An emulated 8-bit computer based on an Arduino.
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Many op-codes have not been included yet, however there are enough to write some simple programs.
I will try to have an example for every op-code.
Examples:
Load: Put a 3 in register A
Mnemonic: Op-code:
LD A,3 0x3E, 0x03
Add: Add 2 to 5
Mnemonic: Op-code:
LD A,5 0x3E, 0x05
LD B,2 0x06, 0x02
ADD A,B 0x80
Subtract: Subtract 3 from 5
Mnemonic: Op-code:
LD A,5 0x3E, 0x05
LD B,3 0x06, 0x03
SUB B 0x90
The emulator now lets code access the SD card using I/O instructions. One of these instructions tells the Arduino to load a binary file into the emulated memory. This is nice, however the memory array is stored in RAM, so it is very limited in size. I will likely switch to using flash instead.
I was able to blink the LED on pin 13 using my emulator and Z80 compatible op-codes.
It should be able to use anything that you could map to an array. I haven't worked on this for a while, but I've been thinking about using the EEPROM for ROM so you could just burn a HEX or BIN file into the EEPROM.
Ryan Gass
Joshua Snyder
Erturk Kocalar
tehaxor69
Hi Ryan, have you tried SPI RAM? I have written a similar emulation for the Arduino DUE (no memory shortage there), but I am planning to migrate it to the Teensy 3.1, using external SPI RAM. Theoretically it could be done by the UNO as well.