11 Apr
1999
11 Apr
'99
9:51 p.m.
<You can build your own in an FPGA for something on the order of 2500 gates
Gates or CPLDs? Big difference there. I do ahve a few 3030s here and can
get 4000 seris. But why would I do it.
then again I have an early 80s project that was a z80 built in 2901s...
at a time where a 10mhz z80 was an extreme machine.
Allison
12 Apr
12 Apr
12:38 p.m.
New subject: stepping machanism of Apple Disk ][ drive (was Re: Heatkit 51/4
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3:19 p.m.
New subject: stepping machanism of Apple Disk ][ drive (was Re: Heatkit 51/4
Talking of things like that, I seem to remember that
Signetics sold a
demonstration board based on the 3001/3002 bitslice chips that ran 8080
code a lot faster than a real 8080.
Those were indeed fast (about 4-5x) and the firmare was extensable, I'd
love to find one.
Then there was the Tektronix 'almost 6800'
used in the 4052, etc. It was
a board of 2901's, etc and ran an instruction set that was almost upwards
compatible with the 6800 used in the 4051 (IIRC the DAA instruction was
The moto 6800 was protoed using 2901s. It would only need two.
Allison
3:42 p.m.
New subject: stepping machanism of Apple Disk ][ drive (was Re: Heatkit 51/4
allisonp(a)world.std.com wrote:
Hi
Most use programmable parts to make specialized processors
now days. When I was with Intel, we had a controller card
that used 3001's as the control processor. All I remember
was that I wish they'd used the 2900 family sequencer instead
of the goofy thing Intel had. Programming was almost impossible
and just trying to follow someone elses program was a
major effort. It made it real difficult for someone to
copy your code without being obvious about though.
Dwight
Talking of things like that, I seem to remember
that Signetics sold a
demonstration board based on the 3001/3002 bitslice chips that ran 8080
code a lot faster than a real 8080.
Those were indeed fast (about 4-5x) and the firmare was extensable, I'd
love to find one.
Then there was the Tektronix 'almost
6800' used in the 4052, etc. It was
a board of 2901's, etc and ran an instruction set that was almost upwards
compatible with the 6800 used in the 4051 (IIRC the DAA instruction was
The moto 6800 was protoed using 2901s. It would only need two.
Allison
3:53 p.m.
New subject: stepping machanism of Apple Disk ][ drive (was Re: Heatkit 51/4
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allisonp＠world.std.com -
ard＠p850ug1.demon.co.uk -
elvey＠hal.com