Remake of 78up5 2650 PCG
18up5 is an open-source printed circuit board by postincrement, from the postincrement/18up5-2650-remake repository on GitHub. It is a 2-layer board of 208.9 × 81.9 mm with 106 parts on 75 nets, routed with 1,878 tracks and 65 vias.
It is built around the 74LS384N, 74LS123FP-E and L7805, with the AD14 and BC548 among its other parts. Its parts include 46 connectors, 19 resistors, 15 ICs, 11 capacitors and 5 diodes.
By Craig Southeren, craigs@postincrement.com
In May 1978, Electronics Australia described a small development board based on the Signetics 2650 microprocessor. For many people in Australia (the author included), this was the first computer that was cheap enough to buy and build even if you were a student or beginner.
This update to the simple and elegant design of the original provides a new PCB that evokes the original while adding modern alternatives to some of the hardto- get parts of the original.
This repo contains the full Kicad schematics and board layouts for this project
| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 0R | 2650:Link_7.62 | J4, J5, J6, J7, J8, J10, J12, J16, JP1, JP4, JP5, JP6 |
| 8 | 2114 | Housings_DIP:DIP-18_W7.62mm_Socket_LongPads | U6, U7, U8, U9, U10, U11, U12, U13 |
| 5 | 10k | Resistors_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R1, R12, R13, R14, R18 |
| 4 | 0.1uF | Capacitors_THT:C_Axial_L5.1mm_D3.1mm_P7.50mm_Horizontal | C3, C4, C5, C6 |
| 3 | 1K | Resistors_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R9, R15, R16 |
| 2 | 0R | Resistors_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | JP2, JP3 |
| 2 | 0R | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | J17, J18 |
| 2 | 10K | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4, R5 |
| 2 | 1N914 | Diodes_THT:D_A-405_P7.62mm_Horizontal | D3, D4 |
| 2 | 1U5 | Capacitors_THT:CP_Radial_Tantal_D5.0mm_P2.50mm | C9, C10 |
| 2 | 2k2 | Resistors_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R8, R17 |
| 2 | EM401 | Diodes_THT:D_A-405_P12.70mm_Horizontal | D1, D2 |
| 2 | H | Wire_Pads:SolderWirePad_single_0-8mmDrill | P6, P11 |
| 1 | +15V | Wire_Pads:SolderWirePad_single_0-8mmDrill | P4 |
| 1 | +5V | Connectors:Barrel_Jack_CUI_PJ-102AH | J11 |
| 1 | 0.1uF | Capacitors_THT:C_Axial_L5.1mm_D3.1mm_P10.00mm_Horizontal | C11 |
| 1 | 0.1uF | 2650:C_Axial_L3.8mm_D2.6mm_P25.00mm_Horizontal | C2 |
| 1 | 0V | Wire_Pads:SolderWirePad_single_0-8mmDrill | P22 |
| 1 | 10R | Resistors_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R10 |
| 1 | 10k | Potentiometers:Potentiometer_WirePads_largePads | RV1 |
| 1 | 150R | Resistors_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R19 |
| 1 | 150R | Resistors_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R3 |
| 1 | 1k | Resistors_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R2 |
| 1 | 20MA_IN | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | J15 |
| 1 | 20MA_OUT | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | J14 |
| 1 | 22k | Resistors_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R7 |
| 1 | 2500uF/16V | Capacitors_THT:CP_Radial_D18.0mm_P7.50mm | C1 |
| 1 | 2650 | Housings_DIP:DIP-40_W15.24mm_LongPads | U1 |
| 1 | 270p | Capacitors_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C7 |
| 1 | 27xxx | Housings_DIP:DIP-32_W15.24mm_Socket_LongPads | U15 |
| 1 | 3K3 | Resistors_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R11 |
| 1 | 47p | Capacitors_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C8 |
| 1 | 6k8 | Resistors_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R6 |
| 1 | 7.5V | Wire_Pads:SolderWirePad_single_0-8mmDrill | P25 |
| 1 | 74LS123 | Housings_DIP:DIP-16_W7.62mm_LongPads | U5 |
| 1 | 74LS138 | Housings_DIP:DIP-16_W7.62mm_LongPads | U3 |
| 1 | 74LS38 | Housings_DIP:DIP-14_W7.62mm_LongPads | U4 |
| 1 | A | Wire_Pads:SolderWirePad_single_0-8mmDrill | P3 |
| 1 | A-SENSE | Wire_Pads:SolderWirePad_single_0-8mmDrill | P1 |
| 1 | AD13 | Wire_Pads:SolderWirePad_single_0-8mmDrill | P10 |
| 1 | AD14 | Wire_Pads:SolderWirePad_single_0-8mmDrill | P9 |
| 1 | B | Wire_Pads:SolderWirePad_single_0-8mmDrill | P20 |
| 1 | B-CLOCK | Wire_Pads:SolderWirePad_single_0-8mmDrill | P21 |
| 1 | BC548 | TO_SOT_Packages_THT:TO-92_Molded_Wide | Q1 |
| 1 | C | Wire_Pads:SolderWirePad_single_0-8mmDrill | P12 |
| 1 | C-FLAG | Wire_Pads:SolderWirePad_single_0-8mmDrill | P7 |
| 1 | CONN_ADDR | Housings_DIP:DIP-10_W7.62mm | J9 |
| 1 | CONN_DATA | Pin_Headers:Pin_Header_Straight_1x08_Pitch2.54mm | P5 |
| 1 | D | Wire_Pads:SolderWirePad_single_0-8mmDrill | P19 |
| 1 | D-AD10 | Wire_Pads:SolderWirePad_single_0-8mmDrill | P18 |
| 1 | E | Wire_Pads:SolderWirePad_single_0-8mmDrill | P17 |
| 1 | E-AD11 | Wire_Pads:SolderWirePad_single_0-8mmDrill | P16 |
| 1 | F | Wire_Pads:SolderWirePad_single_0-8mmDrill | P15 |
| 1 | F-AD12 | Wire_Pads:SolderWirePad_single_0-8mmDrill | P14 |
| 1 | G | Wire_Pads:SolderWirePad_single_0-8mmDrill | P27 |
| 1 | G-W(P) | Wire_Pads:SolderWirePad_single_0-8mmDrill | P26 |
| 1 | L7805 | TO_SOT_Packages_THT:TO-220-3_Vertical | U14 |
| 1 | LED | LEDs:LED_D3.0mm | D5 |
| 1 | M/~IO | Wire_Pads:SolderWirePad_single_0-8mmDrill | P8 |
| 1 | OPREQ | Wire_Pads:SolderWirePad_single_0-8mmDrill | P13 |
| 1 | Oscillator | Housings_DIP:DIP-8_W7.62mm_LongPads | Y1 |
| 1 | PIPBUG | Housings_DIP:DIP-24_W15.24mm_LongPads | U2 |
| 1 | RESET | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | J13 |
| 1 | Reset | Buttons_Switches_THT:SW_PUSH_6mm | SW1 |
| 1 | TTL | Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm | J1 |
| 1 | WRP | Wire_Pads:SolderWirePad_single_0-8mmDrill | P24 |
| 1 | ~R/W | Wire_Pads:SolderWirePad_single_0-8mmDrill | P23 |
The 102 most common of 106 parts.
It measures 208.9 × 81.9 mm and has 2 copper layers, 1.6 mm thick.
106 parts, built around the 74LS384N, 74LS123FP-E, L7805 and AD14. 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.
From the postincrement/18up5-2650-remake repository on GitHub, at the commit this page was made from: the board is 18up5.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask postincrement before reusing the design.
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