Apple-2-HW/TommyPROM
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Add devices to 28C readme

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Tom Nisbet 2019-06-20 16:26:52 -04:00
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README-28C.md
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@ -11,7 +11,12 @@ In practice, the Xicor chips seem very forgiving of the timing, doing successful
# Solution
The TommyProm programmer uses direct port access to control the data bus and addressing shift register. This is much faster than doing individual DigitalWrite calls and allows the unlock and page write code to run comfortably with the tBLC constraints. It has been tested with Atmel chips and multiple batches of Xicor 28C256 chips with success.
The TommyProm programmer uses direct port access to control the data bus and addressing shift register. This is much faster than doing individual DigitalWrite calls and allows the unlock and page write code to run comfortably with the tBLC constraints. It has been successfully tested with the following 28C256 chips:
* Atmel AT28C256-15PU
* Catalyst/ON Semi CSI CAT28C256P-12
* Xicor X28C256P-15
* Xicor X28C256P-25
The capture below shows an unlock command sequence where the tBLC us within 80us for each byte.