The final word on the 68HC05: Quote: "..they were one-time-programmable. Some had quartz windows versions that could be erased with a UV light. The MC68HC908 series are code compatible with the '05 and are FLASH.." From Roger Shaefer, owner of website dedicated to this chip.
68HC05 - Mask programmed ROM version
68HC705 - EPROM, UV erasable
68HC805 - EEPROM, electrically erasable.
There's a version of the 68HC705 that doesn't have the quartz lid. It's known as One-Time-Programmable (OTP).
The Mask programmable are the cheapest but minimum order is usually 10,000 parts.
The next cheapest is the OTP version of the 68HC705. These are used for small production runs.
Years ago I bought a cheap programmer that Motorola sold (for $68.05). It's real fun to debug as you basically have to incorporate any debugging functions into your target code. Like making it beep (if there is a beeper) when you reach a certain point in the code.
p.s. I think the windows are just glass now. Either the changes in the light spectrum used or improvements in glass brought it on. The reason for using quartz originally was that it passed the UV light much better than glass.
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Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting
"I'm a designated driver on the Information Super Highway"
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