Hi to all members:

I came across this test circuit in Circuit Cellar Project file volume 1 which I purchased back in 1990 with software on those 5 1/4" disks. Any way heres the schematic. I also called circuit cellar engineering dept who said I could only post the schematic. They give permission 1-8-2007.



At that time I had no real interest in LCD's. Now I do. I can not post source code but they said I can talk about LCD tester. So here's my question. How do use the wr rd E strobe for LCD when their is none on 89c4051. All I want to do is make a smaller microcontroller unit to do the same thing. What it does is it teaches you how to program any LCD that works like Hitachi type display. If you look at 80c31 in url I posted pin 16 goes to a 2 input nand gate of wr. And pin 17 rd goes to the other input of nand gate. Output goes to E strobe on the LCD. The 89c4051 is core part to 80c31 2 ports instead of 4 ports. The 89c4051 uses 4k flash memory. Except that 89c4051 is smaller 20 pin and 80c31 is 40 pin they function the same. The source code is 25 pages but well commented.
I don't know if I can do this but could some of the members give their opinions. I never tryed anything like this before I have feeling this is engineering nightmare. When I spoke to Circuit Cellar Ink on the phone they said they no longer have the writers address for engineer Timothy J. Stacey that designed this circuit.

Thanks inadvance to all members.

Best regards,

Ralph Sac