Re: EPROM Programmer


"Bart" <consultec@xxxxxxxx> schreef in bericht
news:338d1$436d6806$d8442895$31755@xxxxxxxxxxx
>
>
> "Bart" <consultec@xxxxxxxx> wrote in message
> news:5c36e$436b4f57$d8442642$19490@xxxxxxxxxxx
>> I recently acquired an EPROM programmer that plugs into my printer port
>> on
>> my PC. The software allows me to take all the hex info off one chip and
> put
>> it on another, or edit the hex info (hex editor) as I guess most
> programmers
>> do.
>> Is there any "cool" stuff I can do with this thing? I fantasized taking
> the
>> EPROM off my 486 motherboard, copying it into a larger capacity chip and
>> adding DOS onto the chip but the Internet searches lead me to believe
> that's
>> apples and oranges.
>> Most of my searches tend to imply that programming an EPROM is
> proprietary
>> to a processor/microprocessor and not much mention of software to make
>> things happen between the two. Is there anything "neat" I can do with
>> just
>> my EPROM programmer without getting deeply involved integrating a
> processor?
>> Can I put a small database on an EPROM chip with my programmer, then
> mount
>> the chip on a small circuitboard that plugs into a serial/parallel port
>> on
> a
>> PC and access the data with a simple QBASIC program?
>> Hoping there is something else "cool" I can do with EPROM chips than
>> just
>> copy them.
>> Any help is appreciated,
>> Bart
>>
>>
>
> Thanks for all the replies, I'm wondering from Rich's reply that if
> I breadboard the EPROM for reading, and hook up a 4-bit binary
> counter to the inputs at say 1 herz, then whatever is programmed
> (binarily speaking) at address zero will fire corresponding
> output pins (the one's, not zeroes), and a second later fire output
> pins corresponding to data programmed in address one, toggling
> each second through to address 15. I could program one's and
> zeroes in the proper spots at each address to control a segmented
> LED to change character every second. If not enough milliamps
> for LED's then I could incorporate transistors at each output pin
> to fire the LED's?
> Am I thinking correctly on this? Hope so as this could open
> up a whole new area for me.
> Any responses appreciated,
> Bart
>

Your thinking is correct, but you have to pay attention to some details. So
you connect the outputs of your counter to the addresslines A0-A3 of the
EPROM and all other addresslines to ground. You also have to pay attention
to the current that can be drawn from the outputs of the EPROM. Different
types have different specifications. You may need to read the data***.

EPROM outputs can often sink more current then they can source. So it may be
interesting to connect a LED with its seriesresistor between Vcc and the
output. Be aware that a zero on the output lights the LED in this case.

You only use a very small part of the EPROM in this example. Other
addresslines may be used for longer sequences (with a five or more bits
counter) or to make a choice between different sequences.

If you have more questions, feel free to ask here. It's what this group is
meant for.

petrus bitbyter



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