[N8VEM: 19427] eprom programmer for xi8088...

[Andy Smout]

anyone working on an eprom programmer board project in the works for the xi8088 ?
I am slowly working on a paul stenning programmer project as an external board lpt connected, but it occurs to me this might be suitable to convert to a xi8088 isa bus pcb. I have sw written in basic that I am modifying to suit (partially done).
any thoughts ?
anyone have an isa bus programmer with sw for sale that would suit 2708/2716 etc 3 voltage eproms and tms eproms ?

[Sergey]

Andy,

Is there any particular reason you want an ISA based programmer
specifically? If you just need a programmer - there are a few popular
models on eBay (e.g. TL866A/CS), that cost less and would be more flexible
than a home made one.
Does it have to be ISA based? If I'd build my own programmer, I'd use
something like Arduino board to drive it. It would be easier to program and
interface to a modern PC. And there is a lot of I/O flexibility as well.
If you still want to build an ISA based programmer, you can look at Willem
design, and perhaps convert it to an ISA interface. I'd do something like
this:
- Several 8-bit latches / transceivers. At least one of them would be for
the data bus (or two if 16-bit support is needed). At least 3 latches for
address (so it would give 24 address lines). One latch to generate control
signals (/CS, /RD, /WR, Vpp gating, etc.) That latch also can be used to
program I2C/SPI/PIC/ATmega/ATtiny using bit banging. Compared to parallel
port programmer that has to rely on only three I/O ports (2 output, 1
input), on ISA you can have all latches/transceivers directly addressable
in CPU's I/O space.
- Vpp / Vcc source. Willem has a jumper-configurable Vcc/Vpp supply, you
can use it as a reference.

Thanks,
Sergey

Post by Andy Smout
anyone working on an eprom programmer board project in the works for the xi8088 ?
I am slowly working on a paul stenning programmer project as an external
board lpt connected, but it occurs to me this might be suitable to convert
to a xi8088 isa bus pcb. I have sw written in basic that I am modifying to
suit (partially done).
any thoughts ?
anyone have an isa bus programmer with sw for sale that would suit
2708/2716 etc 3 voltage eproms and tms eproms ?

[Andy Smout]

hi sergey! My need for a 3 supply rail programmer (2708's, TMS 3 rail etc)
is to support/maintain some old arcade game pcbs. I do have a willem
programmer but of course no 2708 or tms 3 rail supply support.

I found only a few magazine designs for 27xx/25xx programmers including a
2708 design (that was for a diff micro architecture than PC, may have been
s100 ?) and the Paul Stenning design (serial interface, original software
is written for QBasic, but support only for single supply rail 2716
upward). I am reworking the Paul Stenning design & sw to enable support
for 3 supply rail devices (2708 etc), but it was shelved while I searched
for a cheap old programmer. the desired combination of old, hardware,
software, documentation & schematics is difficult to achieve & New with 3
supply rail and 2708 support is achievable, but expensive!

So when I discovered your XT project it struck me as a perfectly suited
platform for such a programmer as it already has the three supply rails
for 3 rail EPROMs and the QBASIC software will run on, therefore a suitably
modified design would run ok!

So I was hoping someone may have already designed one :)