Changes

* Access mass storage devices with [[UniDOS]]; use the USB key or SD card directly from BASIC and well-behaving apps (which support extra disk ROMs and a C drive); load games and tools from the mass storage media

The hardware went through multiple iterations before reaching final state. Each version identifies itself on the USB link and the version should be visible in Windows device manager or lsusb on Linux.

The first prototype was an hand-wired one. There were some changes to I/O ports used since then, so it is not usable anymore.

The first 5 boards were manufactured with an early PCB design, which required some wire-patches to get things working. With the wire-patches, this version behaves the same as 1.0.

About 20 boards were shipped with version 1.0. Unfortunately, as people started to write software using it it turned out that the serial port chip has compatibility problems with the z80 timings. As a result, this version of the board can use the serial port only with the FIFO disabled, which makes it impossible to reach high baudrates. The board is still perfectly usable if you are interested only in the microSD and USB host port.

This version of the board replaces the serial chip with a slightly different one. The board still reads "v1.0" as it is the same PCB, only the chip used has changed.

Version 1.0 uses a TI TL16C550D chip. Version 1.1 uses a NXP SC16C650B chip.

Like the previous version, it provides one USB host port and one µSD slot with built-in support for mass storage and FAT filesystem. However, please note '''serial port has been removed'''. It is fully compatible (same port address). Of course, nothing is mapped on serial port addresses.