Here is the new release of zeST, mostly with fixes to make life better. Scan doubler rework The scan doubler has received particular attention for this new release. Indeed, a large part of its logic has been rewritten. This module is one of the first implemented in zeST, even before I got the TOS system to boot. It was already there when I displayed my first image out of the Atari ST logic on a HDMI screen.

This latest release fixes an important bug that made the system hang in specific memory access conditions. Specifically, on the Z7-Lite board, just changing the floppy disk image and then resetting the system triggered the bug. I didn’t see it because most of the development and debugging was done using my Z-Turn board. This bug was introduced in last September’s release, with the new memory interface that featured an internal cache.

This page explains how to get zeST up and running for your FPGA board. Download The latest build of zeST can be downloaded by clicking this link. You can also access older releases by browsing the download directory. The binary archive contains builds for the Microphase Z7-Lite board, 7010 and 7020 versions, as well as the TE0726 “ZynqBerry”. zeST also supports the MyIR Z-Turn 7020 board, but since I’m the only known user of it and its availability is decreasing, it is not included in the official binary distribution.