THIS PRODUCT HAS BEEN RETIRED

ZTO-80 SBC v3.1 has been retired and no more boards will be produced. SBC v3.2, which is identical to v3.1, except that a pin header has been moved, will be available to purchase in early 2023.

ZTO-80 SBC

The ZTO-80 SBC is a fully customizable Z80 SBC with loads of features, including two serial channels, two PIO channels, a CTC, and support for BASIC. It is unique when compared to many other Z80 SBCs due to the fact that it includes no microcontrollers or PLDs for glue logic, using only discrete components. It also contains pins to give the user access to nearly every useful signal on the board.

It is the perfect environment for getting started with the Z80, both in hardware and software. Because the ROM can be programmed by the user, you can write and test your own software for a wide range of peripherals which can be attached to the SBC. You can even design your own peripherals to connect to it. A BASIC interpreter can be programmed to the ROM to allow the use of a high level programming environment.

The ZTO-80 expansion bus header provides a standard interface for accessing many of the pins of the Z80 CPU, such as the address and data buses. By soldering a pin socket to the expansion bus, it can be used to attach a standard ZTO-80 module, allowing nearly infinite possibilities for customization.

The full documentation for the SBC, including assembly instructions and a parts list, can be found in the Github repository or in the "Specs and Docs" section of this page.

Important Note: One pin header jumper is required for operation. It is used to connect the clock to the system. Jumpers are also used to configure certain features, such as if the serial ports will provide power.

Features:

• CPU: Zilog Z80, running at 4-20MHz (depending on the model and your crystal choice)
• Memory:
  • RAM: 32K
  • ROM: 32K (with optional BASIC interpreter)
• I/O:
  • SIO:
    • Two serial channels with programmable baud rate
  • PIO:
    • Two 8-bit parallel ports, one with a Darlington transistor array for high current output
  • CTC:
    • Four timers with external triggers

What you get:

• 1x ZTO-80 SBC bare PCB

Shipping:

Shipping to the US is through USPS First Class Mail. It normally takes 3-5 business days once I've sent it out to arrive. If your rate is different than what is listed, I will contact you to sort it out.

I'm happy to ship outside of the US, but it is difficult to calculate shipping rates. If you would like to request shipping to a destination outside of the US, please send me a message and I can help arrange it.

The ZTO-80 has been an ongoing project maintained by only me for over a year. By buying through my store, you're helping me to continue to produce the ZTO-80 and motivating me to continue to improve it.