2 layers137 × 140 mm
2 layers137 × 140 mm
X1 ROMBASIC
popolonx/SharpX15Sharp X1 computer stuff
- Size
- 137 × 140 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 62
- Pads
- 210
- Tracks, vias
- 668, 14
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 6 Apr 2024
- Updated
- 3 Aug 2025
Overview
X1 ROMBASIC is an open-source printed circuit board by popolonx, from the popolonx/SharpX1 repository on GitHub. It is a 2-layer board of 137 × 140 mm with 19 parts on 62 nets, routed with 668 tracks and 14 vias.
It is built around the 74LS273PC, 74LS10PC and 74LS139PC, with the 74LS27P-E among its other parts. Its parts include 9 capacitors, 8 ICs and 1 resistor.
Main components
4
74LS273PC
PDIP-201 15ns 27mA 27ns@5V,15pF 30MHz 5ns 74LS Series 8 D-Type Reset Rising Edge PDIP-20 Flip Flops ROHSonsemiFlip Flops
74LS10PC
PDIP-140℃~+70℃ 3 3.3mA 4.75V~5.25V 74LS Series NAND Gate PDIP-14 Logic GatesonsemiLogic Gates
74LS139PC
PDIP-1622ns 74LS 8mA Decoder Single Supply PDIP-16 Signal Switches, Multiplexers, DecodersonsemiSignal Switches, Multiplexers, Decoders74LS27P-E
DIP-14-20℃~+75℃ 15ns@5V,15pF 2.7V 2V 3 3 400mV、500mV 74LS 800mV NOR Gate DIP-14 Logic Gates ROHSRenesas ElectronicsLogic Gates
README
CZ_8RS/readme.mdKicad files (kicad version 5.1.5) for CZ-8RS RS-232 board. Based on the http://www.x1center.org/resource/schematic/CZ8RS_Schematic.pdf
- error corrected (IC6-pin4: RESET -> IOEX )
- error corrected (IC17-pin4: from IC15-pin6 -> IC15-pin5 )
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8 |
| 2 | 74LS273 | Package_DIP:DIP-20_W7.62mm | IC6, IC7 |
| 1 | 100u/10V | Capacitor_THT:CP_Radial_D8.0mm_P5.00mm | C10 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 27C512 | Package_DIP:DIP-28_W15.24mm | IC8 |
| 1 | 74ALS32 | Package_DIP:DIP-14_W7.62mm | IC3 |
| 1 | 74LS10 | Package_DIP:DIP-14_W7.62mm | IC2 |
| 1 | 74LS139 | Package_DIP:DIP-16_W7.62mm | IC4 |
| 1 | 74LS27 | Package_DIP:DIP-14_W7.62mm | IC1 |
| 1 | 74LS541 | Package_DIP:DIP-20_W7.62mm | IC5 |
| 1 | BUS_X1 | msx cartridge:X1_IO | BUS_0 |
Questions
How big is the X1 ROMBASIC PCB?
It measures 137 × 140 mm and has 2 copper layers, 1.6 mm thick.
What parts does the X1 ROMBASIC use?
19 parts, built around the 74LS273PC, 74LS10PC, 74LS139PC and 74LS27P-E. 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 X1 ROMBASIC KiCad files?
From the popolonx/SharpX1 repository on GitHub, at the commit this page was made from: the board is CZ_8RB_ONEROM/X1_ROMBASIC.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the X1 ROMBASIC design in my own project?
Its repository states no licence, so its author keeps all rights: ask popolonx before reusing the design.
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