NEW AND REVISED VERSION

What's new; The functionality is the same; Serial, Clock and Storage. The design is new, hopefully making it easier to assemble and use. Also; the LEDs should now blink when active.

A 64MB CF card is now included with the kit

All CF cards are checked before shipment, in the process, the cards are written with an image. A small label indicates the image prepared for a specific setup. A = ACIA (MC68B50P), S = Z80 SIO/2, R = ROMWBW

DESCRIPTION

It is a module which is interoperable within the RC2014 eco-system and it serves 3 functions;

• 1) Serial interface (MC68B50P ACIA) with an FTDI connector.
• 2) A Clock for the serial interface, and it may be routed as a bus clock.
• 3) Compact Flash Card adaptor, for storage.

This module was designed in response to a very popular module made by Steve Cousins, the SC108 which contain a Z80 CPU, 64k RAM, and 32k ROM. This module (#61) and SC108 will together form a complete Z80 based CP/M system, hence "the missing module".

This module has many benefits over similar modules. It is compact, saving slots, but also running asynchronously to the CPU, allowing the CPU to run at any speed up to 24Mhz for Z80 and 33Mhz for Z180. The serial card runs at its own clock speed, recommended at 7.3728Mhz giving a baud rate of 115200/8/N/1. In addition, it provides robust communication and storage.

RECOMMENDED SETUP

For a complete CP/M computer the following components can be used;

• 61c The missing Module (Serial, Clock and Storage)
• SC108 Z80 CPU and Memory Module
• SC116 3-slot backplane
• optional is VGA Serial Terminal Kit with USB

You find more information about this and other modules at my homepage www.z80.no.

NOTES

• RC2014 is a trademark of RFC2795 Ltd (www.rc2014.co.uk).
• The MC6850 is rated at 1Mhz, and the MC68B50 is rated at 2Mhz but runs happily at up to 7.3Mhz.
• This module will also work well with SC114 Motherboard
• This is a hobby electronic kit and only intended for educational and hobby use.
• The kit is provided as parts and is not assembled, some parts may be new old stock or recycled parts since they may be out of production.