Does anyone have any experience with the 16C84 bulk erase feature? I cannot
get it to work properly. I have been through the data book with a fine tooth
comb and cannot fine anything to help me. I have all other programming
aspects working perfectly and the routines are well tried and established.

This is my proceedure:

Enter programming mode
send command: 09 (Bulk erase program area)
send command 08 (begin programming)
Wait 10mS

I have tried both serial and parallel methods but I get a variety of stange
effects. Usually something happens but I'm expecting to see a lovely display
full of 3FFFs but instead I get 0000 often, and other strange values like
02B8, 1004 and others.

As I am well experienced in all aspects of programming these suckers, I
can't understand why this has got me beat.

Does anyone have an idea to help?