Z80 CPU for OpenFPGAs, with Icestudio

• Based on the iceZ0mb1e project by abnoname and the TV80 CPU

• Open the z80-soc-16KB-Boot.ice file with Icestudio
• Connect the Alhambra-II board (or compatible) and upload the design
• After 2min aprox. the LEDs will show the value 0xAA
• Let's upload a program test: open a terminal
• Move to the roms folder
• Execute the following line:

python3 z80-loader.py 05-counter.bin

• After 2 seconds you will see a binary counter running on the LEDs

• If you want to assemble that example, execute the following comands:

z80asm -o 05-counter.bin 05-counter.s

The z80-soc-16KB-Boot-uart.ice file adds the following:

• TX/RX Uart mapped in ports 0x10 (Data) and 0x11 (Status). The Data port is for transmitting (out) and receiving (in)
• Input port 0x00. The SW2 button can be read from the bit 0 of port 0x00

Have a look at this examples for more details:

• 08-button-seq.s
• UART-*.s