Commodore PC SL386SX-16 boot problem 4-1-3-1 beep sequence

[ppieczul]

Hi,

I am restoring an old Commodore PC SL386DX-16.
It was completely dead, so far I replaced the 82C215 address/data buffer chip and fixed a lots of broken traces on the board.
Now it started to boot BIOS and immediately reports an error with a beep sequence 4-1-3-1 and this sequence is repeated all the time.
You may take a look what it looks like: https://youtu.be/3XxgS3ToA20

This seems to be yet before ISA bus or any of the serial/parallel/floppy chips are initialized.
4-1-3-1 sequence is not documented on the Internet nor in the service manual. Service manual says this is a Commodore version of the Phoenix BIOS. The EPROMS say: V1.03, although it may refer to the Commodore numbering scheme.

Any hints what this could mean? This would help me tremendously in moving further, instead of checking component by component.

Thanks
Pawel

 

[ielber]

when you disconnect all IDE and floppy devices, you get the same beeps?

 

[ppieczul]

Yes, the IDE, FDD, serial and parallel are disabled with jumpers.

 

[ielber]

no try to disconnect all IDE and floppy and try