2 layers72 × 50.8 mm
2 layers162.2 × 134.6 mm
Sg1000
barbeque/sg100033A homebrew Sega SG-1000, with an eye towards SC-3000 compatibility
- Size
- 162.2 × 134.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 89
- Nets
- 171
- Pads
- 667
- Tracks, vias
- 2,405, 531
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 27 Mar 2020
- Updated
- 18 Oct 2026
Overview
Sg1000 is an open-source printed circuit board by barbeque, from the barbeque/sg1000 repository on GitHub. It is a 2-layer board of 162.2 × 134.6 mm with 89 parts on 171 nets, routed with 2,405 tracks and 531 vias.
It is built around the 27C256-17/J, 74HCT574D and 74LS257PC, with the 74LS32SC, 74HCT04D and 74LS00SC among its other parts. Its parts include 21 resistors, 20 ICs, 12 capacitors, 4 connectors and 3 switches. It belongs with the retro computing and games boards of this library.
Main components
1227C256-17/J
-0℃~+70℃ 256Kbit 4.5V~5.5V EPROM Parallel Port (Parallel) - Non-Volatile Memory (ROM)Microchip TechnologyNon-Volatile Memory (ROM)
74HCT574D
SO-20-300mil-40℃~+125℃ 1 18ns@4.5V,50pF 3.5pF 3ns 4.5V~5.5V 5ns 69MHz 6mA 6mA 74HCT Series 8 8uA D-Type Rising Edge Tri-State SOIC-20-300mil Flip Flops ROHSNexperiaFlip Flops
74LS257PC
DIP-160℃~+70℃ 12mA 2.6mA 24mA 27ns@5V,150pF 4.75V~5.25V 74LS Output enable high-impedance、Tri-state output DIP-16 Signal Switches, Multiplexers, DecodersTexas InstrumentsSignal Switches, Multiplexers, Decoders
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
74HCT04D
SO-14-40℃~+125℃ 1 19ns@4.5V,50pF 2V 2uA 3.7V 4.5V~5.5V 400mV 4mA 4mA 6 74HCT 800mV SO-14 Inverters ROHSNexperiaInverters
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates74LS139PC
PDIP-1622ns 74LS 8mA Decoder Single Supply PDIP-16 Signal Switches, Multiplexers, DecodersonsemiSignal Switches, Multiplexers, Decoders
74LS14PC
PDIP-14InvertersTexas Instruments
74LS573PC
DIP-200℃~+70℃ 10ns 3ns 4.75V~5.25V 74LS 8 D Latch Tri-State DIP-20 Latches ROHSTexas InstrumentsLatches
RCJ-013
-- RCA Connector ROHSCUIAudio Connectors (Headphones)RCJ-014
插件插件 RCA Connector ROHSCUIAudio Connectors (Headphones)USB-B1HSB6
插件插件 USB Connectors ROHSOn-Shore TechUSB Connectors
README
cartridges/basic-iiib/README.mdThis folder contains the kicad source files to construct a clone of the Sega SC-3000 BASIC IIIB cartridge that uses UM61512 SRAM instead of the original DRAM, which makes it also compatible with the SK-1100-equipped SG-1000.
Parts
89| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 10kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R16, R17, R18, R21 |
| 3 | 0.1µF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C9, C16, C100 |
| 3 | 47kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R19, R20, R23 |
| 3 | 74HCT574 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U100, U101, U102 |
| 2 | 0.1µF | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1, C2 |
| 2 | 330Ω | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R13, R15 |
| 2 | 33pF | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C7, C8 |
| 2 | 4.7kΩ | Resistor_THT:R_Array_SIP7 | RN1, RN2 |
| 2 | 560Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R9 |
| 2 | 74LS257 | Package_DIP:DIP-16_W7.62mm_Socket_LongPads | U18, U21 |
| 2 | 74LS32 | Package_DIP:DIP-14_W7.62mm_LongPads | U4, U16 |
| 2 | AS6C62256-DIP | Package_DIP:DIP-28_W15.24mm_Socket_LongPads | U11, U103 |
| 2 | DB9_Female | LeadedSolder:Assman-A-DS_09_A-KG-T2S-Correct | JOY1, JOY2 |
| 2 | FerriteBead_Small | Inductor_SMD:L_1206_3216Metric_Pad1.22x1.90mm_HandSolder | FB1, FB16 |
| 2 | Jumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged2Bar_Pad1.0x1.5mm | JP1, JP2 |
| 1 | +5V | TestPoint:TestPoint_Loop_D2.50mm_Drill1.0mm | TP2 |
| 1 | 0-20pF | LeadedSolder:Tayda_Variable_Trimmer_Cap | CV1 |
| 1 | 0.22µF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4 |
| 1 | 0Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7 |
| 1 | 10.73863MHz | Crystal:Crystal_HC49-U_Vertical | X2 |
| 1 | 100kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R22 |
| 1 | 100Ω | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1 |
| 1 | 10µF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6 |
| 1 | 1MΩ | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R8 |
| 1 | 1kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R4 |
| 1 | 1kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R12 |
| 1 | 220µF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C5 |
| 1 | 22µF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C3 |
| 1 | 27C256 | LeadedSolder:DIP-28_W15.24mm_ZIF_Pads | U5 |
| 1 | 2A | Fuse:Fuse_0805_2012Metric_Pad1.15x1.40mm_HandSolder | F1 |
| 1 | 2n3906 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1c1 |
| 1 | 2n4401 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1 |
| 1 | 470Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R11 |
| 1 | 47kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R3 |
| 1 | 6800pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C17 |
| 1 | 74HCT04 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U99 |
| 1 | 74LS00 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U7 |
| 1 | 74LS139 | Package_DIP:DIP-16_W7.62mm_LongPads | U13 |
| 1 | 74LS14 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U17 |
| 1 | 74LS573 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U6 |
| 1 | 75Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R14 |
| 1 | 975Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10 |
| 1 | Conn_01x07_Female | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | CN1 |
| 1 | D | Diode_THT:D_A-405_P7.62mm_Horizontal | D1 |
| 1 | GND | TestPoint:TestPoint_Loop_D2.50mm_Drill1.0mm | TP3 |
| 1 | Jumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP16 |
| 1 | Jumper_3_Bridged12 | Jumper:SolderJumper-3_P1.3mm_Bridged2Bar12_Pad1.0x1.5mm_NumberLabels | JP17 |
| 1 | LED | LED_THT:LED_D3.0mm | D2 |
| 1 | LOGO | Logos:solder30mm | G*** |
| 1 | LOGO | Logos:leaded30mm | G*** |
| 1 | LOGO | Logos:Soggy | G*** |
| 1 | Pause Key | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | Power Toggle | LeakyChips:PVA1_Switch | SW2 |
| 1 | RCJ-013 | Jacks:CUI_RCJ-017 | J3 |
| 1 | RCJ-014 | Jacks:CUI_RCJ-017 | J2 |
| 1 | Reset Key | Button_Switch_THT:SW_PUSH_6mm | SW3 |
| 1 | SG-1000-Cart | LeadedSolder:SG1000_Cart | U1 |
| 1 | SG-1000-Expansion | LeadedSolder:SG1000_Edge | U2 |
| 1 | SN76489AN | Package_DIP:DIP-16_W7.62mm_LongPads | U3 |
| 1 | TMS9918A | Package_DIP:DIP-40_W15.24mm_Socket_LongPads | U12 |
| 1 | USB-B1HSB6 | USB-B1HSB6:OST_USB-B1HSB6 | J1 |
| 1 | Z80CPU | Package_DIP:DIP-40_W15.24mm_Socket_LongPads | U9 |
| 1 | ~{NMI} | TestPoint:TestPoint_Loop_D2.50mm_Drill1.0mm | TP1 |
The 83 most common of 89 parts.
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Questions
How big is the Sg1000 PCB?
It measures 162.2 × 134.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Sg1000 use?
89 parts, built around the 27C256-17/J, 74HCT574D, 74LS257PC and 74LS32SC. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Sg1000 KiCad files?
From the barbeque/sg1000 repository on GitHub, at the commit this page was made from: the board is sg1000.kicad_pcb and its schematic cartridges/basic-iiib/basic3.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sg1000 design in my own project?
Its repository states no licence, so its author keeps all rights: ask barbeque before reusing the design.