Hello

This is my "hello world" NES rom for debugging and testing purposes.

Install

You'll need

• cc65
• python >= 3.10
• bash
• flips

bash build.sh

hello.nes is the rom

fifo_testrom.py is a b85 encoded bps patch against a file of all zeroes the same length as the rom. Used for python-edlinkn8

Menus

Main Menu:

>RAM Read/Write

 Everdrive FIFO Test





 $00

The counter displayed at the bottom is there to provide feedback that an action occurred.

RAM Test Menu:

>$0000 $00 $00

 Write

 Read

00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00

 $00

Inputs (top row) are startingAddress, startingByte & count.

If count is between $01 and $FF, selecting Write will write to a stretch of ram at startingAddress of length count. The first byte will be startingByte and every subsequent byte will be startingByte incremented.

Selecting Read will read 16 bytes at startingAddress

Everdrive FIFO Queue Test Menu:

>Send $00 count $0000

 Read $40f1=$00

 Read $40f0=$00

 len(queue)=$0000

 $00

Inputs are byteToSend and count. If count is greater than zero, selecting Send will send byteToSend to the queue until count is reached.

The two Read options will read and display FIFO_STATUS ($40f1) or FIFO_DATA ($40f0)

Selecting len(queue) will read FIFO_STATUS, if the value read is FIFO_PENDING ($41), then FIFO_DATA will be read and a counter will be incremented. This process repeats until FIFO_STATUS no longer reads FIFO_PENDING. All bytes read from FIFO_DATA are discarded.

To Do

• Fix the graphic glitch on startup
• Use nametable to look more interesting
• Sprites for cursors
• Render queue
• Beeps