diff --git a/README.md b/README.md index 69a4a47..9e9bf96 100644 --- a/README.md +++ b/README.md @@ -4,11 +4,13 @@ ## Description The PC-09 will be a 6309 based microcomputer with a 74LS612 MMU, uPD72020 graphics and keyboard input. + The MMU will allow up to 2 megabytes of I/O to be paged into the address space. Pages are 4k. System storage will be paged into the address space as well, as it will be either EEPROM or flash. + The uPD72020 is a very advanced graphics chip for it's time, capable of accelerated drawing of lines, shapes, fills, and characters. It can be coerced into outputting a VGA signal at 640x480 and *maybe* 800x600. Prototype 1 is currently in progress. It will be a much simpler system. It will have no MMU, just the CPU, some RAM, some ROM, and a serial port. ## Progress -I had started wiring together a board for prototyping, but it was destroyed in hurricane Helene. I am now recreating it in schematic form in order to order a PCB. \ No newline at end of file +I had started wiring together a board for prototyping, but it was destroyed in hurricane Helene. I am now recreating it in schematic form in order to order a PCB.