Z180 System at 33.333 MHz or 36.864 MHz and TTL or RS232 serial portsDesigned by Circle M Systems in Canada
This will probably be the last batch of MinZ kits due to the rising prices of components and my desire to keep it low cost. I MAY make some MinZ boards available in the future with just the SMT devi…Read More…
This will probably be the last batch of MinZ kits due to the rising prices of components and my desire to keep it low cost. I MAY make some MinZ boards available in the future with just the SMT devices included and soldered.
I'll also be making a batch of ten IO2 boards but they've definitely become too expensive for me to make without a significant redesign. The primary reason is that it's CPLD has increased in price over the past year from about $6 to over $20 (i.e. 330% / +$14) for used ones and new ones are over $42 each. Compounding this is my experience that the quality and reliability of used components has significantly deteriorated after the recent semiconductor shortages.
These systems were designed to be both small and fast Z80 compatible systems running CP/M 2.2 or one of it's derivatives. While they can be used as standalone systems, they do have an I/O expansion bus that allows the user to develop their own peripherals or use with the IO2 demonstration board. Unlike many other Z180 systems, RTS/CTS handshaking has been implemented for the second serial port. After initialization, these systems run with ZERO memory wait states since each wait state would result in approximately a 25% reduction in effective speed.
Size: 2.18" x 2.85" (55.4mm x 72.3mm)
Optional I/O Board:
An optional I/O board is also available. Since most components are SMD, these boards are only being offered in pre-assembled and tested form. This board has the following devices and features:
N.B. The hex LEDs are optional and only orderable in conjunction with the I/O board. They may be "used" as are possibly other devices due to the current supply chain issues. However all previously used devices are tested before shipment and processors are verified to work reliably at 36.864 MHz and 230400 baud.
If the I/O board which includes an SD card is not purchased, the base flash memory will have a .ZIP file with the BIOS source. There is also an option to purchase a USB "thumb" drive with the same data that is on an SD card.
Shipping and handling:
The seller is the original designer / builder of these systems and the author of the BIOS.
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Evgeny | June 27, 2023
Terry | May 10, 2022
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