

HC2000
HC2000 Project
- Size
- 478 × 183 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 259
- Nets
- 479
- Pads
- 1,929
- Tracks, vias
- 6,876, 1,147
- Pours
- 12
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 5 Apr 2023
- Updated
- 23 Jul 2023
Overview
HC2000 is an open-source printed circuit board by badrianiulian, from the badrianiulian/HC2000 repository on GitHub. It is a 2-layer board of 478 × 183 mm with 259 parts on 479 nets, routed with 6,876 tracks and 1,147 vias.
It is built around the 74LS125DC, 74LS74PC and 74LS161DC, with the 74LS257PC, 74LS32SC and 74LS04PC among its other parts. Its parts include 77 resistors, 17 capacitors, 8 diodes, 5 connectors and 1 transistor.
Main components
1274LS125DC
-0℃~+70℃ 1 10ns@5.5V,50pF 15mA 18mA 24mA 4 4.5V~5.5V 74LS Power-off isolation、Output enable Tri-State Unidirectional - Buffers, Drivers, Receivers, TransceiversTexas InstrumentsBuffers, Drivers, Receivers, Transceivers74LS74PC
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 Flops74LS161DC
-0℃~+70℃ 14ns 32MHz 4 4.75V~5.25V 74LS 93mW Asynchronous Binary Counter Programmable divide ratio、Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous - Counters, DividersTexas InstrumentsCounters, Dividers74LS257PC
DIP-160℃~+70℃ 12mA 2.6mA 24mA 27ns@5V,150pF 4.75V~5.25V 74LS Output enable high-impedance、Tri-state output DIP-16 Signal Switches, Multiplexers, DecodersTexas InstrumentsSignal Switches, Multiplexers, Decoders74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters74LS175PC
PDIP-160℃~+70℃ 1 10ns 18mA 25ns@5V,15pF 30MHz 4 4.75V~5.25V 5ns 74LS Series Asynchronous Complementary type D-Type Reset Rising Edge PDIP-16 Flip Flops ROHSTexas InstrumentsFlip Flops74LS374PC
PDIP-200ns 0℃~+70℃ 1 20ns 28ns@5V,45pF 35MHz 4.75V~5.25V 45mA 74LS Series 8 D-Type Rising Edge Tri-State PDIP-20 Flip FlopsonsemiFlip Flops74LS00SC
-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 Gates74LS09P-E
DIP-14-20℃~+75℃ 100uA 2 2V 35ns@5V,15pF 4 4.75V~5.25V 500mV 74LS 800mV 8mA AND Gate Open Collector DIP-14 Logic Gates ROHSRenesas ElectronicsLogic Gates74LS174DC
-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 Flops74LS05P-E
-- Inverters ROHSRenesas ElectronicsLogic Gates
README
README.mdHC2000
Note în limba română
Proiect de reconstrucție HC2000
Ce s-a folosit pentru a crea acest proiect:
- Versiunea originală a schemei HC-2000 Rev B care a fost obținută prin intermediul grupului Romanian Home Computer (mulțumiri speciale domnului George Chirtoacă)
- Schema Eagle a HC-2000 Rev B realizată de dl. Liviu Grama, care este de asemenea membru al grupului Romanian Home Computer
- Un exemplar fizic al unui HC-2000 Rev E furnizat de dl. Oică Cezar pentru reparații
Note despre diferențe:
- HC2000_ORIGINAL este proiectul realizat folosind scanările cablajului exemplarului fizic HC-2000 Rev E
- gerberele au fost create folosind proiectul HC2000, care este Rev E modificată pentru a include firele lipite peste cablaj
- observați că unele componente au două valori precum R28, R40 și R41 egale cu 220/1K: prima valoare 220 este pentru Rev B și a doua valoare 1K este pentru Rev E
- unde se întâlnește un "-", înseamnă că acea componentă lipsește pe cablajul Rev E, dar locul de amplasare al componentei este disponibil
- pentru conectorul de alimentare am adăugat pe lângă locul de amplasare al conectorului original, un conector cu 6 pini DIN
IMPORTANT: În prima revizie a proiectului s-au strecurat câteva greșeli:
- Nu am observat o tăietură pe placa originală ceea ce a dus la unirea a două trasee. Această secțiune este documentată pe grupul Romanian Home Computer de Radioman V: https://groups.google.com/g/romanianhomecomputer/c/qHbKBThCIQc/m/c_SBp--mCgAJ
- Au rămas două circuite cu titulatura veche de pe proiectul original care a fost convertit
English notes
HC2000 rebuild project
What was used to create this project:
- Original version of the schematic of HC-2000 Rev B that was obtained through the Romanian Home Computer group (special thanks to mr. George Chirtoacă)
- Eagle schematic of the HC-2000 Rev B made by mr. Liviu Grama also a member of the Romanian Home Computer group
- A physical HC-2000 Rev E provided by mr. Oică Cezar for repairs
Notes on the diferences:
- HC2000_ORIGINAL is the project made using PCB scans of the physical HC-2000 Rev E
- gerbers were created using HC2000 project witch is the modified Rev E witch includes the over-the-PCB soldered wires
- notice some components have two values like R28, R40 and R41 equal 220/1K: first value 220 is for Rev B and second value 1K is for Rev E
- where a "-" is encountered, it means that the component is missing on Rev E but the footprint is available
- for the power connector I added side by side with the original connector's footprint, a 6-pin DIN connector
IMPORTANT: In the original project a few mistakes slipped in.
- I did not notice a cut on the original PCB witch led to joining of two tracks. This section is documented on the Romanian Home Computer group by Radioman V: https://groups.google.com/g/romanianhomecomputer/c/qHbKBThCIQc/m/c_SBp--mCgAJ
- Two circuits retained the old names from the original converted project

Parts
259| Qty | Value | Footprint | References |
|---|---|---|---|
| 25 | u1 | HC2000:C025-024X044 | CD1, CD11, CD13, CD15, CD16, CD17, CD19, CD20, CD21, CD22, CD24, CD25, CD26, CD27, CD30, CD31 +9 |
| 24 | 1k | HC2000:0204_7 | R1, R2, R3, R4, R13, R14, R34, R37, R38, R44, R47, R49, R51, R53, R55, R58 +8 |
| 11 | 10k | HC2000:0204_7 | R7, R8, R9, R11, R15, R16, R18, R20, R25A0, R29, R52 |
| 10 | - | HC2000:C025-024X044 | CD2, CD4, CD7, CD8, CD10, CD14, CD28, CD29, CD34, CD38 |
| 8 | 1N4148 | HC2000:DO35-10 | D1, D2, D3, D4, D5, D6, D7, D8 |
| 8 | 74LS74 | HC2000:DIL14 | UB1, UD3, UD10, UE10, UF4, UF10, UG12, UH12 |
| 6 | 100u | HC2000:C025-024X044 | CD3, CD5, CD12, CD18, CD23, CX0 |
| 6 | 74LS161 | HC2000:DIL16 | UD12, UE5, UF2, UF5, UG5, UH7 |
| 5 | 470 | HC2000:0204_7 | R19, R19B0, R33, R43, R50A0 |
| 5 | 74LS08 | HC2000:DIL14 | UD1, UE2, UG10, UG11, UH5 |
| 5 | 74LS138 | HC2000:DIL16 | UA9, UB10, UE4, UF8, UH10 |
| 5 | 74LS257 | HC2000:DIL16 | UC4, UC5, UD5, UG7, UH6 |
| 5 | 74LS32 | HC2000:DIL14 | UC3, UE3, UF9, UG9, UH8 |
| 4 | 220/1k | HC2000:0204_7 | R28, R40, R41, R56 |
| 4 | 4n7 | HC2000:C025-025X050 | C12, C13, C16, C17 |
| 4 | 74LS04 | HC2000:DIL14 | UC1, UE11, UG0, UG4 |
| 4 | 74LS175 | HC2000:DIL16 | UC12, UF3, UG3, UH1 |
| 3 | 330/- | HC2000:0204_7 | R26, R42, R45 |
| 3 | 560 | HC2000:0204_7 | R39, R46, R57 |
| 3 | 74LS374 | HC2000:DIL20 | UD6, UF6, UG6 |
| 3 | CLOSED with 1 EPROM | HC2000:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JX2, JX3, JX4 |
| 2 | - | HC2000:JP1 | JP2, JP5 |
| 2 | . | HC2000:HC-POWER | J4, J6 |
| 2 | 100n | HC2000:C025-030X050 | C1, C3 |
| 2 | 270p | HC2000:C025-025X050 | C10, C11 |
| 2 | 2k | HC2000:0204_7 | R12, R17 |
| 2 | 2k x 4bit CMOS RAM/- | HC2000:DIL18 | UA8, UC8 |
| 2 | 330/300 | HC2000:0204_7 | R5, R60 |
| 2 | 3k9 | HC2000:0204_7 | R54, R61 |
| 2 | 510 | HC2000:0204_7 | R65, R71 |
| 2 | 74LS00 | HC2000:DIL14 | UB2, UH3 |
| 2 | 74LS09 | HC2000:DIL14 | UA23, UA34 |
| 2 | 74LS174 | HC2000:DIL16 | UB9, UF7 |
| 2 | 74LS244 | HC2000:DIL20 | UA1, UC7 |
| 2 | 75/69 | HC2000:0204_7 | R30, R48 |
| 2 | 910 | HC2000:0204_7 | R62, R67 |
| 2 | BC177 | HC2000:TO18 | T4, T5 |
| 2 | FDD-CON | HC2000:2X17 | J7, J8 |
| 2 | TMM41464AP-12 | HC2000:DIL18 | UD7, UE7 |
| 1 | . | HC2000:10X04MTA | J9 |
| 1 | 10-60pF | HC2000:CTRIM808-BC | CT0 |
| 1 | 100 | HC2000:0204_7 | R36 |
| 1 | 100 | HC2000:PIS2816 | L1 |
| 1 | 100p/180p | HC2000:C025-030X050 | C14 |
| 1 | 10k | HC2000:SIL9 | RP1 |
| 1 | 10k/470k | HC2000:0204_7 | R21 |
| 1 | 10p/15p | HC2000:C025-030X050 | C7 |
| 1 | 10u | HC2000:C025-024X024 | C15 |
| 1 | 1488 | HC2000:DIL14 | UA10 |
| 1 | 1489 | HC2000:DIL14 | UF12 |
| 1 | 150p | HC2000:C025-030X050 | C6 |
| 1 | 17,734 | HC2000:HC18U-H | Q1 |
| 1 | 1N4148 | HC2000:DO35-7 | DX1 |
| 1 | 1k1 | HC2000:0204_7 | R70 |
| 1 | 1k5 | HC2000:0204_7 | R32 |
| 1 | 1k8/1k6 | HC2000:0204_7 | R66 |
| 1 | 220 | HC2000:0204_7 | R23 |
| 1 | 220p | HC2000:C025-030X050 | C9 |
| 1 | 220p/- | HC2000:C025-030X050 | C8 |
| 1 | 240/270 | HC2000:0204_7 | R31 |
| 1 | 270p | HC2000:C025-030X050 | C5 |
| 1 | 27128P/- | HC2000:DIL28-6 | UE8A0 |
| 1 | 27C256/27C512 | HC2000:DIL28 | UB6 |
| 1 | 27k | HC2000:0204_7 | R59 |
| 1 | 2M2/2M | HC2000:0204_7 | R6 |
| 1 | 2N2369/2N2368 | HC2000:TO18 | T2 |
| 1 | 2N2369/BC108A | HC2000:TO18 | T3 |
| 1 | 2k7 | HC2000:0204_7 | R69 |
| 1 | 3,3uF/4,7uF | HC2000:C025-024X044 | C4 |
| 1 | 430 | HC2000:0204_7 | R24 |
| 1 | 47 | HC2000:0204_7 | R27A0 |
| 1 | 47k | HC2000:0204_7 | R10 |
| 1 | 4n7 | HC2000:C025-030X050 | C2 |
| 1 | 5k6/5k1 | HC2000:0204_7 | R68 |
| 1 | 680 | HC2000:0204_7 | R35 |
| 1 | 74LS05 | HC2000:DIL14 | UG8 |
| 1 | 74LS06 | HC2000:DIL14 | UA11 |
| 1 | 74LS125 | HC2000:DIL14 | UC9 |
| 1 | 74LS14 | HC2000:DIL14 | UD11 |
| 1 | 74LS153 | HC2000:DIL16 | UB12 |
The 228 most common of 259 parts.
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Questions
How big is the HC2000 PCB?
It measures 478 × 183 mm and has 2 copper layers, 1.6 mm thick.
What parts does the HC2000 use?
259 parts, built around the 74LS125DC, 74LS74PC, 74LS161DC and 74LS257PC. 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 HC2000 KiCad files?
From the badrianiulian/HC2000 repository on GitHub, at the commit this page was made from: the board is HC2000.kicad_pcb and its schematic HC2000.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the HC2000 design in my own project?
Its repository states no licence, so its author keeps all rights: ask badrianiulian before reusing the design.