SmallZ80 Update Log
- 14 November 2018
- We've finalized the design and system configuration. The main
CPU Oscillator has been set to 20MHz with the UART and Slow speed CPU
Oscillator at 14.7456MHz. The mainboard serial ports are fully
operational and reliable up to 460,800 baud, which makes for a lightening
fast terminal. The Expansion board serial ports can operate up to
921,600 baud, primarily intended for communicating with the LAN processor
for LAN-based terminal and printer I/O.
- Pricing data will be updated within a few days, leading to taking
advanced orders and PCB production within the week.
- 30 October 2018
- The Rev E0 CPU board is tested and updated to the final Rev E1
configuration. Production boards will be ordered within two weeks.
The current oscillator configuration is a 25MHz high speed system
oscillator and a 14.7456MHz UART oscillator, which will also supply the
CPU low speed clock. This configuration will allow baud rates up to
921,800 baud for blazing fast display updates. A new User Manual and
CF image have been posted in the download area.
- 10 October 2018
- The Software/Firmware is undergoing rapid development. The
latest CF and Floppy images, EEPROM Code, and User Manual were recently
- 21 September 2018
- Development continues on the SmallZ80 system. The final hardware
configuration is fairly well developed, with a few minor issues remaining.
A new PCB will be forthcoming soon, which will then be made available to
- 23 August 2018
- The SmallZ80 has completed the initial design and testing phases, and
is shifting into more widespread testing. A few prototype kits are
available for the adventurous. The Floppy + 2S expansion board is
now entering the test and software development process. The SmallZ80
CPU board measures about 6.5" wide x 5" front-to-back. Adding the
dual CF adapter widens the footprint to about 9". The entire system
is powered by a 5v, 2.5A wall wart transformer.
- The LAN option replaces the Terminal and Printer serial I/O ports with
a TCP232-E embedded serial-to-Ethernet module. With the LAN option,
Terminal I/O runs at 230,400 baud with CTS/RTS handshaking for nearly
instantaneous terminal display updates. LAN-based Printer I/O runs
at 115,200 baud without handshaking.
- Here's a scan of the SmallZ80 Rev D0 PCB: