On 27 Mar 2007 at 18:22, Dave McGuire wrote:
It would be near-trivial to adapt the original
design to be driven
by a microcontroller, by the way.
As I recall, the programming algorithm was very simple and brute
force (fixed number of hits to get a 0). IIRC, there were later
programmers that applied a little intelligence to the operation.
One could easily build a programmer with little more than a counter
and a few gates and a control transistor for Vpp. The biggest
annoyance it seems, to me is the need for several supply voltages in
addition to Vpp.
Cheers,
Chuck