5 Apr
2005
5 Apr
'05
4:53 p.m.
On Apr 5 2005, 19:21, Allison wrote:
The state machine is a simple but programable non-von
cpu that can do
the needed tasks to execute complex command to seek, read or write
a sector. The RX02 is a 2901based bitslice that does more as it
has to do the needed tricks for DD format.
Ah yes, I'd forgotten that. Thanks for reminding me where I'd seen
another 2901!
Welcome back, by the way :-)
--
Pete Peter Turnbull
Network Manager
University of York
6 Apr
6 Apr
4:14 p.m.
On Apr 5 2005, 19:21, Allison wrote:
It was the first 2901 'system' I ever worked on. I can remember some
train journeys between Bristol and London where I sat commenting the
microcode (I'd dumped out the ROMs -- remarkably easy on the RX02 since
grounding an IC pin that was otherwise pulled up to +5V disabled the
sequencer outputs and let you take over the PROM address lines). I wrote
a disassembler, produced a listing, and spent quite a time commenting and
understanding it. I learnt a lot from that.
-tony
The state machine is a simple but programable
non-von cpu that can do
the needed tasks to execute complex command to seek, read or write
a sector. The RX02 is a 2901based bitslice that does more as it
has to do the needed tricks for DD format.
Ah yes, I'd forgotten that. Thanks for reminding me where I'd seen
another 2901!
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ard＠p850ug1.demon.co.uk -
pete＠dunnington.u-net.com