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| Mac Plus error code |
Posted by: IlikeTech on 2016-12-02 13:33:39
I recently got an old Mac Plus, but it throws the error code 038000 after chiming.
Any ideas what this means? I read that it could mean a memory problem.
Thanks,
IlikeTech
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Posted by: BadGoldEagle on 2016-12-02 14:14:21
Yeah you're right. That is indeed a memory problem. According to Larry Pina's The Dead Mac Scrolls this code means there's an issue with SIMMS 2 and/or 4.
You should open it up, remove the logic board as well as the 4 simms, clean the pads/sockets and retry.
But the RAM is probably bad. It happens. You can get new simms on sites like welovemacs or any equivalent.
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Posted by: IlikeTech on 2016-12-02 14:23:48
Yea, ok. I am wondering if it is just standard 30 pin simm 150ns or less RAM. Also, do all slots need to be populated?
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Posted by: bibilit on 2016-12-03 00:12:57
IIRC the minimum is 1 Meg, meaning all slots populated with 256 k sticks, Yes you need to have all of them populated, using two 1 Meg in the A bank (the one closer to the Processor) and leaving 256 Ks in the B Bank will give you 2,5 Mo of memory... but a pair of resistors should been removed or clipped (R8 and R9)
Max ram is 4 Meg.
Yes standard 30 pin simm 150ns.
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Posted by: IlikeTech on 2016-12-03 15:43:02
I tried reseating the simms, with no luck. I just ordered 4 1MB 70ns simms for about 16 dollars shipped. I will blow out the sim sockets before I install them. I sure hope this works, because I don't want to spend all that much more money on it.
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Posted by: BadGoldEagle on 2016-12-04 03:12:36
You'll have to disable one 256k resistor to enable the 4Mb upgrade if it hasn't been done before.
Check your logic board: for full 4Mb support, clip one end of R8 '256k bit'. Technically, R9 shouldn't be there. If it is, clip one end of that one too.
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Posted by: IlikeTech on 2016-12-04 12:04:04
Both were already clipped. Someone had tried to upgrade it in the past, and I think that why it had a memory problems.
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Posted by: IlikeTech on 2016-12-10 16:39:30
UPDATE: Replacing memory solved the problem. Mods, please close this topic.
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Posted by: BadGoldEagle on 2016-12-11 05:27:53
Great! Now you just need the keyboard and the mouse to go with it.
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Posted by: IlikeTech on 2016-12-11 05:30:54
Yeah! I posted a want to buy. Does 40 dollars sound reasonable?
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Posted by: Compgeke on 2016-12-11 12:45:48
I got my Plus keyboard off ebay for $30 late last year and the mice are a fair bit more common. Seems reasonable enough, however just note you might need to find a straight through 4P4C cable depending on whether or not the keyboard comes with one. The ones from a telephone headset are crossed and will most likely damage the computer, keyboard or both.
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