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Description: This site is all about homebrew 8-bit retro computers. Software projects Example code Alphanumeric LCD (4-bit parallel) I2C using SC126 and PCF8574 I2C demo version 2 Simple Z80 SIO test program Small Computer Monitor Small Computer Workshop Small Computer Monitor Apps Hardware projects Standalone Systems: SC131 - Z180 Pocket-sized Computer RCBus-2014, standard bus, 40 pins…

Open Graph Description: This site is all about homebrew 8-bit retro computers. Software projects Example code Alphanumeric LCD (4-bit parallel) I2C using SC126 and PCF8574 I2C demo version 2 Simple Z80 SIO test program Sm…

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Projectshttps://smallcomputercentral.com/projects/
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Kitshttps://smallcomputercentral.com/kits/
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Contacthttps://smallcomputercentral.com/contact/
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Alphanumeric LCD (4-bit parallel)https://smallcomputercentral.wordpress.com/example-alphanumeric-lcd/
I2C using SC126 and PCF8574https://smallcomputercentral.wordpress.com/example-i2c-using-sc126-and-pcf8574/
I2C demo version 2https://smallcomputercentral.com/scm-app-i2c-demo-version-2-2/
Simple Z80 SIO test programhttps://smallcomputercentral.wordpress.com/example-z80-sio-test/
Small Computer Monitorhttps://smallcomputercentral.wordpress.com/small-computer-monitor/
Small Computer Workshophttps://smallcomputercentral.wordpress.com/small-computer-workshop/
Small Computer Monitor Appshttps://smallcomputercentral.wordpress.com/scm-apps/
SC131 – Z180 Pocket-sized Computerhttps://smallcomputercentral.wordpress.com/sc131-z180-pocket-computer/
SC114 – Z80 SBC/Motherboardhttps://smallcomputercentral.wordpress.com/sc114-documentation/
SC130 – Z180 SBC/Motherboardhttps://smallcomputercentral.wordpress.com/sc130-z180-motherboard/
SC691 – Z80 RomWBW, CP/M and SCM Systemhttps://smallcomputercentral.com/rcbus/sc600-series-selection/sc691-rcbus-z80-computer/
SC191 – Z80 CP/M Computer Systemhttps://smallcomputercentral.com/sc191-rcbus-z80-computer/
SC192 – Z80 Basic Computer Systemhttps://smallcomputercentral.com/sc192-rcbus-z80-computer/
SC193 – Z80 CP/M Computer Systemhttps://smallcomputercentral.com/sc193-rcbus-z80-computer/
SC671 – Modular Backpane, 6+1, 5 volt inputhttps://smallcomputercentral.com/sc671-rcbus-backplane/
SC672 – Modular Backplane, extensionhttps://smallcomputercentral.com/sc672-rcbus-backplane/
SC673 – Modular Backpane, 10+1, 5 volt inputhttps://smallcomputercentral.com/sc673-rcbus-backplane/
SC133 – Modular Backplane, 11+1, 8-15 volt inputhttps://smallcomputercentral.wordpress.com/sc133-modular-backplane-rc2014/
SC141 – Modular Backplane, 12+1, extensionhttps://smallcomputercentral.wordpress.com/sc141-modular-backplane-rc2014/
SC147 – Modular Backplane, 6+1, extensionhttps://smallcomputercentral.wordpress.com/sc147-modular-backplane-rc2014/
SC601 – Z80 CPU Modulehttps://smallcomputercentral.com/rcbus/sc600-series-selection/sc601-rcbus-z80-cpu-module/
SC602 – Memory Modulehttps://smallcomputercentral.com/rcbus/sc600-series-selection/sc602-rcbus-z80-memory-module/
SC603 – Serial Module (Z80 SIO/2)https://smallcomputercentral.com/rcbus/sc600-series-selection/sc603-rcbus-z80-sio-2-serial-module/
SC604 – Compact Flash Modulehttps://smallcomputercentral.com/rcbus/sc600-series-selection/sc604-rcbus-compact-flash-module/
SC605 – Digital I/O Modulehttps://smallcomputercentral.com/rcbus/sc600-series-selection/sc605-rcbus-digital-i-o-module/
SC606 – Real Time Clock Modulehttps://smallcomputercentral.com/rcbus/sc600-series-selection/sc606-rcbus-rtc-module/
SC607 – Prototyping Modulehttps://smallcomputercentral.com/rcbus/sc600-series-selection/sc607-rcbus-prototyping-module/
SC608 – I2C Bus Master Modulehttps://smallcomputercentral.com/rcbus/sc600-series-selection/sc608-rcbus-i2c-bus-master/
SC609 – Servo Control Modulehttps://smallcomputercentral.com/rcbus/sc600-series/sc609-rcbus-servo-controller/
SC610 – Serial Module, ACIAhttps://smallcomputercentral.com/rcbus/sc600-series-selection/sc610-rcbus-serial-acia/
SC611 – Micro SD Modulehttps://smallcomputercentral.com/rcbus/sc600-series-selection/sc611-rcbus-micro-sd/
SC612 – Serial Module, ACIAhttps://smallcomputercentral.com/rcbus/sc600-series/sc612-rcbus-serial-acia/
SC613 – Compact Flash Modulehttps://smallcomputercentral.com/rcbus/sc600-series/sc613-rcbus-compact-flash-module/
SC614 – Power Supply Module, 8-15 volt inputhttps://smallcomputercentral.com/sc614-rcbus-power-supply-module/
SC134 – LED Output Modulehttps://smallcomputercentral.wordpress.com/sc134-led-output-module-rc2014/
SC135 – Digital Output Modulehttps://smallcomputercentral.wordpress.com/sc135-digital-output-module-rc2014/
SC136 – Digital Input Modulehttps://smallcomputercentral.wordpress.com/sc136-digital-input-module-rc2014/
SC137 – I2C Bus Master Modulehttps://smallcomputercentral.wordpress.com/sc137-i2c-master-module-rc2014/
SC139 – Serial 68B50 ACIA Modulehttps://smallcomputercentral.wordpress.com/sc139-serial-68b50-module-rc2014/
SC142 – Power Supply Modulehttps://smallcomputercentral.wordpress.com/sc142-power-module-rc2014/
SC143 – ROM Modulehttps://smallcomputercentral.wordpress.com/sc143-rom-module-rc2014/
SC145 – Compact Flash Modulehttps://smallcomputercentral.com/sc145-compact-flash-rc2014/
SC148 – Power Supply Modulehttps://smallcomputercentral.wordpress.com/sc148-power-module-rc2014/
SC149 – Z80 CPU Modulehttps://smallcomputercentral.com/sc149-z80-cpu-module-rc2014/
SC150 – Paged RAM Modulehttps://smallcomputercentral.com/sc150-paged-ram-module-rc2014/
SC151 – Paged ROM modulehttps://smallcomputercentral.com/sc151-paged-rom-module-rc2014/
SC600 Serieshttps://smallcomputercentral.com/rcbus/sc600-series/
SC201 – Minimal Z80 Systemhttps://smallcomputercentral.wordpress.com/sc201-boards-for-a-minimal-z80-computer/
SC202 – Flexible Z80 Systemhttps://smallcomputercentral.wordpress.com/sc202-boards-for-a-flexible-z80-computer/
SC102 – Z80 CTC Modulehttps://smallcomputercentral.wordpress.com/sc102-z80-ctc-module-rc2014/
SC103 – Z80 PIO Modulehttps://smallcomputercentral.wordpress.com/sc103-z80-pio-module-rc2014/
SC104 – Z80 SIO/2 Modulehttps://smallcomputercentral.wordpress.com/sc104-z80-sio-2-module-rc2014/
SC108 – Z80 Processor Modulehttps://smallcomputercentral.wordpress.com/sc108-z80-processor-rc2014/
SC110 – Z80 Serial with Timer Modulehttps://smallcomputercentral.wordpress.com/sc110-z80-serial-rc2014-3/
SC115 – Prototyping Breakout Modulehttps://smallcomputercentral.com/sc115-breakout-rc2014/
SC129 – Digital I/O Modulehttps://smallcomputercentral.wordpress.com/sc129-digital-i-o-rc2014/
SC132 – Z80 SIO/0 Modulehttps://smallcomputercentral.wordpress.com/sc132-z80-sio-0-module-rc2014/
SC152 – Memory Modulehttps://smallcomputercentral.com/sc152-memory-module-rc2014/
SC153 – Z80 CPU Modulehttps://smallcomputercentral.com/sc153-z80-cpu-module-rc2014/
RC2014 Systemhttps://smallcomputercentral.wordpress.com/rc2014/
SC146 – Pin Puller Toolhttps://smallcomputercentral.com/sc146-pin-puller-tool-rc2014/
SC126 – Z180 SBC/Motherboard with RomWBW and SCMhttps://smallcomputercentral.wordpress.com/sc126-z180-motherboard-rc2014/
SC720 – Z80 SBC/Motherboard with RomWBW and SCMhttps://smallcomputercentral.com/sc781-rcbus-z80-sbc-motherboard/
SC791 – Z80 RomWBW Modular Computerhttps://smallcomputercentral.com/sc791-rcbus-z80-romwbw-computer/
SC792 – Z180 RomWBW Modular Computerhttps://smallcomputercentral.com/sc792-modular-z180-computer/
SC794 – Z80 RomWBW SCM computer for RCBushttps://smallcomputercentral.com/sc794-rcbus-z80-computer/
SC701 – Modular Backplane 6+1, 5 volt inputhttps://smallcomputercentral.com/sc701-rcbus-backplane/
SC702 – Modular Backplane 6+1, extensionhttps://smallcomputercentral.com/sc702-rcbus-backplane/
SC709 – Modular Backplane 12+1, 5 volt inputhttps://smallcomputercentral.com/sc709-rcbus-backplane/
SC710 – Modular Backplane 12+1, extensionhttps://smallcomputercentral.com/sc710-rcbus-backplane/
SC723 – Backplane 3-slot, 5 volt inputhttps://smallcomputercentral.com/sc723-rcbus-backplane-3/
SC703 – Power Supply Module, 8-15 volt inputhttps://smallcomputercentral.com/sc703-rcbus-i2c-bus-master/
SC704 – I2C Bus Master Modulehttps://smallcomputercentral.com/sc704-rcbus-i2c-bus-master/
SC705 – Serial ACIA Modulehttps://smallcomputercentral.com/sc705-rcbus-serial-acia/
SC706 – Z80 CPU Modulehttps://smallcomputercentral.com/sc706-rcbus-z80-cpu-module/
SC707 – Z80 Memory Module, 128khttps://smallcomputercentral.com/sc707-rcbus-memory-module/
SC708 – Z80 SBC Modulehttps://smallcomputercentral.com/sc708-rcbus-z80-sbc-module/
SC711 – Prototyping Modulehttps://smallcomputercentral.com/sc711-rcbus-prototyping-module/
SC712 – Power Supply Module, 5 volt inputhttps://smallcomputercentral.com/sc712-rcbus-power-supply-module/
SC714 – Z80 Memory Module, 512khttps://smallcomputercentral.com/sc714-rcbus-z80-memory-module/
SC715 – Compact Flash Modulehttps://smallcomputercentral.com/sc715-rcbus-compact-flash-module/
SC716 – Z80 SIO/2 Modulehttps://smallcomputercentral.com/sc716-rcbus-z80-sio-2-serial-module/
SC717 – Z80 PIO Modulehttps://smallcomputercentral.com/sc717-rcbus-z80-pio-module/
SC718 – Z80 CTC Modulehttps://smallcomputercentral.com/sc718-rcbus-z80-ctc-module/
SC719 – Digital I/O Modulehttps://smallcomputercentral.com/sc719-rcbus-digital-i-o-module/
SC721 – 1MB Linear Memory Modulehttps://smallcomputercentral.com/sc721-rcbus-memory-module/
SC722 – Z180 CPU Modulehttps://smallcomputercentral.com/sc722-rcbus-z180-cpu-module/
SC724 – Breakout Prototyping Modulehttps://smallcomputercentral.com/sc724-rcbus-breakout-module/
SC725 – Z80 SIO and Z80 CTC Modulehttps://smallcomputercentral.com/sc725-rcbus-serial-and-timer-module/
SC726 – Clock Oscillator Modulehttps://smallcomputercentral.com/sc726-rcbus-clock-module/
SC727 – Real Time Clock Modulehttps://smallcomputercentral.com/sc727-rcbus-rtc-module/
SC729 – Compact Flash Modulehttps://smallcomputercentral.com/sc729-rcbus-compact-flash-module/
SC730 – Z80 CPU plus MMUhttps://smallcomputercentral.com/sc730-rcbus-z80-cpu-plus-mmu-module/
SC731 – Dual Channel PWM Modulehttps://smallcomputercentral.com/sc731-rcbus-dual-pwm-module/
SC732 – Dual Channel Servo Modulehttps://smallcomputercentral.com/sc732-rcbus-dual-servo-module/
SC733 – Prototyping Modulehttps://smallcomputercentral.com/sc733-rcbus-prototyping-module/
SC734 – Micro SD Modulehttps://smallcomputercentral.com/rcbus/sc700-series/sc734-rcbus-micro-sd/
SC735 – Prototyping Modulehttps://smallcomputercentral.com/sc735-rcbus-prototyping-module/
SC736 – Prototyping Modulehttps://smallcomputercentral.com/rcbus/sc700-series/sc736-rcbus-prototyping-module/
SC737 – Interrupt Generator Modulehttps://smallcomputercentral.com/rcbus/sc700-series/sc737-rcbus-interrupt-module/
SC738 – Reset Modulehttps://smallcomputercentral.com/rcbus/sc700-series/sc738-rcbus-reset-module/
SC700 Serieshttps://smallcomputercentral.com/rcbus/sc700-series/
SC713 – RCBus Toolhttps://smallcomputercentral.com/sc713-rcbus-tool/
SC728 – Module Riserhttps://smallcomputercentral.com/sc727-rcbus-module-riser/
SC101 – Z80 SBC/Motherboardhttps://smallcomputercentral.wordpress.com/sc101-z0-motherboard-rc2014/
SC105 – Modular Backplanehttps://smallcomputercentral.wordpress.com/sc105-modular-backplane-rc2014/
SC106 – Modular Backplanehttps://smallcomputercentral.wordpress.com/sc106-modular-backplane-rc2014/
SC107 – Modular Backplanehttps://smallcomputercentral.wordpress.com/sc107-modular-backplane-rc2014/
SC109 – Modular Backplane Z50Bus & RC2014+https://smallcomputercentral.wordpress.com/sc109-module-backplane-z50bus-rc2014/
SC111 – Z180 CPU Modulehttps://smallcomputercentral.wordpress.com/sc111-z180-cpu-module-rc2014/
SC112 – Modular Backplanehttps://smallcomputercentral.wordpress.com/sc112-modular-backplane-rc2014/
SC113 – Modular Backplanehttps://smallcomputercentral.wordpress.com/sc113-modular-backplane-rc2014/
SC116 – 3-slot Backplanehttps://smallcomputercentral.wordpress.com/sc116-3-slot-backplane-rc2014/
SC119 – Z180 Memory Modulehttps://smallcomputercentral.wordpress.com/sc119-z180-memory-module-rc2014/
SC203 – Modular Z180 Systemhttps://smallcomputercentral.wordpress.com/sc203-modular-z180-computer/
SC591 – Z180 RomWBW CP/M computerhttps://smallcomputercentral.com/sc591-rcbus-z180-computer/
SC592 – Z80 SCM, CP/M computerhttps://smallcomputercentral.com/sc592-rcbus-z80-computer/
SC507 – Backplane, 3-slot, narrow spacinghttps://smallcomputercentral.wordpress.com/sc507-3-slot-backplane-z50bus/
SC501 – Backplane, 7-slot, narrow spacinghttps://smallcomputercentral.wordpress.com/sc501-7-slot-backplane-z50bus/
SC508 – Backplane, 10-slot, wide spacinghttps://smallcomputercentral.wordpress.com/sc508-10-slot-backplane-z50bus/
SC515 – Backplane, 14-slot, narrow spacinghttps://smallcomputercentral.wordpress.com/sc515-14-slot-backplane-z50bus/
SC513 – Modular backplane, 6-slot, 5-volt input, resethttps://smallcomputercentral.wordpress.com/sc513-modular-backplane-z50bus/
SC517 – Modular backplane, RC2014 to Z50Bushttps://smallcomputercentral.wordpress.com/sc517-modular-backplane-rc2014-to-z50bus/
SC522 – Modular backplane, 6-slot, narrow spacinghttps://smallcomputercentral.wordpress.com/sc522-modular-backplane-z50bus/
SC502 – Power supply and reset card, 8 to 15-volt inputhttps://smallcomputercentral.wordpress.com/sc502-power-and-reset-z50bus/
SC503 – Z180 processor card with serial and SPI (SD card)https://smallcomputercentral.wordpress.com/sc503-z180-processor-z50bus/
SC504 – Compact flash storage cardhttps://smallcomputercentral.wordpress.com/sc504-compact-flash-z50bus/
SC505 – Real-time clock and I2C bus masterhttps://smallcomputercentral.wordpress.com/sc505-rtc-i2c-card-z50bus/
SC506 – Digital I/O cardhttps://smallcomputercentral.wordpress.com/sc506-digital-i-o-z50bus/
SC509 – Z80 PIO (Parallel I/O) cardhttps://smallcomputercentral.wordpress.com/sc509-z80-pio-z50bus/
SC510 – Prototyping cardhttps://smallcomputercentral.wordpress.com/sc510-prototyping-card-z50bus/
SC511 – Serial (SIO) and timer (CTC) cardhttps://smallcomputercentral.wordpress.com/sc511-serial-card-z50bus/
SC512 – Prototyping breakout cardhttps://smallcomputercentral.wordpress.com/sc512-breakout-card-z50bus/
SC514 – Z80 CTC (Counter/Timer) cardhttps://smallcomputercentral.wordpress.com/sc514-z80-ctc-card-z50bus/
SC516 – Z80 Processor card (CPU, RAM, ROM)https://smallcomputercentral.wordpress.com/sc516-z80-processor-card-z50bus/
SC518 – Z80 CPU cardhttps://smallcomputercentral.wordpress.com/sc518-z80-cpu-card-z50bus/
SC519 – Z80 memory cardhttps://smallcomputercentral.wordpress.com/sc519-z80-memory-card-z50bus/
SC520 – Serial ACIA (68B50) cardhttps://smallcomputercentral.wordpress.com/sc520-serial-acia-card-z50bus/
SC521 – Z80 SIO/2 (Serial I/O) cardhttps://smallcomputercentral.wordpress.com/sc521-serial-card-z50bus/
SC523 – Programmable ‘ROM’ cardhttps://smallcomputercentral.wordpress.com/sc523-z80-programmable-rom-card-z50bus/
SC526 – Power supply and reset card, 5-volt inputhttps://smallcomputercentral.wordpress.com/sc526-power-and-reset-z50bus/
SC527 – Z80 Processor cardhttps://smallcomputercentral.com/sc527-z80-processor-card-z50bus/
SC500 serieshttps://smallcomputercentral.wordpress.com/modular-z50bus-system-sc500-series/
LiNC Z50Bus Systemhttps://smallcomputercentral.wordpress.com/linc80-system/
SC117 – Breakout Cardhttps://smallcomputercentral.wordpress.com/sc117-breakout-z50bus/
SC118 – Z80 Processor Cardhttps://smallcomputercentral.wordpress.com/sc118-z80-processor-module-z50bus/
SC125 – Serial and Timer Cardhttps://smallcomputercentral.wordpress.com/sc125-serial-card-z50bus/
SC127 – Compact Flash Interface Cardhttps://smallcomputercentral.wordpress.com/sc127-compact-flash-z50bus/
SC128 – Modular Backplanehttps://smallcomputercentral.wordpress.com/sc128-modular-backplane-z50bus/
SC140 – Z180 Processor Cardhttps://smallcomputercentral.wordpress.com/sc140-z180-sbc-z50bus-card/
SC144 – RTC and I2C Bus Master Cardhttps://smallcomputercentral.wordpress.com/sc144-rtc-i2c-card-z50bus/
SC138 – I2C Memory Cardhttps://smallcomputercentral.wordpress.com/sc138-i2c-memory-card/
SC400 – I2C Bus Moduleshttps://smallcomputercentral.wordpress.com/i2c-bus-modules/
SC401 – I2C Prototyping Modulehttps://smallcomputercentral.wordpress.com/i2c-bus-modules/sc401-i2c-prototyping-module/
SC402 – I2C Memory Module (24xxxx)https://smallcomputercentral.wordpress.com/i2c-bus-modules/sc402-i2c-memory-module/
SC403 – I2C 16-bit Digital I/O Module (MCP23018)https://smallcomputercentral.wordpress.com/i2c-bus-modules/sc403-i2c-digital-i-o-module/
SC404 – I2C 8-bit Digital I/O Module (MCP23008)https://smallcomputercentral.wordpress.com/i2c-bus-modules/sc404-i2c-digital-i-o-module/
SC405 – I2C 8-bit Digital I/O Module (PCF8574)https://smallcomputercentral.wordpress.com/i2c-bus-modules/sc405-i2c-digital-i-o-module/
SC406 – I2C Temperature Sensor Module (TC74)https://smallcomputercentral.wordpress.com/i2c-bus-modules/sc406-i2c-temperature-sensor-module/
SC407 – I2C Switches and Lights Module (PCF8574)https://smallcomputercentral.wordpress.com/i2c-bus-modules/sc407-i2c-switches-and-lights-module/
Tom’s SBC version Chttps://smallcomputercentral.wordpress.com/projects/toms-sbc-version-c/
My Z80 Small Computer (Z80sc)https://smallcomputercentral.wordpress.com/my-z80-small-computer/
New Productshttps://smallcomputercentral.com/2026/03/15/new-products-2/
Prototypinghttps://smallcomputercentral.com/2026/01/31/prototyping/
Micro SDhttps://smallcomputercentral.com/2025/11/12/micro-sd/
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