FPGA VAX update, now DIY TTL computers
ploopster at gmail.com
Thu Nov 3 10:04:58 CST 2005
> Chuck Guzis wrote:
>> Consider the very old Packard Bell PB250--22 bit words, fewer than 400
>> transistors and 2500 diodes, 63 instructions. Power consumption about 40
>> watts, exclusive of I/O:
>> The trick, of course, is to use bit-serial methods. It seems to me that
>> one could greatly simplify construction of a homebrew machine that way.
>> We're not doing this for speed, right?
> That is interesting reading. Are there any of the large 48 bit
> processors still around?
> Also TTL and memory is easy to use in 4 bit sizes, a odd size like 18
> bits is not so
> easy to work with.
How does parity memory work? Must one use the extra bit for parity or
could one use it as a ninth data bit?
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