the SIMM socket and it looks OK. At least I don't see any solder touching multiple pins.
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