AlphaPlus
About the AlphaPlus PCB
AlphaPlus is an open source PCB design by ARMCoderBR, published on GitHub under the GPL-2.0 license. It is a 2-layer board measuring 150.6 × 110.4 mm, with 78 components from 32 distinct parts.
Other key parts include the Z84C00xxP, KM28C64A, 74LS138, 4093 and 74LS273. By type, the board carries 21 resistors, 19 capacitors, 14 ICs, 10 diodes, 8 switches and 2 connectors.
It belongs with the retro computing and displays & leds designs in this gallery.
From the project
A Z80-based computer for nostalgic enthusiasts. With video output!
For starters, this is no more than a hobby project: a Z80-based computer. By no means it aims to be a practical solution to anything, as any modern microcontroller can do much better with lower cost, lower complexity, lower power consumption and much more ease of use. You can eventually make changes on it to perform some practical automation tasks and it WILL work, it's just not recommended nowadays. Get a PIC or Arduino instead.
Main components on the AlphaPlus
AlphaPlus bill of materials (BOM)
78 components, 32 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Z84C00xxP | DIP-40_W15.24mm_Socket | U1 |
| 1 | KM28C64A | DIP_Socket-28_W11.9_W12.7_W15.24_W17.78_W18.5_3M_228-1277-00-0602J | U2 |
| 2 | 74LS138 | DIP-16_W7.62mm_Socket | U3, U91 |
| 1 | 4093 | DIP-14_W7.62mm_Socket | U4 |
| 2 | 74LS273 | DIP-20_W7.62mm_Socket | U5, U11 |
| 1 | 74LS245 | DIP-20_W7.62mm_Socket | U6 |
| 1 | 74LS02 | DIP-14_W7.62mm_Socket | U7 |
| 2 | 74LS08 | DIP-14_W7.62mm_Socket | U8, U93 |
| 2 | HM62256BLP | DIP-28_W15.24mm_Socket | U9, U90 |
| 1 | 74HC04 | DIP-14_W7.62mm_Socket | U10 |
| 1 | 4MHz | Crystal_HC18-U_Vertical | X1 |
| 1 | +5VCC | Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | CN1 |
| 1 | 100k | Potentiometer_Bourns_3386F_Vertical | P1 |
| 1 | Jumper_2_Small_Bridged | PinHeader_1x02_P2.54mm_Vertical | JP4 |
| 1 | LCD16X2 | RC1602A | LCD1 |
| 1 | SW_Push | SW_PUSH_6mm_H9.5mm | RST1 |
| 8 | SW_Push | SW_PUSH_6mm_H9.5mm | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 |
| 1 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 9 | LED | LED_D3.0mm_FlatTop | D2, D3, D4, D5, D6, D7, D8, D9 +1 |
| 15 | 100nF | C_Disc_D3.8mm_W2.6mm_P2.50mm | C1, C2, C5, C7, C8, C9, C10, C11 +7 |
Show 12 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 33uF/16V | C_Radial_D4.0mm_H5.0mm_P1.50mm | C3 |
| 1 | 100uF/16V | C_Radial_D5.0mm_H7.0mm_P2.00mm | C6 |
| 1 | 10nF | C_Disc_D3.8mm_W2.6mm_P2.50mm | C13 |
| 1 | 47pF | C_Disc_D3.8mm_W2.6mm_P2.50mm | C14 |
| 6 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1, R2, R3, R4, R5, R6 |
| 1 | 1k5 | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R7 |
| 8 | 1k8 | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R8, R9, R10, R11, R12, R13, R14, R15 |
| 2 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R16, R17 |
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R18 |
| 1 | 5k6 | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R19 |
| 1 | 22 | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R20 |
| 1 | R_Network08 | R_Array_SIP9 | RN1 |
AlphaPlus design files
The KiCad project lives in the ARMCoderBR/z80computer-release repository on GitHub; these links point at the commit this page was built from.
AlphaPlus: common questions
How big is the AlphaPlus PCB?
The AlphaPlus measures 150.6 × 110.4 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the AlphaPlus?
78 components, from 32 distinct parts. The full bill of materials is listed on this page.
Where can I download the AlphaPlus design files?
From the ARMCoderBR/z80computer-release repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the AlphaPlus design in my own project?
Yes, under the terms of its GPL-2.0 license, which ARMCoderBR chose for the repository.
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