Re: 65802 problem

[David.Empson@bbs.actrix.gen.nz]

In article <22JAN199310075283@rigel.tamu.edu> a0m2504@rigel.tamu.edu (AKITOMO MORITA) writes:
> Is anybody out there having problems using a 65802 inside a //e inplace of the
> 65C02?  I'm having trouble using the 65802 and running an old (OLD) Rana Elite
> 5 meg hard drive.  I've tried using a 65816 (since there was talk of this
> earlier) but I had the sam problem with it.
> 
> The hard drive has a card with ROM and RAM on it.  In $C800-CFFF, the banks
> $CC00-CFFF are used for ROM, and the other 1k can select either another ROM or
> up to 7 1k RAM by reading $c0f8-c0ff (when the card is in slot 7).  The problem
> is that the demultiplexer is getting the wrong lower three bits and is 
> selecting the wrong set of RAM or ROM.

I can't think of any reason why the 65802 would have problems.  It
might make sense if the 65C02 didn't work either.  Presumably the RANA
drive works fine with a normal 6502?

> On another note, I noticed that the //e board has four silver(?) contacts on
> the lower left-hand corner.  Can I use these to power a logic probe?  In other
> words, does anybody know the signals or purpose of these contact?

They're called the 'burn-in power pads', and they contain the voltages
from the power supply (I'm not sure which order, but it includes
Ground, +5, +12, -5 and -12).
-- 
David Empson

Internet: David.Empson@bbs.actrix.gen.nz    EMPSON_D@kosmos.wcc.govt.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand