edn8usb

Tool to use the optional USB port on the Everdrive N8 board. Instructions on how to install the chip are available on the forum.

Binaries

A Windows binary is available from the Everdrive download site in the usb-tool.zip archive. A Linux binary can be obtained by running make.

Usage

Q: How to load rom for test ?

A: edn8usb testrom.nes

Q: How to load rom with custom fpga mapper for test ?

A: edn8usb edfc-fpga.rbf testrom.nes

Q: Where i can get drivers for usb port?

A: http://www.ftdichip.com/FTDrivers.htm

Q: Can i use USB port to transfer some debug data from nes to PC?

A: Yes

1. lda #1, sta $4400, lda #3, sta $4402 //magic initialization
2. now we can communicate with PC via $4401 also can be useful to check $4403.1 and $4403.2 before than read or write to $4401.

$4403.1 shows if port ready for read

$4403.2 shows if port ready for write

fpga bus_mode should be equal to 3(BMOD_REGS), otherwise access to custom registers will be closed.

From PC side communication interface looks like standard serial COM port.

License

The software is available under the CC0 license, a license equivalent to the Public Domain license (relicense, cached).

Contact

Contact me if you have some other questions about this stuff, or use the official Krikzz forum.

07.02.2013