1702A programming (was Bugbooks - Mark 80 )

Programming the 1702A's Well in some sence I have a little egg on my face. The programmer I have was infact designed for 1702A's but doesn't do it following the specifications. First 1702 versus 1702A's. As was mentioned, the 1702's couldn't take the same duty cycle by 10X. It isn't true that you can take a 1702 programmer and program 1702A but you can take a 1702A programmer and slow down the pulse rate and program 1702's. The difference is that the 1702A's require an address complement phase at the start of the cycle. This phase doesn't effect the 1702's so the only issue is repeat rate. Now to the issue with my MP7-03 board. The first PROM I tried was either originally blown or I blew it out. The programming voltage was about 53 volts. I cranked it down to 47 volts and tried another PROM and it now works fine. There is still the part I don't understand. The specifications for programming the 1702A show a setup time for the complement address at the start of 25 microseconds. The MP7-03 is violating this by quite a bit. The Vgg and Vdd are never pulsed to Vcc. The sequence is: step0: time before zero Vcc 5V Prog 5V Vgg -9v Vbb 5V Vdd -9v address lines true and 0/TTL levels Data lines true and 0/TTL levels step1: time 0 Vdd to Vcc-47volts Prog to Vcc Vgg to Vcc-35volts Vbb to Vcc+12volts Address lines to Vcc and Vdd levels but complemented Data lines true and Vdd/Vcc levels step2: time 50 microseconds Adrress lines to true, Vdd/Vcc levels step3: time 150 microseconds Prog to Vdd step4: time 2.5 milliseconds Prog to Vcc step5: time 2.9 milliseconds Levels to the same as Step0 Repeat every 15 milliseconds for 30 cycles. If you'll plot this out, you'll see that there is zero complement address setup time but the transition from 14 volts Vcc-Vdd to 47 volts Vcc-Vdd may compensate for this. Without understanding the internals, I couldn't say but it is not like the specifications. Part of the reason I'm posting the sequence used for this tester is that it is a little simpler than following the exact specification and may help some home made programmer. I also ran some AMD 1702A's through it without problems. The good news is that I was able to program three backup PROMs for my SIM4-01 board and I ran them to verify that they where correct. Thanks for the help from Jonathan Levine who sent me a copy of the document that made me realize that the firmware and hardware should program 1702A's even if the specs didn't match. Dwight