2 layers190.5 × 105 mm
2 layers105.4 × 30 mm
Panel
atarola/compy6502Code for my 6502 build
- Size
- 105.4 × 30 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 14
- Pads
- 60
- Tracks, vias
- 82, 10
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 24 Nov 2019
- Updated
- 19 Jul 2026
Overview
Panel is an open-source printed circuit board by atarola, from the atarola/compy6502 repository on GitHub. It is a 2-layer board of 105.4 × 30 mm with 15 parts on 14 nets, routed with 82 tracks and 10 vias.
It is built around the SN74HC393N. Its parts include 3 capacitors, 2 ICs, 2 connectors, 1 switch and 1 crystal. It belongs with the retro computing and games boards of this library.
Main components
1README
README.mdcompy6502
compy6502 is an early-stage 6502 homebrew computer project. The long-term
goal is to build enough hardware and firmware to run Tetris on the machine.
The design follows the spirit of Ben Eater-style breadboard/modular 6502
systems for simplicity and debuggability, but uses a different memory map based
on the MMU/address-decoder architecture in docs/mmu.png.
The repo currently includes KiCad hardware designs, early ROM bring-up
firmware, build/write scripts, emulator test scaffolding, and architecture
reference images in docs/.
Memory Map
The intended memory map is:
$0000-$BFFF RAM
$C000-$C0FF I/O page
$C100-$FFFF ROMThe I/O page is split into four 64-byte device slots:
$C000-$C03F IO0B
$C040-$C07F IO1B
$C080-$C0BF IO2B
$C0C0-$C0FF IO3BThe linker script currently uses $8000-$FFFF as the 32 KB EEPROM image range
so CPU addresses map directly to the correct physical offsets on the chip.
ROM Layout
The intended ROM organization is:
$C100-$C1FF public jump table
$C200-$DFFF kernel routines and drivers
$E000-$EFFF enhanced monitor
$F500-$FFF9 Wozmon fallback monitor
$FFFA-$FFFF CPU vectorsCredits
docs/mmu.png: Mike McLaren, K8LH.docs/Beater 02b.png: Mike McLaren, K8LH.
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_Pad | H3, H4, H5, H7, H8 |
| 3 | 0.1u | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C6, C7, C8 |
| 1 | 16 mhz | Oscillator:Oscillator_DIP-8 | Y1 |
| 1 | Conn_02x04_Counter_Clockwise | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical | J8 |
| 1 | DS1813-19 | Package_TO_SOT_THT:TO-92_Inline | U1 |
| 1 | Reset Button | Button_Switch_THT:SW_SPST_Omron_B3F-40xx | SW1 |
| 1 | SN74HC393N | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U2 |
| 1 | Speed Selector | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Vertical | J2 |
| 1 | XTAL enable | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1 |
Questions
How big is the Panel PCB?
It measures 105.4 × 30 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Panel use?
15 parts, built around the SN74HC393N. 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 Panel KiCad files?
From the atarola/compy6502 repository on GitHub, at the commit this page was made from: the board is kicad/panel/panel.kicad_pcb and its schematic kicad/ACIA/ACIA.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Panel design in my own project?
Its repository states no licence, so its author keeps all rights: ask atarola before reusing the design.
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