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TRS-Ian
January 22nd, 2016, 03:39 PM
Hi IBMers, Ian from the Tandyland.

Just picked up a 5150 with 5151, it seems in good condition, and powers up. Gives a 3001 error and then changes to a Parity Check 1 message, and won't proceed. Its got the 64-256k motherboard, but don't know what other information you need to guide me on where to start.

Also does the PSU have paper-in-oil Rifa mains filter caps which need to be changed? As I may as will change them while I am at it...

Thanks in advance,

Ian.

Stone
January 22nd, 2016, 03:53 PM
3001 is the location of the bad ram chip. I think it's Bank 3, Bit 0.

modem7
January 22nd, 2016, 05:03 PM
Just picked up a 5150 with 5151,
Lots of 5150 and 5151 information at www.minuszerodegrees.net


Gives a 3001 error ...
3001 or 301 ?

301 is a keyboard error.
If the 301 is followed by by a byte (e.g. 301 A2), a stuck key on the keyboard is indicated (the byte indicating which key).
Otherwise, the possible causes of the 301 are listed in note 13 at [here (http://www.minuszerodegrees.net/5150/misc/5150_post_and_initialisation.htm)].


Also does the PSU have paper-in-oil Rifa mains filter caps which need to be changed?
Probably. I cannot be definite because in the supply lifetime of the IBM 5150, there was at least one change to the electricals/electronics inside the PSU. Other possible changes include non-RIFA caps.

modem7
January 22nd, 2016, 05:12 PM
... and then changes to a Parity Check 1 message, and won't proceed. Its got the 64-256k motherboard, but don't know what other information you need to guide me on where to start.
'PARITY CHECK 1' indicates a RAM parity error on the motherboard.

Before that, did you see a 201 type error, e.g. 4080 201 ?

TRS-Ian
January 22nd, 2016, 05:26 PM
Thanks guys, I had another look. The error reads: 3001 201

Ian.

modem7
January 22nd, 2016, 05:38 PM
Thanks guys, I had another look. The error reads: 3001 201
Bit 0 in bank 3, per what Stone wrote.
There is a bank/bit diagram for the 5150 at [here (http://www.minuszerodegrees.net/5150_5160/ram/5150_5160_motherboard_ram_layout.jpg)].