Re: A2 ROMs are pin equivalent to what EPROM?

[shadoooo <shadoooo@gmail.com>]

As far as I remember, Apple II ROMS are 9316 compatible...
You can build an adapter simply using one or two empty sockets. You
can sock-in these sockets between the PCB and IC, and cutting,
isolating, soldering some wire-wrap between pins you can modify the
connections of some signals.
On the 2716-ROM connections, data and addresses, as well as VCC and
GND must go straight.
You must only play with the CS and /CS of the prom, to connect it with
the right polarity to the /CS and /OE of the 2716.
And of course isolate the VPP of the 2716.

If you just need to read the PROM on the programmer, I think you could
simply connect the data, address and VCC/GND, while you could
connect directly the CS to VCC and /CS to GND. In this way the PROM is
always enabled, and the data pins are always outputs, but who cares,
you are reading it one at once.
Or, you could connect CS of the PROM to VCC, and connect one /CS of
the PROM to the /CS of the 2716, the other /CS of the PROM to /OE of
the 2716.

See this connections:


       9316
A7   1 +-v-+ 24  Vcc
A6   2 |   | 23  A8
A5   3 |   | 22  A9
A4   4 |   | 21  CS/
A3   5 |   | 20  CS/
A2   6 |   | 19  A10
A1   7 |   | 18  CS
A0   8 |   | 17  D7
D0   9 |   | 16  D6
D1  10 |   | 15  D5
D2  11 |   | 14  D4
GND 12 +---+ 13  D3


       2716
A7   1 +-v-+ 24  Vcc
A6   2 |   | 23  A8
A5   3 |   | 22  A9
A4   4 |   | 21  Vpp
A3   5 |   | 20  OE/
A2   6 |   | 19  A10
A1   7 |   | 18  CE/
A0   8 |   | 17  D7
D0   9 |   | 16  D6
D1  10 |   | 15  D5
D2  11 |   | 14  D4
GND 12 +---+ 13  D3