AtariHDisk4

Smonson Disk

SD card (2x) to ACSI hard drive interface.

This project aims to develop a reliable and useful hard drive solution for Atari ST with two SD card sockets and a battery-backed clock, satisfying the ACSI protocol, voltage, and timing requirements as given in available specifications.

Features:

• FPGA-controlled ACSI interface to ensure timing conforms to the specification
• One front-mounted removable SD card socket
• One internally-mounted microSD card socket
• SD cards running on a 10MHz SPI bus (1.25MB/s throughput)
• Battery-backed real-time clock
• GUI configuration from ST (once someone writes it...) and stored in EEPROM
• Open-source, so if you want a feature all you have to do is write it and fit it into the 110KB of code space that is currently left!

How to build and upload:

Building the microcontroller firmware:

Prerequisites

You will need to install:

• A version of GCC that includes support for avr128da microcontrollers, cross-compiled for AVR (e.g. 5.4.0).
• A very recent version of avr-libc that has support for avr128da microcontrollers - https://www.nongnu.org/avr-libc/. You may need to get this from their github repo.
• A copy of the avr128da "atpack" from Microchip - go to https://packs.download.microchip.com/ and search for avr128da; " Microchip AVR-Dx Series Device Support (2.4.286)" will pop open. Download this file, then change the file extension to .zip and unzip it into the directory mcu-source/atpack.
• (if you are using an Arduino as a programmer) A copy of jtag2updi from the githup repo here: https://github.com/ElTangas/jtag2updi. You will already have this on your system from when you programmed the device.

Building

1. Inside mcu-source:
2. Update the Makefile and set up LIBC variable to reflect the path to avr-libc on your system
3. Update the AVRDUDE variable to reflect your programmer setup (probably just the avrdude.conf path)
4. With the UPDI programmer connected, build the source and flash the microcontroller with make flash

Building the FPGA configuration ROM image:

Prerequisites

You will need to install Quartus Lite which is a free download from Intel, although you will need to create an account. Make sure you install MAX V family support You will also need a "USB-Blaster" or compatible programmer. If using Linux, you will very likely need to install a udev "rules" file for the programmer before it'll work.

Building

Just open the project in Quartus, go to "start compilation", then after it's compiled, open the programmer tool and program the chip. It should auto-detect the settings. If it doesn't find the USB Blaster hardware then it's probably udev's fault.