I soon found other KIM owners wanted this board, so now I make them available as either a blank board or fully assembled. With the success of this board, I created an I/O board and am working on more projects. Buying a board will encourage my behavior!
Memory Test
I wanted a better memory test to check out the boards, so I pulled together some existing code to create one. It does a 9 bit pattern, which means the pattern repeats every 9 bytes, which makes it easier to detected shorted/open address lines. It's based on works of others, as you'll see in the comments The test continues to run until it detects an error or you press the RS button on the keypad. After each successful pass, it prints a simple "." to the TTY. If it finds an error, it will display the address, the value expected and the value read. The whole thing fits into one page, which is page 2 by default ($0200 to $02FD).
The memory can be selected 1K at a time using the KIM's K1, K2, K3 and K4 pins on the Application connector. Bringing all four to this board will give you contiguous memory from $0000 to $13FF (5K total). It's a very simple board, so it anything goes wrong, it's easy to figure out the problem. The blank boards are made by a professional shop not etched in my bathroom sink.
Board Availability
I only offer the board fully assembled or as a blank board. Putting together kits took more time than just building them myself. Current prices:
- Blank board: $25
- Assembled: $45
Each order also has a $5 S/H charge regardless of how many items were purchased.
Both include documentation and schematics. The assembled boards are tested for several hours prior to shipment. Generally speaking, either blank or assembled boards ship the next business day.