Hi Jim and Mark. I became one of the testers. I accepted to receive and make a video about it. I didn't know about this discussion at the time, and that it was a quick mash-up, so this turned more into a pcb 1.0 review than an easy of use review. I've learned that the cartridge sets #EXROM or #GAME, and in some cases both (16k). Then, why is there a double throw jumper for #EXROM and #GAME? I had to bodge a link to tie the signals to ground. A jumper would just connect one of them to ground. For a 2764 rom that would have been ok I think, but not for 27C128 used for 16k game roms. Wizard of Wor cart (16k) is the passion for this project. I dumped the .crt file using cartconv.exe, using -t bin option and burned the 16k with minipro. No problems there. So now the A13 on the 27C128 banks the two 8k ROM areas. One chipselect/outputenable, two chipselect signals: Now the second thing I gather is that the PLA drives #CS and or #OE with #ROML or #ROMH. Those signals are dependent on #EXROM and #GAME. Because the overview doc I got from Mindflare says : "Single EPROM support - 2764 or 27C64 (1 x 8k bank) / 27128 or 27C128 (2 x 8k banks)", I decided to buy an 27C128. Here is the problem: a double throw jumper has no place on selecting #ROML and #ROMH for #OE. It's either #ROML or both, right? The second problem: I have a single chip, but two chipselect/output enable drivers #ROMH and #ROML. Someone in the thread suggested two diodes and a resistor. This was not everything needed to make it work. The #ROML was also connected to A13, the MSB of 27c128's address bus. Result: It turned into a bodge job where non of the components (diodes and resistors and links) has a place to go on the board other than into the air and then back again. Just saying. Anyway not criticising here. I know (now) that it was a 15min job. I did get Wizard of Wor to run today. Yay ! Hans / Bwack -- View this message in context: http://cbm-hackers.2304266.n4.nabble.com/Eagle-CAD-design-and-fabrication-of-C64-Plus4-cartridges-tp4656273p4662996.html Sent from the cbm-hackers mailing list archive at Nabble.com. Message was sent through the cbm-hackers mailing listReceived on 2017-06-03 17:00:05
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