PCjr (Was Re: IBM PC hacking)

Sat Oct 1 14:31:41 CDT 2005

On 10/1/2005 at 10:00 AM Fred Cisin wrote:

>The XT HD controller was a relabelled Xebec.

I've no doubt that Xebec made the 10 and 20 MB adapters for IBM (even the silk screen legends correspond to Xebec convention).  But does the IBM 10 MB adapter correspond to a standard Xebec part, or were there changes incorporated into it (beyond the BIOS signatures, that is)?  My 10 MB Xebec adapter built in early '85 has a different layout from either 10 MB or 20 MB IBM parts.

FWIW, the Z80A on the 20MB adapter is so labeled in the IBM O&A reference manual.

Cheers,
Chuck