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Simple Apple I-inspired 6502 computer in Verilog
mangomon | ||
cpu6502.v | ||
font_cp437_8x8.v | ||
hvsync_generator.v | ||
LICENSE | ||
mango1.hex | ||
mango1.v | ||
README.md |
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!