IBM XT 5162 Load issue

[acorn_1401]

First time turned on in years and years.

I have not changed the battery so I dont know if that helps or not .

On switch on I get hard drive sounds and the what I think is the ram testing going up to end saying

00512 KB ok

080000 0000 201 - Memory Error
- Parity Check 1
303 - Keyboard or system unit error
161 - System Options Not Set (run Setup)
601 - Diskette Error

(Resume = "F1" Key)

for a while it did nothing when I pressed any key but now it just beeps when I press any key but doesnt do anything else.

I did once get the same above just without the 601 but still didnt work with the keyboard.

Any help would be great.

 

[modem7]

First time turned on in years and years.

So multiple issues are not to be unexpected.

00512 KB ok

080000 0000 201 - Memory Error
- Parity Check 1

"080000" = Motherboard RAM error at address 512 KB.
"0000" = Usually an indicator that the parity bit is at fault.
"Parity Check 1" = Strongly reinforces the "0000".

The 5162 has 640 KB on the motherboard, per the diagram at [here]. In that diagram, the DIP (dual in line package) chips (blue in the diagram) are proving RAM between addresses 512 KB and 640 KB.
A parity check at 512 KB sounds like either:
- One of the DIL chips (most like one of the two storing the parity bit) is faulty.
- One of the DIL chips (most like one of the two storing the parity bit) has developed a poor connection with its IC socket.

So the first thing to do is re-seat the DIL chips. Per the diagram at [here], chips U1 and U4 are the likely culprits, but re-seat them all.

I have not changed the battery so I dont know if that helps or not .

161 - System Options Not Set (run Setup)

A 161 error is a 'bad battery' error.

Check the battery voltage. See [here]. After changing the battery, you will need to run the SETUP procedure in order to clear the 161 error, but it sounds like a keyboard related issue may, for now, stop you from doing that.

 

[modem7]

601 - Diskette Error

I did once get the same above just without the 601 ...

This might be due to a poor connection between the floppy controller and the ISA slot it is plugged into. So the first thing to try is to re-seat the card in its slot a few times.

It might be the floppy drive. During the power-on-self test, are you observing (seeing and hearing) the A: drive being accessed ?

303 - Keyboard or system unit error

for a while it did nothing when I pressed any key but now it just beeps when I press any key but doesnt do anything else.

A 303 error on an IBM 5162 is sure to be same as a 303 error on an IBM 5170.
See the 303 error description at [here].
Per that, do you still see the 303 when you power on the 5162 with the keyboard not attached ?

 

[acorn_1401]

Firstly, Thanks for getting back to me and also the amount of detail provided.

I have replaced the battery but as you said above without any change to the keyboard the error message still comes up. I cant be 100% sure that the keyboards (I have two of them) but the message still comes up if no keyboard is put in - not sure if that is normal or not.

I have reseated all of the chips to the side of the memory, removed the memory and put it back in. With no change in error messages.

I have removed all cards that are not needed (all but the video card / I have also swapped out the video card with no change. With everything removed I have checked over the board and cant seen any chips that might have caused issues and have also checked the PSU to see if it was a power issue not fully powering the whole board but still no luck.

mid post update. I am now only getting an

000000 4000 201 message. just saying that and not doing anything else at all.

 

[modem7]

I cant be 100% sure that the keyboards (I have two of them) but the message still comes up if no keyboard is put in - not sure if that is normal or not.

Abnormal. Without a keyboard, 301 is the only 300 series error that is expected. So this means that there is a keyboard related problem on the motherboard. Do you have a logic probe? Do you have the ability to solder in replacement chips?

I have reseated all of the chips to the side of the memory, removed the memory and put it back in. With no change in error messages.

mid post update. I am now only getting an

000000 4000 201 message. just saying that and not doing anything else at all.

RAM error: bit 14 at address 000000.

That corresponds to the SIMM designated S2. It was working at post #1. I suggest that you remove+refit S2 a few times, maybe blowing air into the SIMM socket in case a hair, or something else, is in the socket.