28 Aug
2007
28 Aug
'07
7:27 p.m.
On 8/28/07, Allison <ajp166 at bellatlantic.net> wrote:
I can entirely appreciate that. From reading the docs, there's
nothing magical on the software end, so I'm sure the requisite logic
is in place to supply the write pulse and to gate in Vpp and twiddle
the OE/ and CE/ pins.
-ethan
As for a
modified socket, I have an old "Z-80
Starter Kit" SBC that happens to have a built-in EPROM programmer on
one of the three ROM sockets. There's a toggle switch to disconnect
the programming voltage, but once enabled, you simply write to the
address range of that EPROM socket, and after the data are presented
to the ROM, the circuit wiggles the programming pin to write the
EPROM.
It also requires the "write pulse" to be 50milliseconds long. Write
is accomplished by supplying VPP (12, 21 or 26V version dependent)
then playing the OE/ and CE/ pins.