For those wanting to build the PSX64 interface, the schematics are now online. The plans include an ICSP port for uploading firmware to the Atmega 8 MCU. Please note, these plans assume the DIP package version of the Atmega 8 – the pinout is different for the surface mount packages. Firmware will be online within the next day or two.

If you don’t have any kind of Atmel programmer, you can build a really cheap parallel programmer using these plans. It works like a champ for programming the Atmega8.