a classiccmp electronics project?

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Fri Jul 30 16:46:47 2004

>
> Tony wrote...
> > Yes, modern SRAM is fast enough. But that's 'easy' in theory. Firstly you
> > have to have some way of switching the SRAM between the device and the
> > loader
> Dual port SRAM is one answer. Or, I'm not sure what the power on test in

Sure, but have you looked at the price :-)

> microcode does on the MX's, but my guess is it doesn't touch the add-on
> microcode. The loader roms probably aren't touched either until called from
> the front panel. If the RPL stuff is turned on, it may though. I think the

OK. I was thinking about the microcode ROMs in an HP9810 (somethign that
_I_ am working on, and those are most certainly 'hit' as soon as INIT is
deaseserted and the microocde program counter starts to change. I prefer
to think of general-purpose solutions (i.e. somethign that will replace
every 256*4 ROM), rather than soemthing that works only in specific
machines under specific circumstances.

-tony
Received on Fri Jul 30 2004 - 16:46:47 BST