Tag Archives: programming

BBC Micro, Electronics and Computers, General, Posts, Programming

Programming a TMM27128D with the TL866 EPROM Programmer

Although the TMM27128D (Toshiba) UV Erasable EPROM is not listed within the menus of the Xgpro software for the LT866ii Plus EPROM Programmer, I found that I was able to program a blank chip by selecting (AMD) AM27128A, unchecking the “Check ID” box, set VDD write to 5V and adjusting the VPP voltage to the maximum 18V. Note 18V is a little lower than the specified 21V, so while it worked and passed verification, it might not be the best solution. Good if you’re stuck in a fix though.

Electronics and Computers, Linux, Posts, Programming

Programming a AT28C64 with a TL866ii Plus

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Quick note to help other people in a similar situation…

I was trying to burn the ROM form my breadboard Z80 project based on Grant Searle’s design, but was having verification errors when using either Xgpro running in Wine (on Linux) or minipro from the command line. I was trying to burn the ROM to a 64 Mbit AT28C64 (Atmel) chip.

TL718

In frustration, I tried selecting an equivalent AMD part, the AMD28C64A, and it worked first time. This is after hours spent trying to get the other settings working, worrying I hadn’t done something right, trying to change the programming speed and worrying that my chips were dead.

Hope this note helps someone else. Not the best first experience with the device. Even more annoying that it works just fine with the AT28C64B.

Here are some of the various errors I was getting :

Verification failed at address 0x0001: File=0xC3, Device=0xFF

ERROR! CODE Address0x000001 Buf_Val:0xC3 IC_Val:0xFF