15 Nov
2007
15 Nov
'07
8:52 p.m.
On 15/11/2007 18:31, Gordon JC Pearce wrote:
I'm considering writing a memory tester to help me
track down the faulty
RAM in one of the Superbrains I have. However, I don't (as yet) have a
way to write it out to disk. It would be too easy if DDT worked. What
I'm thinking is writing it out to disk on the PC, but then I only have
one working system disk so I'd need to format a blank disk too.
What we used to do for difficult systems, was to have a carrier board
with an EPROM programmed with self-contained test routines, selected by
a BCD rotary switch, and with a few address jumpers if necessary, to
plug into a boot ROM socket. Works even for an almost-dead machine, if
you code it right. The simplest test routine can be just "JMP here" to
test the bus, but we had video and memory tests too.
--
Pete Peter Turnbull
Network Manager
University of York