This kit contains 3 empty PCBs and all parts (sockets, pins and passive components) to help you build a 32k RAM/ROM - Z80 based system. The kit does not contain ICs This kit may be suitable for those who have similar non-functioning systems (Repair or Upgrade).

You may wonder why this kit only has 3 modules (PCBs) while comparable systems have 5 PCBs. The reason is that I have combined several functions on one module but still maintaining the same functionality. Actually, this kit has some advantages like reducing the number of modules, improves the reliability of the system and save slots on the backplane. Mounting the crystal on both the serial and the CPU modules improves the reliability further of the system, but enables also the CPU to run at a different or higher clock speed then the serial chip (up to 20Mhz if your Z80 CPU can handle it).

The kit consists of the following modules/PCBs (ICs not included)

• 21d Z80 CPU and clock module (up to 20Mhz)
• • 20Mhz crystal included
• • switch easily between clock speeds

• 31e Serial MC68B50P ACIA and clock module (rec. 7.3728Mhz)

• • 7.3728Mhz crystal included<
• • giving communication speed of 115200,8,N,1 baud.

• 41d Memory Module; 32kb RAM + banked 8 x 8kb ROM

• • switching between banks

The 64k repair/upgrade kit contains different PCBs but gives the same or better functionality.

• 22c Z80 CPU and clock module (up to 20Mhz)
• • 20Mhz crystal oscillator included
• • switch easily between clock speeds

• 33g Serial MC68B50P ACIA and clock module (rec. 7.3728Mhz)

• • 7.3728Mhz crystal oscillator included
• • giving communication speed of 115200,8,N,1 baud.

• 45d Memory Module; 128 RAM (only 64k used) + 64k ROM (only 32k used)

the kit contains; 74HCT00, 74HCT02, 74HCT138 (2x), 64k ROM chip, 128k RAM chip you need to provide the Z80 cpu, 68B50 acia and two 74HCT32

You find more information about this and other modules at my homepage www.z80.no. Here you also find troubleshooting guides. You can also send me a message if you have any questions.

If you think the problem is with the backplane, here is one product which may help SC112 Modular Backplane If you have problems with the serial connection, a reliable serial-USB is also available here.

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 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.