On Fri, 4 Jun 1999, Oleg Perelet wrote:
> >Meaning don't do a far
> >jump and don't try to access your boot rom relative to DS!
> .....
> AMD uses high memory aliasing, at reset time two 64K blocks
> are enabled: 3ff0000-3ffffff and 00f0000-0fffff which is aliased
> boot vector. At reset CS is set to 0f000 and upper address lines
> are asserted.
Are you sure? Admittedly, I haven't worked with this particular part, but
this sounds very weird. No Intel chips do it and I can't see any reason
why such an approach would be desirable. Working with the special CS
selector is not exactly hard, it just requires using segment overrides.
Most BIOSes create RAM shadows of themselves in the lower meg or reprogram
the chip selects themselves to do this.
--
"Love the dolphins," she advised him. "Write by W.A.S.T.E.."
