Omega-Mainboard
About the Omega-Mainboard PCB
Omega-Mainboard is an open source PCB design by msx-solis, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 333.4 × 149.9 mm, with 248 components from 97 distinct parts.
Other key parts include the Z84C00, 82C55, V9938/V9958, YM2149 and RP5C01. By type, the board carries 94 capacitors, 49 ICs, 48 resistors, 14 connectors, 8 jumpers and 3 crystals.
From the project
update for the OMEGA HOME COMPUTER mainboard pcb.
a) Din-8 connectors used are more common on EU than in 1.4us version.
b) the jumpers for selecting the mapper changes are not connected so a cutout of the traces is not needed.
Main components on the Omega-Mainboard
Omega-Mainboard bill of materials (BOM)
248 components, 97 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Z84C00 | IC_DIP40_600 | U1 |
| 1 | 82C55 | IC_DIP40_600 | U2 |
| 1 | V9938/V9958 | IC_SDIP64_600 | U3 |
| 1 | YM2149 | IC_DIP40_600 | U4 |
| 1 | RP5C01 | IC_DIP18_300 | U5 |
| 1 | SST39SF040 | IC_DIP32_600 | U6 |
| 1 | AS6C4008 | IC_DIP32_600 | U7 |
| 4 | D41464 | IC_DIP18_300 | U8, U9, U10, U11 |
| 3 | ATF16V8B | IC_DIP20_300 | U12, U13, U14 |
| 4 | 74HCT670 | IC_DIP16_300 | U15, U16, U17, U18 |
| 3 | 74F541 | IC_DIP20_300 | U19, U20, U21 |
| 1 | 74HCT540 | IC_DIP20_300 | U22 |
| 2 | 74HCT273 | IC_DIP20_300 | U23, U24 |
| 2 | 74F245 | IC_DIP20_300 | U25, U26 |
| 1 | 74HCT175 | IC_DIP16_300 | U27 |
| 2 | 74HCT157 | IC_DIP16_300 | U28, U29 |
| 2 | 74HCT153 | IC_DIP16_300 | U30, U31 |
| 1 | 74AHCT138 | IC_DIP16_300 | U32 |
| 1 | 74AHCT125 | IC_DIP14_300 | U33 |
| 3 | 74HCT74 | IC_DIP14_300 | U34, U35, U36 |
Show 77 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 74AHCT32 | IC_DIP14_300 | U37, U38, U39 |
| 2 | 74HCT30 | IC_DIP14_300 | U40, U41 |
| 1 | 74LS07 | IC_DIP14_300 | U42 |
| 1 | 74HCT04 | IC_DIP14_300 | U43 |
| 1 | 74AHCT02 | IC_DIP14_300 | U44 |
| 1 | 74HCT00 | IC_DIP14_300 | U45 |
| 1 | ADM691A | IC_DIP16_300 | U46 |
| 1 | CXA1645 | IC_DIP24_400 | U47 |
| 1 | MCP6281 | IC_DIP8_300 | U48 |
| 1 | LM311 | IC_DIP8_300 | U49 |
| 2 | PN2907A | Transistor_TO92_EBC_254 | Q1, Q2 |
| 1 | 21.477270MHz | Crystal_HC-49U_Vert | Y1 |
| 1 | 32768 Hz | Crystal_32K_Horiz | Y2 |
| 1 | 4.433618MHz | Crystal_HC-49U_Vert | Y3 |
| 1 | 5V | Conn_Power_Jack_Circular_Pads | J1 |
| 1 | Composite | Conn_RCA_Right | J2 |
| 1 | Audio | Conn_RCA_Right | J3 |
| 1 | S-VIDEO | Conn_Mini_DIN_4pin | J4 |
| 1 | RGB | DIN8 | J5 |
| 1 | Cassette | DIN8 | J6 |
| 1 | JOYSTICK_A | Conn_Dsub_DE9M | J7 |
| 1 | JOYSTICK_B | Conn_Dsub_DE9M | J8 |
| 1 | PRINTER | Conn_Micro_Ribbon_14F | J9 |
| 1 | POWER | Conn_Friction_Lock_8P_2.54mm | J10 |
| 1 | KEYBOARD | Conn_Pin_Header_8x2_2.54mm | J11 |
| 1 | RAM_EXT | Conn_Pin_Header_20x2_2.54mm | J12 |
| 1 | ~RST~/~NMI | Conn_Pin_Header_2x2_2.54mm | J13 |
| 1 | CBUS | Conn_Pin_Header_13x1_2.54mm | J14 |
| 1 | CR2032 | Battery_Holder_CR2032_Universal | BT1 |
| 1 | 750mA | Cap_Cer_508 | F1 |
| 11 | HOLE | Hole_3mm | HOLE1, HOLE2, HOLE3, HOLE4, HOLE5, HOLE6, HOLE7, HOLE8 +3 |
| 1 | ROM_A18 | Conn_Pin_Header_2x1_2.54mm | JP1 |
| 1 | KBD_TYPE | Conn_Pin_Header_2x1_2.54mm | JP2 |
| 2 | V9938/V9958 | Conn_Pin_Header_3x1_2.54mm | JP3, JP4 |
| 2 | NTSC/PAL | Conn_Pin_Header_3x1_2.54mm | JP5, JP6 |
| 2 | RAM_SIZE | Conn_Pin_Header_2x3_2.54mm | JP7, JP8 |
| 4 | 10k | Conn_SIL10 | RR1, RR2, RR3, RR4 |
| 3 | 4.7k | Conn_SIL10 | RR5, RR6, RR7 |
| 2 | 4.7k | Conn_SIL6 | RR8, RR10 |
| 1 | 470 | Conn_SIL6 | RR9 |
| 1 | Relay_5V | Relay_SPDT | RY1 |
| 2 | MSX_SLOT_HOST | Conn_Edge_50P | SLOT1, SLOT2 |
| 1 | 1N4148 | Diode_762 | D1 |
| 1 | 68uH | Res_762 | L1 |
| 2 | 5.6uH | Res_762 | L2, L3 |
| 58 | 0.1uF | Cap_Cer_508 | C1, C2, C3, C4, C5, C6, C7, C8 +50 |
| 6 | 220uF | Cap_Elec_Radial_10mm | C59, C60, C61, C62, C63, C64 |
| 3 | 100uF | Cap_Elec_Radial_6.3mm | C65, C66, C67 |
| 3 | 10uF | Cap_Pol_508_3 | C68, C69, C70 |
| 7 | 10uF | Cap_Elec_Radial_5mm | C71, C72, C73, C74, C75, C76, C77 |
| 1 | 1uF | Cap_Elec_Radial_5mm | C78 |
| 2 | 22nF | Cap_Cer_508 | C79, C80 |
| 1 | 1.5nF | Cap_Cer_508 | C81 |
| 3 | 330pF | Cap_Cer_508 | C82, C83, C84 |
| 1 | 47pF | Cap_Cer_508 | C85 |
| 2 | 33pF | Cap_Cer_508 | C86, C87 |
| 3 | 30pF | C_Trim_Murata | C88, C89, C90 |
| 1 | 27pF | Cap_Cer_508 | C91 |
| 2 | 22pF | Cap_Cer_508 | C92, C93 |
| 1 | 4.7pF | Cap_Cer_508 | C94 |
| 1 | 1M | Res_762 | R1 |
| 2 | 470k | Res_762 | R2, R3 |
| 1 | 220k | Res_762 | R4 |
| 2 | 100k | Res_762 | R5, R6 |
| 2 | 47k | Res_762 | R7, R8 |
| 2 | 20k | Res_762 | R9, R10 |
| 4 | 10k | Res_762 | R11, R12, R13, R14 |
| 1 | 5.6k | Res_762 | R15 |
| 7 | 4.7k | Res_762 | R16, R17, R18, R19, R20, R21, R22 |
| 2 | 2.7k | Res_762 | R23, R24 |
| 2 | 2.2k | Res_762 | R25, R26 |
| 7 | 1k | Res_762 | R27, R28, R29, R30, R31, R32, R33 |
| 1 | 470 | Res_762 | R34 |
| 1 | 180 | Res_762 | R35 |
| 1 | 120 | Res_762 | R36 |
| 6 | 100 | Res_762 | R37, R38, R39, R40, R41, R42 |
| 6 | 75 | Res_762 | R43, R44, R45, R46, R47, R48 |
Omega-Mainboard design files
The KiCad project lives in the msx-solis/omega_mainboard1.4eu repository on GitHub; these links point at the commit this page was built from.
Omega-Mainboard: common questions
How big is the Omega-Mainboard PCB?
The Omega-Mainboard measures 333.4 × 149.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Omega-Mainboard?
248 components, from 97 distinct parts. The full bill of materials is listed on this page.
Where can I download the Omega-Mainboard design files?
From the msx-solis/omega_mainboard1.4eu repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Omega-Mainboard design in my own project?
Yes, under the terms of its GPL-3.0 license, which msx-solis chose for the repository.
