2 layers145.1 × 104.2 mm
2 layers183.9 × 111.3 mm
C1581
sjgray/C158120Commodore 1581 Disk Drive
- Size
- 183.9 × 111.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 80
- Nets
- 148
- Pads
- 518
- Tracks, vias
- 2,114, 149
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 7 Feb 2024
- Updated
- 8 Dec 2025
Overview
C1581 is an open-source printed circuit board by sjgray, from the sjgray/C1581 repository on GitHub. It is a 2-layer board of 183.9 × 111.3 mm with 80 parts on 148 nets, routed with 2,114 tracks and 149 vias.
It is built around the 74LS241P-E, 74LS00SC and 74LS139PC, with the 74LS14PC, 74LS93SC and L7805 among its other parts. Its parts include 20 capacitors, 14 ICs, 14 connectors, 12 resistors and 3 diodes.
Main components
6
74LS241P-E
-- Interface - Specialized ROHSRenesas ElectronicsInterface - Specialized
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates
74LS139PC
PDIP-1622ns 74LS 8mA Decoder Single Supply PDIP-16 Signal Switches, Multiplexers, DecodersonsemiSignal Switches, Multiplexers, Decoders
74LS14PC
PDIP-14InvertersTexas Instruments74LS93SC
-- Counters, DividersTexas InstrumentsCounters, Dividers
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
Parts
80| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 0.1uF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14 |
| 6 | 47 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R1, R3, R6, R9, R10, R11 |
| 6 | FB | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | FB1, FB2, FB3, FB4, FB5, FB6 |
| 4 | 100pf | LittleSixteen:EMI_Filter | EM1, EM2, EM3, EM4 |
| 3 | 1K | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R2, R4, R14 |
| 2 | 10uF | c64c-library:CAP_RADIAL_P5.08MM_D6MM | C18, C22 |
| 2 | 1K | Resistor_THT:R_Array_SIP9 | RP1, RP11 |
| 2 | 7405 | Package_DIP:DIP-14_W7.62mm_LongPads | U8, U12 |
| 2 | IEC | c64c-library:SERIAL_CON_DIN6 | CN3, CN4 |
| 1 | .1uF | c64c-library:CAP_RADIAL_P5.08MM_D6MM | C91 |
| 1 | 0.01uF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C15 |
| 1 | 0.33uF | c64c-library:CAP_RADIAL_P5.08MM_D6MM | C90 |
| 1 | 150 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R13 |
| 1 | 1N914 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | 2.7K | Resistor_THT:R_Array_SIP8 | RP2 |
| 1 | 2.7K | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R5 |
| 1 | 27C512 | Package_DIP:DIP-28_W15.24mm | U2 |
| 1 | 47uF | c64c-library:CAP_RADIAL_P5.08MM_D6MM | C20 |
| 1 | 620 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R12 |
| 1 | 6502 | Package_DIP:DIP-40_W15.24mm_LongPads | U1 |
| 1 | 6526 | Package_DIP:DIP-40_W15.24mm_LongPads | U5 |
| 1 | 7407 | Package_DIP:DIP-14_W7.62mm_LongPads | U11 |
| 1 | 74LS00 | Package_DIP:DIP-14_W7.62mm_LongPads | U7 |
| 1 | 74LS139 | Package_DIP:DIP-16_W7.62mm_LongPads | U6 |
| 1 | 74LS14 | Package_DIP:DIP-14_W7.62mm_LongPads | U9 |
| 1 | 74LS241 | Package_DIP:DIP-20_W7.62mm_LongPads | U13 |
| 1 | 74LS93 | Package_DIP:DIP-14_W7.62mm_LongPads | U10 |
| 1 | Barrel_Jack | Connector_BarrelJack:BarrelJack_Horizontal | J90 |
| 1 | CXO_DIP8 | Oscillator:Oscillator_DIP-8 | X1 |
| 1 | DEVICE ID | Button_Switch_THT:SW_DIP_SPSTx02_Piano_10.8x6.64mm_W7.62mm_P2.54mm | SW1 |
| 1 | DIN-4 | SJG-Footprints:DIN-4 | CN6 |
| 1 | DRIVE SELECT | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J3 |
| 1 | EXTERNAL POWER | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | CN8 |
| 1 | FDC TYPE | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | FLOPPY | Connector_PinHeader_2.54mm:PinHeader_2x17_P2.54mm_Vertical | CN2 |
| 1 | FLOPPY POWER | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | CN1 |
| 1 | GRN LED | LED_THT:LED_D1.8mm_W3.3mm_H2.4mm | D3 |
| 1 | INTERNAL IEC | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | CN7 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Vertical | U90 |
| 1 | LEDS | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | CN5 |
| 1 | PIN2 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | PIN34 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | RED LED | LED_THT:LED_D1.8mm_W3.3mm_H2.4mm | D2 |
| 1 | ROM SELECT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | UM61256 | Package_DIP:DIP-28_W7.62mm_LongPads | U3 |
| 1 | WD1770 | Package_DIP:DIP-28_W15.24mm_LongPads | U4 |
| 1 | XLEDS | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | CN9 |
| 1 | ~ | LittleSixteen:C64_PowerSwitch | SW2 |
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Questions
How big is the C1581 PCB?
It measures 183.9 × 111.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the C1581 use?
80 parts, built around the 74LS241P-E, 74LS00SC, 74LS139PC and 74LS14PC. 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 C1581 KiCad files?
From the sjgray/C1581 repository on GitHub, at the commit this page was made from: the board is Enhanced/PROTO2/C1581.kicad_pcb and its schematic Enhanced/PROTO1/C1581.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the C1581 design in my own project?
Its repository states no licence, so its author keeps all rights: ask sjgray before reusing the design.