2 layers48.6 × 40.6 mm
Tape V2
liaminventions/XPL-32
All of the code and experiments for the XPL-32 Homebrew 6502 Laptop. Licensed under GNU GPL V3.
39 parts4GPL-3.0
2 layers323.8 × 91.1 mm
XPL-32-rounded
liaminventions/XPL-324All of the code and experiments for the XPL-32 Homebrew 6502 Laptop. Licensed under GNU GPL V3.
- Size
- 323.8 × 91.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 81
- Nets
- 119
- Pads
- 707
- Tracks, vias
- 3,516, 515
- Pours
- 1,847
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 24 Feb 2022
- Updated
- 22 Aug 2025
Overview
XPL-32-rounded is an open-source printed circuit board by liaminventions, from the liaminventions/XPL-32 repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 323.8 × 91.1 mm with 81 parts on 119 nets, routed with 3,516 tracks and 515 vias.
It is built around the 74HC00N and 74HC138N. Its parts include 22 capacitors, 16 resistors, 12 ICs, 3 connectors and 3 switches. It belongs with the retro computing and games and computers and single-board computers boards of this library.
Main components
2
74HC00N
DIP-14-40℃~+85℃ 0V~100mV、0V~100mV、0V~100mV、150mV~330mV、160mV~330mV 1.5V、3.15V、4.2V 1.9V~2V、3.84V~4.32V、4.4V~4.5V、5.34V~5.81V、5.9V~6V 2 20uA 2V~6V 4 500mV、1.35V、1.8V 74HC Series 9ns@4.5V,50pF NAND Gate DIP-14 Logic Gates ROHSHGSEMILogic Gates
74HC138N
DIP-16-40℃~+85℃ 160uA 25mA 2V~6V 3/8 35ns@6.0V,50pF 4mA 74HC Decoder Reverse function Single Supply DIP-16 Signal Switches, Multiplexers, Decoders ROHSHGSEMISignal Switches, Multiplexers, Decoders
README
README.mdXPL-32
The XPL-32 is a homebrew 8-bit 6502 laptop, with four 48-pin expansion slots, and a 22-pin I/O port.
XPL-32 stands for:
eXpandable Personal Laptop with 32k ram
Blog
Here I will post hardware updates to the XPL and more.
Also, be sure to check info.txt to know if there are any issues when i code.
Hardware Overview
CPU
A 6502, of course. A W65C02 to be exact.
I/O
For the I/O, I've got a W65C22 VIA. Port A, Port B and the handshake bits connect to the I/O slot. However CA2 is connected to the Video Switch Relay (VSR) W65C22 Datasheet
Video
The XPL-32 has an expandable monochrome terminal display that uses a 6551 ACIA at $8000 and two arduinos. This is the video and keyboard processer. (not made by me) The video can be switched to the composite input EXTVID (on the expansion port) by toggling the VSR. (a relay that switches beetween native video and EXTVID.)
So far, for Video expansions, I've made a TMS9918a one. (the same video processer used in the TI-99/4a and the MSX)
Sound
There is a 6581 SID at $B800 ($D400 in the c64) onboard with its potentiometer (POTX and POTY) and external sound (EXTSND) inputs on the expansion port. I programmed support to convert most SID files, as well.
Memory Map
Tools I Use
PCB Design
I currently use EAGLE
3D Modeling
Coding
VIM, NVIM/LunarVIM or vscode for code editing. xa, ca65 (from cc65), and vasm for assembly.
I have "xa 6502 cross assembler" syntax highlighting in vim, and the "vasm" extension in vscode.
most source files are .s, but some are .a65 or .asm
Debugging
I use Pulseview with this logic analyzer (the 2018 variant)
It was an absolute pain to set up...
Also, the SDcard-SPI decoder in libsigrokdecode was completly broken for me. (it always expected a CRC...) My fix was to make my own custom version of the decoder
The custom version is still slightly broken, but I am working on it.
I also use decode6502 by hoglet
Parts
81| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | 0.1uf | XPL-32:C025-025X050_334 | C1, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20 |
| 6 | 1k | XPL-32:0204_7_420 | R8, R9, R12, R16, R17, R18 |
| 4 | XPL-32:1X02_325 | JP2, JP4, JP9, UNK12V0 | |
| 4 | XPL-32:2X24_90_325 | JP11, JP12, JP13, JP14 | |
| 4 | 22pf | XPL-32:C025-025X050_334 | C5, C6, C7, C8 |
| 3 | XPL-32:1X03_420 | ATMEL/27128, RXT/RXVID0, TXT/TXKBD0 | |
| 3 | XPL-32:1X01_325 | -BAT0, +BAT0, UNK12 | |
| 2 | 10 | XPL-32:0204_7_420 | R1, R2 |
| 2 | 10K | XPL-32:0204_7_420 | R3, R4 |
| 2 | 10k | XPL-32:0204_7_420 | R13, R14 |
| 2 | 10uF | XPL-32:E2,5-7_420 | C3, C21 |
| 2 | 4.7K | XPL-32:0204_7_420 | R5, R6 |
| 2 | 470 | XPL-32:0204_7_420 | R7, R15 |
| 2 | 470pF | XPL-32:C150-054X183_420 | C4, C22 |
| 2 | OSC | XPL-32:OSCCAN | UNK1.8432MHZ0, UNK1MHZ0 |
| 1 | XPL-32:DIP-28 | U2 | |
| 1 | XPL-32:2X11_90_325 | JP1 | |
| 1 | XPL-32:DIL28-6_272 | IC6 | |
| 1 | XPL-32:1X04_NO_SILK_513 | J1 | |
| 1 | XPL-32:M_DIN6 | X1 | |
| 1 | XPL-32:2X06_325 | DEBUG0 | |
| 1 | XPL-32:DIP-40 | U4 | |
| 1 | 11.0592MHz | XPL-32:HC49U_511 | Y4 |
| 1 | 16MHz | XPL-32:HC49U_511 | Y3 |
| 1 | 1K | XPL-32:SIL9_347 | RN1 |
| 1 | 1UF | XPL-32:E2,5-7_420 | C2 |
| 1 | 328P | XPL-32:DIL28-3_105 | IC8 |
| 1 | 328P | XPL-32:DIP28_525 | U3 |
| 1 | 6581 | XPL-32:DIP-28 | U$2 |
| 1 | 74HC00N | XPL-32:DIL14_85 | IC4 |
| 1 | 74HC138N | XPL-32:DIL16_85 | IC7 |
| 1 | 74HCT166N | XPL-32:DIL16_88 | IC9 |
| 1 | 973 | XPL-32:973 | J3 |
| 1 | APF30205C | XPL-32:APF30212C_339 | K1 |
| 1 | AT28C256/27128 | XPL-32:DIP-28 | U7 |
| 1 | AUDIO_JACK_3.5MM_PTH | XPL-32:AUDIO-JACK_513 | J4 |
| 1 | FTDI | XPL-32:FTDI | U6 |
| 1 | MCP120-450DI_TO | XPL-32:TO127P254X495-3 | IC10 |
| 1 | MOMENTARY-SWITCH-SPST-PTH-6.0MM | XPL-32:TACTILE_SWITCH_PTH_6.0MM_535 | S6 |
| 1 | OKI-78SR-5_1.5-W36HE-C | XPL-32:OKI78SR515W36HEC | PS1 |
| 1 | TOGGLE_PUSHBUTTON | XPL-32:TOGGLE_BUTTON | U$1 |
| 1 | VIDEO | XPL-32:1X02_NO_SILK_513 | S3 |
| 1 | W65C02SP | XPL-32:DIP-40 | U1 |
More from liaminventions/XPL-32
4- 2 layers101.3 × 80 mm
XPL-32 - Copy - Copy
liaminventions/XPL-32
All of the code and experiments for the XPL-32 Homebrew 6502 Laptop. Licensed under GNU GPL V3.
23 parts4GPL-3.0 - 2 layers48.5 × 33 mm
Memory card
liaminventions/XPL-32
All of the code and experiments for the XPL-32 Homebrew 6502 Laptop. Licensed under GNU GPL V3.
11 parts4GPL-3.0 - 2 layers48.3 × 34.6 mm
Memory card
liaminventions/XPL-32
All of the code and experiments for the XPL-32 Homebrew 6502 Laptop. Licensed under GNU GPL V3.
3 parts4GPL-3.0
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Questions
How big is the XPL-32-rounded PCB?
It measures 323.8 × 91.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the XPL-32-rounded use?
81 parts, built around the 74HC00N and 74HC138N. 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 XPL-32-rounded KiCad files?
From the liaminventions/XPL-32 repository on GitHub, at the commit this page was made from: the board is PCB/kicad/xpl-32/XPL-32-rounded.kicad_pcb and its schematic PCB/kicad/sd/memory card.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the XPL-32-rounded design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).