AMD bit-slice machines
bfranchuk at jetnet.ab.ca
Mon Jan 2 01:04:58 CST 2006
William Maddox wrote:
> For easy-to-decode, I can't think of anything that gives you as much
> power for as little work as the DG Nova. The Nova encoding, however,
> is very closely tied to a model datapath, as the arithmetic, logical,
> and shift instructions are encoded like the so-called
> "microinstructions" of the PDP-8. Most bits in the instruction
> correspond directly to control signals without any encoding at all.
> On the other hand, the Nova datapath is relatively straightforward to
> implement in TTL.
But looking at the schematics it also makes full use of 74172's , 8 x 2
dual port ram.
In fact someone sent me some 74172's but they got lost in the mail. :(
The lack of real hardware like TTY's and Core memory made up of so much
of the early
processors I/O that a full emulation is not possible. Lack of full
documention is the other
problem. My pdp-8 handbook covers TAD quite well, extended options for
multiply , or divide it does not. I could cheat and see what Simh does. :)
Ben alias Woodelf
PS. Since CPLD's now are 3.3 volts I can use ferro-ram memory after
getting a design
working @ 5 volts and standard memory.
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