Re: [WORKING] Simple 6502 SBC from scratch (65ad02)
Posted: Thu Apr 13, 2023 10:46 pm
There are so many manufacturers of these LCDs, and it's unfortunate that after all these decades, they still have not standardized on a pinout. I don't think it has anything to do with China though, since I saw the problem in the 1980's when these things were mostly made in Japan and maybe Taiwan. I made myself an LCD tester that accommodates various pinouts. The 40x4 is sure nice though, and I like how you have it mounted above the board and its components. There were also 80-column LCDs available in the tail end of the typewriter market when they made them so you could type a line and fix mistakes before it went on paper; but the availability was brief, as computers were coming within financial reach of the common household.
That tall, green ZIF socket is convenient, but I've had trouble with their lack of dependability. Too often, there's a poor contact, and I have to release the lever and try again and again, or, when the EPROM is in there supposedly tight, I have to scoot it back and forth sideways so the scrubbing kind of cleans up the contacts. I have never had that problem with the low-profile blue ones.
And again: "Flashing" is what you do to memory that's flash memory, not EPROM. EPROM is not flash. You just program it. You don't flash it.
That tall, green ZIF socket is convenient, but I've had trouble with their lack of dependability. Too often, there's a poor contact, and I have to release the lever and try again and again, or, when the EPROM is in there supposedly tight, I have to scoot it back and forth sideways so the scrubbing kind of cleans up the contacts. I have never had that problem with the low-profile blue ones.
And again: "Flashing" is what you do to memory that's flash memory, not EPROM. EPROM is not flash. You just program it. You don't flash it.