MSX ONE
About the MSX ONE PCB
MSX ONE is an open source PCB design by jdgabbard, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 200 × 150 mm, with 107 components from 58 distinct parts.
Other key parts include the 74HCT74, Z80CPU, MAX701, 74HCT32 and 74LS07. By type, the board carries 38 capacitors, 24 ICs, 22 resistors, 9 connectors, 8 diodes and 3 inductors.
It belongs with the retro computing designs in this gallery.
From the project
MSX 1 Computer from discrete parts
Currently, v1.0 of the Mainboard is untested. Three insignificant changes were made to the mainboard from version P1.1: the addition of a loading resistor on the -12v circuit, addition of a power connector for external floppy support, and a slight change to page select logic (should have no impact in function). However, with that in mind, it is at this time untested. Use of Prototype P1.1 version of the main board is preferable, as it is tested and functional at this time. This will be changed as soon as I have a chance to order new boards and properly test them, in a few weeks.
Main components on the MSX ONE
MSX ONE bill of materials (BOM)
107 components, 58 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 74HCT74 | DIP-14_W7.62mm_Socket | U1, U12 |
| 1 | Z80CPU | DIP-40_W15.24mm_Socket | U2 |
| 1 | MAX701 | DIP-8_W7.62mm_Socket | U3 |
| 2 | 74HCT32 | DIP-14_W7.62mm_Socket | U4, U24 |
| 1 | 74LS07 | DIP-14_W7.62mm_Socket | U5 |
| 1 | TMS9118 | DIP-40_W15.24mm_Socket | U6 |
| 2 | TMS4416 | DIP-18_W7.62mm_Socket | U7, U8 |
| 1 | MC34063AP | DIP-8_W7.62mm | U9 |
| 1 | LM2596S-5 | TO-263-5_TabPin3 | U11 |
| 1 | 28C256 | DIP-28_W15.24mm_Socket | U14 |
| 1 | 628128 | DIP-32_W15.24mm_Socket | U15 |
| 1 | 74HCT02 | DIP-14_W7.62mm_Socket | U16 |
| 2 | 74HCT157 | DIP-16_W7.62mm_Socket | U17, U19 |
| 1 | YM2149 | DIP-40_W15.24mm_Socket | U18 |
| 1 | 74HCT00 | DIP-14_W7.62mm_Socket | U21 |
| 1 | 74HCT139 | DIP-16_W7.62mm_Socket | U22 |
| 1 | 74HCT153 | DIP-16_W7.62mm_Socket | U23 |
| 1 | 82C55A | DIP-40_W15.24mm_Socket | U26 |
| 1 | 74HCT08 | DIP-14_W7.62mm_Socket | U27 |
| 1 | 74HCT138 | DIP-16_W7.62mm_Socket | U28 |
Show 38 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10.738635 MHz | Crystal_HC49-U_Vertical | Y1 |
| 1 | +12V | BarrelJack_Horizontal | J1 |
| 1 | Video | Conn_RCA_Right | J2 |
| 1 | Audio | Conn_RCA_Right | J3 |
| 1 | SEGA Gamepad1 | Conn_Dsub_DE9M | J4 |
| 1 | SEGA Gamepad2 | Conn_Dsub_DE9M | J5 |
| 1 | SLOT1 | Conn_Edge_50P | J6 |
| 1 | SLOT2 | Conn_Edge_50P | J7 |
| 1 | FLP_CON | JST_EH_S4B-EH_1x04_P2.50mm_Horizontal | J8 |
| 1 | KEYBOARD | PinHeader_2x08_P2.54mm_Vertical | J9 |
| 1 | RESET SW | SW_Tactile_SPST_Angled_PTS645Vx83-2LFS | SW1 |
| 1 | PWR_SW | JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | SW2 |
| 1 | LED | LED_D3.0mm | D1 |
| 1 | 2W10 | Diode_Bridge_Round_D9.0mm | D2 |
| 1 | 1N5819 | D_DO-41_SOD81_P10.16mm_Horizontal | D3 |
| 4 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D4, D5, D6, D7 |
| 1 | 1N5822 | D_DO-201AD_P15.24mm_Horizontal | D9 |
| 1 | 1uH | L_Axial_L7.0mm_D3.3mm_P10.16mm_Horizontal_Fastron_MICC | L1 |
| 2 | 68uH | L_Radial_D8.7mm_P5.00mm_Fastron_07HCP | L2, L5 |
| 25 | 100nF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C3, C4, C7, C8, C9, C10 +17 |
| 2 | 27pF | C_Disc_D4.7mm_W2.5mm_P5.00mm | C5, C6 |
| 1 | 470pF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C12 |
| 1 | 220uF | CP_Radial_D10.0mm_P5.00mm | C14 |
| 2 | 470uF | CP_Radial_D10.0mm_P5.00mm | C16, C17 |
| 4 | 10uF | CP_Radial_D5.0mm_P2.50mm | C20, C21, C22, C23 |
| 3 | 10uF | CP_Radial_D5.0mm_P2.00mm | C37, C38, C39 |
| 2 | 1K | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1, R5 |
| 8 | 10K | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R2, R15, R16, R17, R18, R20, R28, R29 |
| 1 | 1k | R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R3 |
| 1 | 0.24R | R_Axial_DIN0414_L11.9mm_D4.5mm_P15.24mm_Horizontal | R6 |
| 1 | 8K2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7 |
| 1 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 2 | 470R | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R9, R14 |
| 2 | 4K7 | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R10, R11 |
| 1 | 20K | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R12 |
| 1 | 2K2 | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R13 |
| 1 | 4.7K | R_Array_SIP9 | RN1 |
| 1 | 10K | R_Array_SIP9 | RN2 |
MSX ONE design files
The KiCad project lives in the jdgabbard/MSX-ONE-Computer repository on GitHub; these links point at the commit this page was built from.
MSX ONE: common questions
How big is the MSX ONE PCB?
The MSX ONE measures 200 × 150 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the MSX ONE?
107 components, from 58 distinct parts. The full bill of materials is listed on this page.
Where can I download the MSX ONE design files?
From the jdgabbard/MSX-ONE-Computer repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the MSX ONE design in my own project?
Yes, under the terms of its GPL-3.0 license, which jdgabbard chose for the repository.
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