23 Feb
2006
23 Feb
'06
1:07 a.m.
On 2/23/06, Don North <ak6dn at mindspring.com> wrote:
Guy Sotomayor wrote:
For an 11/44, you could do just a dual slot card that goes in a memory
slot (which has 22b address available) and an SPC slot (to get the DMA
lines) but this would be a hex card. To read/write memory, you would
need to be a 22b DMA device, which I'm not sure the 11/44 can handle
(ie, the CPU may always drive the upper 4 address lines and not provide
for 22b DMA device). It may work, it may not. Certainly not what DEC
designed for.
This is what I term the "Computer Scientist's" solution.
On the other hand, writing a bit of C-code for a PIC processor that
handles the console switches and talks to the ASCII console via RS232 is
a piece of cake.
This OTOH is an "Engineer's" solution.
Conclude what you like. :-)