20 May
2014
20 May
'14
6:34 p.m.
On Tue, 20 May 2014, Tony Duell wrote:
[1] It is possible to ad a singel TTL IC to disable
the normal ROMs for
the last 8K words and map in 8K EPROMs (2764 type) inserted in the spare
sockets on the motherboard.
My 5150 had one spare ROM socket. I put in an optional enhancement ROM
from MBI.
My 5170s did NOT have any spare ROM
sockets. Or did you mean the sockets
used by the BASIC ROMs?
But, YES, many of my aftermarket XTs and ATs had extra sockets.
Or were there more variants of the 5170 motherboard than I was aware of?
Hard drive spinning up does not check both 5V and 12V, and power LED
doesn't mean much.