https://github.com/obijuan/z80-fpga

Z80 CPU for OpenFPGAs, with Icestudio
https://github.com/obijuan/z80-fpga

fpga fpga-soc ice40 icestudio z80

Last synced: 8 days ago
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Z80 CPU for OpenFPGAs, with Icestudio

• Host: GitHub
• URL: https://github.com/obijuan/z80-fpga
• Owner: Obijuan
• License: gpl-3.0
• Created: 2019-08-19T19:40:26.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2024-06-06T17:10:57.000Z (5 months ago)
• Last Synced: 2024-06-07T13:24:13.077Z (5 months ago)
• Topics: fpga, fpga-soc, ice40, icestudio, z80
• Language: Assembly
• Size: 4.45 MB
• Stars: 70
• Watchers: 7
• Forks: 17
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
![](https://github.com/Obijuan/Z80-FPGA/raw/master/wiki/project-logo.png)

# Z80-FPGA

Z80 CPU for OpenFPGAs, with Icestudio

* Based on the [iceZ0mb1e project](https://github.com/abnoname/iceZ0mb1e) by abnoname and the [TV80 CPU](https://opencores.org/project,tv80,overview)

## Quick start

* Open the **z80-soc-16KB-Boot.ice** file with Icestudio

* Connect the Alhambra-II board (or compatible) and upload the design

* After 1 min 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

```

## UART and pushbutton

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