Yddraig
About the Yddraig PCB
Yddraig is an open source PCB design by ddraig68k, published on GitHub under the MIT license. It is a 4-layer board measuring 340 × 210 mm, with 214 components from 69 distinct parts.
Other key parts include the 74HCT14, 74HCT74, 74LS06, NE555P and 68000D. By type, the board carries 69 capacitors, 63 resistors, 35 ICs, 15 diodes, 14 connectors and 8 transistors.
From the project
Schematic and CAD files for my 68K based computer
The CPU used by Y Ddraig is the Motorola 68000 running at 10 MHz. The 68000 has a 16-bit data bus and 24-bit address bus internally runs as a full 32-bit machine. The 68000 has 8 general purpose data registers D0-D7 and 8 address registers A0-A7. The address register A7 is also used as a special purpose register holding the stack pointer.
There is 512K of EEPROM available supplied by two 256K x 8-bit SST39SF020 devices for the ODD and EVEN addresses.
Main components on the Yddraig
Yddraig bill of materials (BOM)
214 components, 69 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HCT14 | DIP-14_W7.62mm_Socket | U201 |
| 1 | 74HCT74 | DIP-14_W7.62mm_Socket | U202 |
| 2 | 74LS06 | DIP-14_W7.62mm_Socket | U301, U503 |
| 1 | NE555P | DIP-8_W7.62mm | U302 |
| 1 | 68000D | DIP-64_W22.86mm_Socket | U303 |
| 1 | 74LS32 | DIP-14_W7.62mm_Socket | U304 |
| 2 | SST39SF040 | DIP-32_W15.24mm_Socket | U305, U306 |
| 2 | AS6C4008-55PCN | DIP-32_W15.24mm_Socket | U307, U308 |
| 1 | 74HC164 | DIP-14_W7.62mm_Socket | U401 |
| 2 | 74LS08 | DIP-14_W7.62mm_Socket | U402, U405 |
| 1 | 74LS148 | DIP-16_W7.62mm_Socket | U403 |
| 1 | XC95108PC84 | PLCC-84_THT-Socket | U404 |
| 1 | 74LS04 | DIP-14_W7.62mm_Socket | U406 |
| 1 | 68681 | DIP-40_W15.24mm_Socket | U501 |
| 1 | VT82C42 | DIP-40_W15.24mm_Socket | U502 |
| 2 | MAX202 | DIP-16_W7.62mm_Socket | U504, U506 |
| 1 | 68230 | DIP-48_W15.24mm_Socket | U505 |
| 1 | RTC-72421 | DIP-18_W7.62mm_Socket | U601 |
| 1 | 74LS139 | DIP-16_W7.62mm_Socket | U602 |
| 3 | 74LS157 | DIP-16_W7.62mm_Socket | U701, U702, U703 |
Show 49 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS21 | DIP-14_W7.62mm | U801 |
| 3 | 74LS541 | DIP-20_W7.62mm_Socket | U901, U902, U903 |
| 4 | 74LS245 | DIP-20_W7.62mm_Socket | U904, U905, U906, U907 |
| 6 | 2N4403 | TO-92 | Q401, Q402, Q403, Q501, Q502, Q602 |
| 1 | BC549B | TO-92 | Q601 |
| 1 | 2N7000 | TO-92_Inline | Q603 |
| 1 | 40MHz | Oscillator_DIP-14 | X401 |
| 1 | CXO_DIP8 | Oscillator_DIP-8 | X501 |
| 1 | 3.6864MHz | Crystal_HC18-U_Vertical | Y501 |
| 1 | ATX-24 | 1-1775099-3 | J201 |
| 1 | ExtPWR | PinHeader_1x02_P2.54mm_Vertical | J202 |
| 1 | PWRLED | PinHeader_1x02_P2.54mm_Vertical | J203 |
| 1 | Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | J301 |
| 1 | NMI Reset | PinHeader_1x02_P2.54mm_Vertical | J401 |
| 1 | Ext RUN LED | PinHeader_1x02_P2.54mm_Vertical | J402 |
| 1 | Conn_01x06 | PinHeader_1x06_P2.54mm_Vertical | J403 |
| 1 | Keyboard | MINI-DIN-6-FULL-SHIELD | J501 |
| 1 | Mouse | MINI-DIN-6-FULL-SHIELD | J502 |
| 1 | IDE LED | PinHeader_1x02_P2.54mm_Vertical | J601 |
| 1 | IDE 5V | PinHeader_1x02_P2.54mm_Vertical | J602 |
| 1 | IDE_Interface | IDC-Header_2x20_P2.54mm_Vertical | J603 |
| 2 | SIMM-30 | SIMM-30 | J701, J702 |
| 1 | CR2032 | BatteryHolder_Keystone_103_1x20mm | BT601 |
| 4 | D68K_64PIN_PCB | DIN41612_C_2x32_Female_Vertical_THT | EXP801, EXP802, EXP803, EXP804 |
| 2 | SW_SPST | SW_PUSH_6mm_H4.3mm | SW201, SW301 |
| 2 | BLUE | LED_D5.0mm | D201, D601 |
| 3 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D202, D205, D602 |
| 8 | GREEN | LED_D5.0mm | D203, D204, D206, D207, D208, D403, D501, D502 |
| 2 | RED | LED_D5.0mm | D401, D402 |
| 6 | 47uF | CP_Radial_D5.0mm_P2.50mm | C201, C203, C701, C704, C707, C709 |
| 53 | 100nF | C_Disc_D3.8mm_W2.6mm_P2.50mm | C202, C204, C205, C206, C304, C305, C306, C307 +45 |
| 1 | 1uF | CP_Radial_D5.0mm_P2.50mm | C207 |
| 6 | 10uF | CP_Radial_D5.0mm_P2.50mm | C208, C301, C303, C605, C702, C705 |
| 1 | 10nF | C_Disc_D3.8mm_W2.6mm_P2.50mm | C302 |
| 1 | 10pF | C_Disc_D3.8mm_W2.6mm_P2.50mm | C501 |
| 1 | 5pF | C_Disc_D3.8mm_W2.6mm_P2.50mm | C502 |
| 8 | 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R201, R205, R306, R502, R503, R607, R608, R609 |
| 1 | 470R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R202 |
| 7 | 330R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R203, R206, R207, R208, R210, R604, R605 |
| 2 | 680R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R204, R209 |
| 13 | 4K7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R301, R302, R303, R304, R305, R307, R309, R401 +5 |
| 1 | 38K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R308 |
| 4 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R402, R404, R406, R508 |
| 8 | 150R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R403, R405, R407, R408, R504, R505, R506, R507 |
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R606 |
| 2 | 22R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R701, R702 |
| 5 | 10K | R_Array_SIP9 | RN401, RN801, RN802, RN906, RN907 |
| 6 | 22R | R_Array_SIP8 | RN601, RN602, RN701, RN702, RN703, RN704 |
| 5 | 22R | DIP-16_W7.62mm | RN901, RN902, RN903, RN904, RN905 |
Yddraig design files
The KiCad project lives in the ddraig68k/hardware repository on GitHub; these links point at the commit this page was built from.
- Layoutyddraig/yddraig.kicad_pcb
- Schematicyddraig/yddraig.kicad_sch
Yddraig: common questions
How big is the Yddraig PCB?
The Yddraig measures 340 × 210 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Yddraig?
214 components, from 69 distinct parts. The full bill of materials is listed on this page.
Where can I download the Yddraig design files?
From the ddraig68k/hardware repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Yddraig design in my own project?
Yes, under the terms of its MIT license, which ddraig68k chose for the repository.
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