FPGA VAX update
ajp166 at bellatlantic.net
Wed Nov 2 15:13:11 CST 2005
>Subject: Re: FPGA VAX update
> From: "Chuck Guzis" <cclist at sydex.com>
> Date: Wed, 02 Nov 2005 12:38:24 -0800
> To: cctalk at classiccmp.org
>On 11/2/2005 at 2:55 PM Allison wrote:
>>Ego a 16bit machine September 1985. There was another article whose
>>focus was microprogramming vs sequential machine control and that used
>>the TOY1 archetecture. There were others described in TCJ Dave Brooks
>>simplex III comes to mind. There are others.
>Hmmm, my recollection is of an 8-bit machine pre-1985. I recall that it
>was benchmarked against a 4MHz Z80A.
Not in byte or KB. Though there was an 8080 in 2900 form that was faster
than a real 8080.
>My first attempt at building a semiconductor computer was back in the late
>1960's. Using RTL (no DIPs, just TO-86 flat packs), I managed to get a
>12-bit ALU and accumulator done before I lost interest. I recall using a
>lot of diodes to save on logic costs. I think I still have a couple of
>the Fairchild 8-bit (1x8) addressable latch in a TO-100 package that were
>going to form the basis of my register file. I believe it required a 7v
Sounds like some of the old PMOS stuff.
The nicest one I've done in TTL was a Harvard machine 8bit instructions
and 4bit data path. Not fast nor exotic though I wasn't trying for speed
it was likely limited the most by the 2716 eproms and 2112 mods rams. It
was practical in that it was a fairly rich instruction set. Harvard
machines can really simplify the data paths.
>Anyone remember the Moto mw RTL "experimenter's pack" that was sold back
>then? That's when electronics companies still thought that appealing to
>the hobbyist was worthwhile...
Still have bits of the mW RTL from moto and also their ECL bits as well.
Did a lot of playing with those parts back when.
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