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Date: Wed, 25 Sep 2002 11:49:24 +1000
From: Andrew Tweddle
X-Mailer: Mozilla 4.79 [en] (Windows NT 5.0; U)
Subject: Re: What would you want in an EPROM programmer?
Organization: Client of Alphalink Australia Pty. Ltd.
Al Borowski wrote:
> I'm in the middle of designing an EPROM programmer. At the moment,
> it's based on a PIC16F877. The only other IC's involved are a few 4040
> counters for addressing and a MAX232. I plan to write some software in
> java to controll the thing. I'll have 32 address lines, and several
> programming methods (I'll mainly use the PRESTO II one). However, I
> have never designed a circuit contai an EPROM - This project is just
> for fun :-)
> I have a few questions:
> 1. The programming voltage is 13V - is this OK for most modern
> EPROMS's? I could make it varible by the PIC, but I don't know if it's
> worth the effort.
> 2. In order to allow many devices to be programmed, I was planning on
> having a header, like an 8 bit ISA slot, on the programmer. Different
> daughterbaords for different devices could be placed into this header.
> I was planning on getting the PIC to recogonize which daughterboard
> had been inserted and adjust the programming parameters accordingly.
> Does this sound like a good idea?
> 3. Since FLASH ROM's are popular nowadays, would it be useful to
> include flash rom support into this thing?
> 4. Finally, what LED indicators would be useful? I was thinking power,
> RS-232 comms and Write.
> Thanks for any suggestions...
> Al Borowski
> Official Sci.Electronics.Design Kook since 25 September, 2002 :-p
How's about adding TTL logic reading/verifying. I use this on some
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