6541 Mystery board. Pictures. By Lee Davison.

The missing chip. I now suspect that this is a Western Digital WDxxxx floppy disk controller or equivalent, though I don't know exactly which one.

This is the only identifying mark on the board. There's not even any helpfull messages in the EPROM to give any further clue.

It's possible that this is a "Sigma Designs Controller" floppy disk interface. I've found some reference to boards with the SDC prefix that are disk controllers but nothing exactly like this.

These are the only two chips that have labels. The only extra information that these have is that the EPROM is possibly dated 14th February 1986 and, if so, was probably made by an American company.

Last page update: 21st February, 2005.

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