J. Guy wrote:
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You could look for an eeprom programmer but your time would be better spent looking for a P89C51Rx2 or T89C51Rx2 family chip that is programmable through the PC serial port using free software.

But the surplus mask ROM chips are nice for doing experiments. When the chip costs less than $0.5 (retail), you don't have to worry about damaging an expensive chip.

I use Siemens C501 chips ($0.40 each) and surplus EPROMs from the mid eighties for a lot of things... If you make a mistake you just fix it and install new chips. If the chip had cost me $20 (which is the approx. retail cost of many of the ISP chips) that could get expensive quickly... ;-)

Best regards,

Mikkel C. Simonsen