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Std edition SC114 v1.0 Z80 Motherboard for RC2014

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License: Public Domain

Published Time: 2020-08-10 20:11:03
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Description

This project is designed to be an easy build Z80 system.

The idea is that you can build the board without even fitting those tedious RC2014 sockets, then test it with the simple bit-bang serial port. That's 5 chips + oscillator + 6 pin header + a few Rs and Cs + LED + reset button. Looks like this takes about 175 solder joints. Sounds a lot, but way fewer than typical RC2014. Should be a good chance of such a simple circuit working first time. If it doesn't work then it is a relatively simple circuit to troubleshoot. The onboard LED can flash results of the self-test, so a serial port problem will not look like a dead processor. You can then add the four 40 pin RC2014 module sockets. So that's a further 160 solder joints, but it is incremental assembly thus relatively easy to work out where any new fault is.

Documentation and firmware at www.scc.me.uk

Specs

  • 128k bytes RAM (second 64k not easy to use, so best consider it to be 64k usable)
  • 32k bytes ROM, which can be paged out with the usual write to port 0x38
  • Simple bit-bang serial port to get you started
  • Four RC2014 standard bus sockets
  • Simple reset button (no power on reset or reset debounce)
  • LED for power and status indication
  • Runs the Small Computer Monitor, with ROM BASIC and the CP/M loader included
design drawing
schematic diagram
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PCB
1 /
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ID Name Designator Footprint Quantity Mounted
1 100nF C1,C2,C3,C4,C5,C6,C7 CAP-RAD-2.54MM 7 Yes
2 Z80 CPU U1 PDIP-40-0.6 1 Yes 692-Z84C0010PEG
3 7.3728MHz X1 OSC-08 1 Yes 774-MXO45HS-3C-7.3
4 RAM 128k bytes U2 PDIP-32-0.6 1 Yes 913-AS6C1008-55PCN
5 74HCT259 U5 PDIP-16 1 Yes 595-SN74HCT138N
6 RC40 Card Socket S1,S3,S2,S4 RC2014-HDR-1X40-S-F-R-2.54MM 4 Yes
7 EPROM 32k bytes U3 PDIP-28-0.6 1 Yes 556-AT27C256R-45PU
8 470R R1 AXIAL-0.3 1 Yes
9 GRN-3MM LED1 LED-3MM/2.54 1 Yes 604-WP934ADGD
10 10k R4,R3,R2 AXIAL-0.3 3 Yes
11 RESET SW1 TACTILE-PTH-SW 1 Yes 479-1413
12 HDR_TTL_Serial P1 HDR-1X06-S-M-2.54MM 1 Yes undefined
13 74HCT4075 U4 PDIP-14 1 Yes 595-CD74HCT4075E

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