4 layers100 × 100 mm
4 layers340 × 210 mm
Yddraig
ddraig68k/hardware29Schematic and CAD files for my 68K based computer
- Size
- 340 × 210 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 224
- Nets
- 480
- Pads
- 1,787
- Tracks, vias
- 4,848, 1,042
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 22 Mar 2021
- Updated
- 10 Oct 2026
Overview
Yddraig is an open-source printed circuit board by ddraig68k, from the ddraig68k/hardware repository on GitHub, published under the MIT licence. It is a 4-layer board of 340 × 210 mm with 224 parts on 480 nets, routed with 4,848 tracks and 1,042 vias.
It is built around the 74LS245SC, MAX202ID and 74LS157PC, with the AS6C4008-55PCN, 74HC164 and 74HCT14D among its other parts. Its parts include 69 capacitors, 47 resistors, 35 ICs, 17 connectors and 15 diodes. It belongs with the FPGA and CPLD boards of this library.
Main components
1274LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
MAX202ID
SOIC-16-40℃~+85℃ 120Kbps 2 2 4.5V~5.5V 8mA Transceiver Yes ±15kV SOIC-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs
74LS157PC
PDIP-160℃~+70℃ 4.75V~5.25V Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
AS6C4008-55PCN
PDIP-320℃~+70℃ 2.7V~5.5V 30mA 4Mbit 4uA 55ns Parallel Port (Parallel) PDIP-32 SRAM ROHSAlliance MemorySRAM
74HC164
SOP-140℃~+70℃ 1 24ns@5V,16pF 2V~6V 74HC 8 Serial-to-Parallel SOP-14 Shift Registers ROHSGRShift Registers74HCT14D
SOP-14-40℃~+125℃ 1 1.9V~2.1V 2uA 34ns@4.5V,50pF 4.4V 4.5V~5.5V 400mV 4mA 4mA 500mV~600mV 6 74HCT Schmitt trigger SOIC-14 Inverters ROHSNexperiaInverters74HCT74D
SOIC-14-40℃~+125℃ 1 2 3.5pF 3ns 4.5V~5.5V 40uA 44ns@4.5V,50pF 4mA 4mA 59MHz 5ns 74HCT Series Asynchronous Complementary D-Type Rising Edge Set and Reset SO-14 Flip Flops ROHSNexperia74 Series
74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters74LS139PC
PDIP-1622ns 74LS 8mA Decoder Single Supply PDIP-16 Signal Switches, Multiplexers, DecodersonsemiSignal Switches, Multiplexers, Decoders74LS148P-E
DIP-16-20℃~+75℃ 10mA 15ns@5V,15pF 4.75V~5.25V 400uA 74LS 8mA Decoder DIP-16 Signal Switches, Multiplexers, Decoders ROHSRenesas ElectronicsSignal Switches, Multiplexers, Decoders74LS21PC
DIP-140℃~+70℃ 18ns@5V,50pF 2 2.7V~3.4V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA AND Gate DIP-14 Logic Gates ROHSonsemiLogic Gates
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
README
expansion/GfxV9990/README.mdV9990 Video card
The V9990 was intended as a successor to the V9958 (or supposedly a stripped down version of the never finished Yamaha V9978), but while the other chips in the range had backwards compatibility with the previous generation, the V9990 has some similar functionality but lacks the backwards compatibility.
Still, the V9990 has impressive specifications for the time, some of the features include:
Game Specifications:
For this type, there are two pattern display modes.
- P1 (Display resolution 256 x 212 2 screens)
- P2 (Display resolution 512 x 212)
Various highly advanced functions are available such as powerful sprite function and omnidirectional scroll function.
AV Specifications:
For this type, there are four kinds of bitmap display modes which can be displayed on the NTSC or PAL frequency monitor as follows.
- B1 (Display resolution 256 x 212)
- B2 (Display resolution 384 x 240)
- B3 (Display resolution 512 x 212)
- B4 (Display resolution 768 x 240)
Capable of doubling the resolution in the vertical direction by using interlace. Display is possible up to 32,768 colors/dot. Built-in color palette (64 colors selected out of 32,768 colors). Omnidirectional smooth scrolling is possible.
Like the V9958 card, the V9990 has Composite, S-Video and RGB output. The board has 518K of RAM installed and again uses CXA2075M encoder to provide the video output signals.
V9990 Text mode
Rygar scrolling test: https://www.youtube.com/watch?v=J7Ad2eaiAFY
Parts
224| Qty | Value | Footprint | References |
|---|---|---|---|
| 53 | 100nF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C202, C204, C205, C206, C304, C305, C306, C307, C308, C309, C310, C311, C401, C402, C403, C404 +37 |
| 13 | 4K7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R301, R302, R303, R304, R305, R307, R309, R401, R409, R501, R601, R602, R603 |
| 8 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R201, R205, R306, R502, R503, R607, R608, R609 |
| 8 | 150R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R403, R405, R407, R408, R504, R505, R506, R507 |
| 8 | GREEN | LED_THT:LED_D5.0mm | D203, D204, D206, D207, D208, D403, D501, D502 |
| 7 | 330R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R203, R206, R207, R208, R210, R604, R605 |
| 6 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C208, C301, C303, C605, C702, C705 |
| 6 | 22R | Resistor_THT:R_Array_SIP8 | RN601, RN602, RN701, RN702, RN703, RN704 |
| 6 | 2N4403 | Package_TO_SOT_THT:TO-92 | Q401, Q402, Q403, Q501, Q502, Q602 |
| 6 | 47uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C201, C203, C701, C704, C707, C709 |
| 6 | MountingHole | MountingHole:MountingHole_4.3mm_M4 | H101, H102, H103, H104, H105, H106 |
| 5 | 10K | Resistor_THT:R_Array_SIP9 | RN401, RN801, RN802, RN906, RN907 |
| 5 | 22R | Package_DIP:DIP-16_W7.62mm | RN901, RN902, RN903, RN904, RN905 |
| 4 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R402, R404, R406, R508 |
| 4 | 74LS245 | Package_DIP:DIP-20_W7.62mm_Socket | U904, U905, U906, U907 |
| 4 | D68K_64PIN_PCB | Ddraig:DIN41612_C_2x32_Female_Vertical_THT | EXP801, EXP802, EXP803, EXP804 |
| 3 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D202, D205, D602 |
| 3 | 74LS157 | Package_DIP:DIP-16_W7.62mm_Socket | U701, U702, U703 |
| 3 | 74LS541 | Package_DIP:DIP-20_W7.62mm_Socket | U901, U902, U903 |
| 2 | 22R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R701, R702 |
| 2 | 680R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R204, R209 |
| 2 | 74LS06 | Package_DIP:DIP-14_W7.62mm_Socket | U301, U503 |
| 2 | 74LS08 | Package_DIP:DIP-14_W7.62mm_Socket | U402, U405 |
| 2 | AS6C4008-55PCN | Package_DIP:DIP-32_W15.24mm_Socket | U307, U308 |
| 2 | BLUE | LED_THT:LED_D5.0mm | D201, D601 |
| 2 | MAX202 | Package_DIP:DIP-16_W7.62mm_Socket | U504, U506 |
| 2 | RED | LED_THT:LED_D5.0mm | D401, D402 |
| 2 | SIMM-30 | Ddraig:SIMM-30 | J701, J702 |
| 2 | SST39SF040 | Package_DIP:DIP-32_W15.24mm_Socket | U305, U306 |
| 2 | SW_SPST | Button_Switch_THT:SW_PUSH_6mm_H4.3mm | SW201, SW301 |
| 1 | 10nF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C302 |
| 1 | 10pF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C501 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R606 |
| 1 | 1uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C207 |
| 1 | 2N7000 | Package_TO_SOT_THT:TO-92_Inline | Q603 |
| 1 | 3.6864MHz | Crystal:Crystal_HC18-U_Vertical | Y501 |
| 1 | 38K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R308 |
| 1 | 40MHz | Oscillator:Oscillator_DIP-14 | X401 |
| 1 | 470R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R202 |
| 1 | 5pF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C502 |
| 1 | 68000D | Package_DIP:DIP-64_W22.86mm_Socket | U303 |
| 1 | 68230 | Package_DIP:DIP-48_W15.24mm_Socket | U505 |
| 1 | 68681 | Package_DIP:DIP-40_W15.24mm_Socket | U501 |
| 1 | 74HC164 | Package_DIP:DIP-14_W7.62mm_Socket | U401 |
| 1 | 74HCT14 | Package_DIP:DIP-14_W7.62mm_Socket | U201 |
| 1 | 74HCT74 | Package_DIP:DIP-14_W7.62mm_Socket | U202 |
| 1 | 74LS04 | Package_DIP:DIP-14_W7.62mm_Socket | U406 |
| 1 | 74LS139 | Package_DIP:DIP-16_W7.62mm_Socket | U602 |
| 1 | 74LS148 | Package_DIP:DIP-16_W7.62mm_Socket | U403 |
| 1 | 74LS21 | Package_DIP:DIP-14_W7.62mm | U801 |
| 1 | 74LS32 | Package_DIP:DIP-14_W7.62mm_Socket | U304 |
| 1 | ATX-24 | Ddraig:1-1775099-3 | J201 |
| 1 | BC549B | Package_TO_SOT_THT:TO-92 | Q601 |
| 1 | CR2032 | Battery:BatteryHolder_Keystone_103_1x20mm | BT601 |
| 1 | CXO_DIP8 | Oscillator:Oscillator_DIP-8 | X501 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J301 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J403 |
| 1 | Ext RUN LED | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J402 |
| 1 | ExtPWR | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J202 |
| 1 | IDE 5V | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J602 |
| 1 | IDE LED | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J601 |
| 1 | IDE_Interface | Connector_IDC:IDC-Header_2x20_P2.54mm_Vertical | J603 |
| 1 | Keyboard | Ddraig:MINI-DIN-6-FULL-SHIELD | J501 |
| 1 | LOGO | Ddraig:Ddraig68k-40mm | G*** |
| 1 | Mouse | Ddraig:MINI-DIN-6-FULL-SHIELD | J502 |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U302 |
| 1 | NMI Reset | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J401 |
| 1 | PWRLED | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J203 |
| 1 | Parallel | Connector_Dsub:DSUB-25_Female_Horizontal_P2.77x2.84mm_EdgePinOffset7.70mm_Housed_MountingHolesOffset9.12mm | J505 |
| 1 | RTC-72421 | Package_DIP:DIP-18_W7.62mm_Socket | U601 |
| 1 | Serial1 | Connector_Dsub:DSUB-9_Male_Horizontal_P2.77x2.84mm_EdgePinOffset4.94mm_Housed_MountingHolesOffset7.48mm | J503 |
| 1 | Serial2 | Connector_Dsub:DSUB-9_Male_Horizontal_P2.77x2.84mm_EdgePinOffset4.94mm_Housed_MountingHolesOffset7.48mm | J504 |
| 1 | VT82C42 | Package_DIP:DIP-40_W15.24mm_Socket | U502 |
| 1 | XC95108PC84 | Package_LCC:PLCC-84_THT-Socket | U404 |
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Questions
How big is the Yddraig PCB?
It measures 340 × 210 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Yddraig use?
224 parts, built around the 74LS245SC, MAX202ID, 74LS157PC and AS6C4008-55PCN. 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 Yddraig KiCad files?
From the ddraig68k/hardware repository on GitHub, at the commit this page was made from: the board is yddraig/yddraig.kicad_pcb and its schematic expansion/AudioSID/AudioSID.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Yddraig design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).