21 Nov
2006
21 Nov
'06
10:17 a.m.
In article <45633FEF.7000504 at mindspring.com>,
Don North <ak6dn at mindspring.com> writes:
The power
supply issue can be solved by a small linear regulator, but I/O level
compatibility
is a stickier problem.
You might need to homebrew a few transistors to get the right logic
level. IIRC, anything can be done with discrete transistors since the
logic gates are implemented that way on the chip anyway :-). With
discretes you should be able to get any voltage level you need,
hopefully staying within the rise and fall-time specs. Although I
would think its easier to meet vintage specs nowadays with current
transistor offerings.
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