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Z80 SBC RC2015
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SC114 v1.0 Z80 Motherboard for RC2014

3 years ago 1650
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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


  • 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


SC114 v1.0 Z80 Motherboard

SC114 v1.0 Z80 Motherboard


ID Name Designator Footprint Quantity Mounted
1 994f4acf33ff4e66aaa5dbbeb5e3fa4f C1,C2,C3,C4,C5,C6,C7 CAP-RAD-2.54MM 7 Yes
2 d4fcaa6b54f54b0ab3d56cab0df8702b U1 PDIP-40-0.6 1 Yes 692-Z84C0010PEG
3 1d747bae4f75423f8574e97772c3550e X1 OSC-08 1 Yes 774-MXO45HS-3C-7.3
4 90671ec88c4c43068d39ee79b0253525 U2 PDIP-32-0.6 1 Yes 913-AS6C1008-55PCN
5 d9a3151c9b254fa6a8bd9aba370b95ce U5 PDIP-16 1 Yes 595-SN74HCT138N
6 783d1fd2254c402eb934e4dae697c689 S1,S3,S2,S4 RC2014-HDR-1X40-S-F-R-2.54MM 4 Yes
7 6478ecf012e14fa7a47668de60728679 U3 PDIP-28-0.6 1 Yes 556-AT27C256R-45PU
8 5ba509f895244278a1309c0031b47188 R1 AXIAL-0.3 1 Yes
9 e08526e65b5e407b8e637a308d00f78f LED1 LED-3MM/2.54 1 Yes 604-WP934ADGD
10 34a7e233c2574249bddb82c64475f538 R4,R3,R2 AXIAL-0.3 3 Yes
11 25911a521fab4d60877c91b814735d7b SW1 TACTILE-PTH-SW 1 Yes 479-1413
12 eb38873a548a44e890646dafc5a28fe9 P1 HDR-1X06-S-M-2.54MM 1 Yes undefined
13 dd7e79a97cd942249563fbc6478cb88c U4 PDIP-14 1 Yes 595-CD74HCT4075E


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