Parallel Port eprom programmers - suggestions

Roger Heflin rah at horizon.hit.net
Tue Feb 9 16:05:20 GMT 1999


On Tue, 9 Feb 1999, Andrew K. Mattei wrote:

> >  Are there any other
> >  parallel port eprom programers that others have used?
> 
> Well, this is the Do It Yourself list... ;)
>

I am lazy and those are fairly cheap and I really cannot do a better
job than the ones I can buy.   On reprogramming my prom I am real sure
I can do a better job than the tuners, and can also do some things the
tuner won't or cannot do.  And I also have need to read some much
larger eproms for some people I work with.

 
> My justification is that my wife will let me "babysit" the new son, and
> tinker with electronics all I want, but I'd get strung up if I spent
> $200 on a programmer... So...
> 
> I'm now rolling my own LPT port programmer. Have the hardware design,
> and have been flowcharting the software (Qbasic, of course!). Uses (2)

Qbasic is nice for simple tasks.

> 74HC4040 12-bit counter IC's (for addressing), a couple 74175's (latches
> for outputs), a couple 74125's (latches for inputs), a 555 (for the 50
> usec programming pulse), some dip switches, and some voltage regulators.
> I'm building it for 128k and 256k eproms, but it's adaptable. ;) I found
> a design on the 'net, built it, but have had mucho problems with it.
> Hopefully this "adaptation" will fix those problems.
> 
> Hope to have it documented in a couple weeks. I have all the parts, it's
> just a matter of rolling it together. And unlike others, this should
> work on all standard parallel ports. I plan to use an old 8088 Toshiba
> laptop to run it. ;) "The diskless wonder". Anyone got any 3 1/2" 720k
> floppies laying around? (JOKE!)
> 

I was originally using a T1000 before mine broke and I had to replace
it.  I still have it somewhere.


The parallel port programmer I found claims to work on almost any
parallel port made.  


			Roger




More information about the Diy_efi mailing list