2 layers364 × 203 mm
2 layers364 × 203 mm
Centurion Minicomputer Schematics
- Size
- 364 × 203 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 219
- Nets
- 646
- Pads
- 2,587
- Tracks, vias
- 11,739, 1,337
- Pours
- 17
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 14 May 2022
- Updated
- 1 Jun 2023
Overview
CPU is an open-source printed circuit board by Meisaka, from the Meisaka/CenMiniCom repository on GitHub. It is a 2-layer board of 364 × 203 mm with 219 parts on 646 nets, routed with 11,739 tracks and 1,337 vias.
It is built around the 74LS384N, AM2901CDC and 74LS240DC, with the AM2907/BRA, 74LS377PC and 74LS00SC among its other parts. Its parts include 54 capacitors, 19 resistors and 9 connectors.
Main components
1274LS384N
-- Digital Signal Processors (DSP/DSC) ROHSRochester Electronics, LLCDigital Signal Processors (DSP/DSC)AM2901CDC
CDIP-40Others CDIP-40 Microcontrollers (MCU/MPU/SOC)AMDMicrocontrollers (MCU/MPU/SOC)74LS240DC
--55℃~+125℃ 1 15mA 18ns@5V,45pF 24mA 29mA 4.75V~5.25V 74LS Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, TransceiversTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
AM2907/BRA
PDIP-20-55℃~+125℃ 1 12mA 21ns@5V,50pF 4 4.5V~5.5V 660uA 75mA Am2907 Bidirectional Power-off isolation、Output enable Tri-State PDIP-20 Buffers, Drivers, Receivers, TransceiversAMDBuffers, Drivers, Receivers, Transceivers74LS377PC
PDIP-200℃~+70℃ 1 10ns 25ns@5V,15pF 28mA 30MHz 4.75V~5.25V 400uA 5ns 74LS Series 8 8mA D-Type Rising Edge Synchronous PDIP-20 Flip Flops ROHSTexas InstrumentsFlip Flops
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
74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters
74LS157PC
PDIP-160℃~+70℃ 4.75V~5.25V Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders74LS74PC
DIP-140ns 0℃~+70℃ 1 2 20MHz 3.5pF 35ns@5V,50pF 4.5ns 4.75V~5.25V 400uA 74LS Series 8mA 8mA Asynchronous Complementary D-Type Rising Edge Set and Reset DIP-14 Flip FlopsTexas InstrumentsFlip Flops74LS02PC
DIP-140℃~+70℃ 15ns@5V,15pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA 8mA NOR Gate DIP-14 Logic Gates ROHSonsemiLogic Gates74LS153DC
PDIP-160℃~+70℃ 14ns 4.75V~5.25V 400uA 400uA 6.2mA 74LS Single Supply Tri-state output PDIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
74LS174DC
-0ns 0℃~+70℃ 1 16mA 20ns 30MHz 30ns@5V,15pF 4.75V~5.25V 400uA 6 74LS Series 8mA Asynchronous Push-Pull Reset Rising Edge - Flip Flops ROHSonsemiFlip Flops
README
README.mdVarious Schematics and Utilities for the Centurion Minicomputer
Schematics are reverse engineered from multiple hi-res images of the various cards.
IMPORTANT: Schematics are WIP and may contain mistakes or errors.
Utilities
Useful python3 scripts for investigating disk images
- arcscan.py - scan a raw disk image in the backup format.
- fsscan.py - scan a raw disk image with live file system.
- binstrip.py - clears the MSB of every octet in a file, to make searching for strings easier (outputs to a separate file)
Parts
219| Qty | Value | Footprint | References |
|---|---|---|---|
| 51 | 100nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23 +35 |
| 9 | 74LS669 | Package_DIP:DIP-16_W7.62mm | U_B1, U_B2, U_B5, U_B6, U_C1, U_C2, U_C5, U_C6, U_C15 |
| 8 | 74LS377 | Package_DIP:DIP-20_W7.62mm | U_C9, U_C13, U_F5, U_H5, U_J5, U_K5, U_L5, U_M5 |
| 8 | Fiducial_1.5mm_Mask4.5mm | Fiducial:Fiducial_1.5mm_Mask4.5mm | REF00, REF00, REF02, REF02, REF04, REF04, REF09, REF09 |
| 7 | 74LS00 | Package_DIP:DIP-14_W7.62mm | U_B12, U_D12, U_F14, U_K6, U_K10, U_L6, U_L14 |
| 7 | 74LS04 | Package_DIP:DIP-14_W7.62mm | U_A3, U_A15, U_C8, U_C10, U_E12, U_E14, U_J6 |
| 7 | 74LS157 | Package_DIP:DIP-16_W7.62mm | U_B3, U_B4, U_C3, U_C4, U_C14, U_D6, U_L11 |
| 7 | 76161 | Package_DIP:DIP-24_W15.24mm_Socket | U_MWE2, U_MWF2, U_MWH2, U_MWJ2, U_MWK2, U_MWL2, U_MWM2 |
| 6 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6, R9, R10, R11, R14, R17 |
| 6 | 74LS240 | Package_DIP:DIP-20_W7.62mm | U_A7, U_M6, U_M7, U_M8, U_M14, U_M15 |
| 6 | 74LS74 | Package_DIP:DIP-14_W7.62mm | U_A1, U_B15, U_E15, U_F12, U_L10, U_M9 |
| 6 | 8835 | Package_DIP:DIP-16_W7.62mm | U_A4, U_A5, U_A6, U_A8, U_A9, U_A10 |
| 5 | 74LS138 | Package_DIP:DIP-16_W7.62mm | U_D3, U_E6, U_E7, U_H11, U_K11 |
| 4 | 4.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12, R13, R18, R19 |
| 4 | 74LS02 | Package_DIP:DIP-14_W7.62mm | U_C7, U_D10, U_E8, U_K12 |
| 4 | 74LS153 | Package_DIP:DIP-16_W7.62mm | U_F6, U_J12, U_J13, U_K13 |
| 4 | 74LS174 | Package_DIP:DIP-16_W7.62mm | U_D4, U_D5, U_E5, U_F13 |
| 4 | 74LS378 | Package_DIP:DIP-16_W7.62mm | U_D9, U_D11, U_J9, U_M12 |
| 4 | AM93L422 | Package_DIP:DIP-22_W10.16mm_Socket | U_B9, U_B10, U_D14, U_D15 |
| 4 | MountingHole_2.5mm | MountingHole:MountingHole_2.5mm | REF03, REF05, REF10, REF11 |
| 3 | 330 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3 |
| 3 | 74LS10 | Package_DIP:DIP-14_W7.62mm | U_B11, U_E10, U_E11 |
| 3 | 74LS151 | Package_DIP:DIP-16_W7.62mm | U_J10, U_J11, U_K9 |
| 3 | Conn_02x08_Counter_Clockwise | Connector_PinSocket_2.54mm:PinSocket_2x08_P2.54mm_Vertical | P4, P8, P10 |
| 2 | 1000uF | Capacitor_THT:CP_Axial_L25.0mm_D10.0mm_P30.00mm_Horizontal | C52, C53 |
| 2 | 220/330 | Resistor_THT:R_Array_SIP10 | R4, RN16 |
| 2 | 74LS173 | Package_DIP:DIP-16_W7.62mm | U_C11, U_C12 |
| 2 | 74LS20 | Package_DIP:DIP-14_W7.62mm | U_D8, U_H13 |
| 2 | 74LS259 | Package_DIP:DIP-16_W7.62mm | U_F11, U_M13 |
| 2 | 74LS30 | Package_DIP:DIP-14_W7.62mm | U_B7, U_B8 |
| 2 | 74LS37 | Package_DIP:DIP-14_W7.62mm | U_A13, U_M10 |
| 2 | 74LS38 | Package_DIP:DIP-14_W7.62mm | U_A2, U_A14 |
| 2 | AM2901 | Package_DIP:DIP-40_W15.24mm_Socket | U_F7, U_F9 |
| 2 | AM2907 | Package_DIP:DIP-20_W7.62mm | U_A11, U_A12 |
| 2 | AM2909 | Package_DIP:DIP-28_W15.24mm_Socket | U_J7, U_K7 |
| 2 | Conn_02x13_Top_Bottom | Connector_IDC:IDC-Header_2x13_P2.54mm_Horizontal | P2, P3 |
| 2 | Conn_02x25_Counter_Clockwise | Connector_PinHeader_2.54mm:PinHeader_2x25_P2.54mm_Vertical | P5, P6 |
| 2 | SN74120 | Package_DIP:DIP-16_W7.62mm | U_D7, U_H12 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R15 |
| 1 | 15.000MHz | Crystal:Crystal_HC52-U_Horizontal | XTAL1 |
| 1 | 4.7k | Resistor_THT:R_Array_SIP10 | R7 |
| 1 | 47 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | 470uF | Capacitor_THT:CP_Axial_L18.0mm_D8.0mm_P25.00mm_Horizontal | C39 |
| 1 | 74LS109 | Package_DIP:DIP-16_W7.62mm | U_L13 |
| 1 | 74LS139 | Package_DIP:DIP-16_W7.62mm | U_D2 |
| 1 | 74LS253 | Package_DIP:DIP-16_W7.62mm | U_H6 |
| 1 | 74LS368 | Package_DIP:DIP-16_W7.62mm | U_H14 |
| 1 | 74LS374 | Package_DIP:DIP-20_W7.62mm | U_D13 |
| 1 | 74LS471 | Package_DIP:DIP-20_W7.62mm | U_B13 |
| 1 | AM2911 | Package_DIP:DIP-20_W7.62mm_Socket | U_L9 |
| 1 | Conn_02x07_Counter_Clockwise | Connector_PinSocket_2.54mm:PinSocket_2x07_P2.54mm_Vertical | P7 |
| 1 | Conn_02x36_Top_Bottom | ConnectorsCustom:BUS_EE200 | P1 |
| 1 | D | Diode_THT:D_A-405_P10.16mm_Horizontal | CR1 |
| 1 | Jumper_3_Open | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | SW_DIP_x08 | Button_Switch_THT:SW_DIP_SPSTx08_Slide_9.78x22.5mm_W7.62mm_P2.54mm | DSW1 |
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Questions
How big is the CPU PCB?
It measures 364 × 203 mm and has 2 copper layers, 1.6 mm thick.
What parts does the CPU use?
219 parts, built around the 74LS384N, AM2901CDC, 74LS240DC and AM2907/BRA. 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 CPU KiCad files?
From the Meisaka/CenMiniCom repository on GitHub, at the commit this page was made from: the board is CPU.kicad_pcb and its schematic CPU.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the CPU design in my own project?
Its repository states no licence, so its author keeps all rights: ask Meisaka before reusing the design.