Mango One

A simple 6502-based computer inspired by the Apple I, implemented in Verilog.

For the 6502 CPU, we use an open-source model created by Arlet Ottens.

The Mango One's memory map is very similar to the Apple I:

Start	End	Description
$0000	$0FFF	RAM
$D010	$D013	6821 PIA (keyboard, terminal)
$FF00	$FFFF	Monitor ROM, CPU vectors

The monitor program in ROM, MangoMon, is a custom 256-byte monitor ROM with just a few commands:

Command	Function
R aaaa	Dump memory at address $aaaa
Enter	Dump next 8 bytes
W aaaa bb	Write byte $bb at address $aaaa
G aaaa	Jump to address $aaaa

You can open this project in 8bitworkshop and try it out!