2 layers234 × 100 mm
V2b
KITTY-6502/hardware
the KITTY is a 65c02 homebrew kit microcomputer designed around text mode graphics and cartridge media. It is fully open source, and uses exclusively in-production parts.
147 parts
2 layers58.4 × 40 mm
the KITTY is a 65c02 homebrew kit microcomputer designed around text mode graphics and cartridge media. It is fully open source, and uses exclusively in-production parts.
- Size
- 58.4 × 40 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 4
- Nets
- 43
- Pads
- 83
- Tracks, vias
- 236, 56
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 12 Jan 2024
- Updated
- 18 Jan 2025
Overview
V2a is an open-source printed circuit board by KITTY-6502, from the KITTY-6502/hardware repository on GitHub. It is a 2-layer board of 58.4 × 40 mm with 4 parts on 43 nets, routed with 236 tracks and 56 vias.
It is built around the 74AHCT1G32GV and AS6C4008-55PCN. Its parts include 2 ICs, 1 capacitor and 1 connector.
Main components
2
74AHCT1G32GV
SOT-23-5L-40℃~+125℃ 1 2 2V 3.7V 4.5V~5.5V 40uA 550mV 74AHCT1G32 8.5ns@5.5V,15pF 800mV OR Gate Overvoltage-tolerant input TTL compatible CMOS SOT-23-5L Logic Gates ROHSMDDLogic Gates
AS6C4008-55PCN
PDIP-320℃~+70℃ 2.7V~5.5V 30mA 4Mbit 4uA 55ns Parallel Port (Parallel) PDIP-32 SRAM ROHSAlliance MemorySRAM
README
README.mdKITTY Computer
the KITTY is a 65c02 homebrew kit microcomputer designed around text mode graphics and cartridge media. It is fully open source, and uses exclusively in-production parts.
Quick Specs:
- Bus Speed: 3Mhz
- CPU:* w65c02s @~2.2Mhz (average)
- RAM: 28Kb SRAM
- Video: Custom, 256x256pixels, a text mode display using a preset font, 32x32 8x8 pixel characters, 16 color palette
- Sound: Custom, 8x1 Wavetable Audio, 3 melodic + 1 percussive channels, all with 4bit+4bit stereo volume control.
- Input: 40-Key Mechanical Keyboard
- Media/Expansion: 2 Cartridge Slots, each with up to 128x32Kb banks.
- Interrupts: /IRQ triggered when the video circuit has drawn the last visible pixels on the frame.
- Output: RGB PAL (50hz), via a SCART connector.
Parts
4| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | 74AHCT1G32 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | AS6C4008-55PCN | Package_DIP:DIP-32_W15.24mm_Socket_LongPads | U1 |
| 1 | Conn_02x22_Odd_Even | Smal:KITTY_Cart_Edge | J1 |
Questions
How big is the V2a PCB?
It measures 58.4 × 40 mm and has 2 copper layers, 1.6 mm thick.
What parts does the V2a use?
4 parts, built around the 74AHCT1G32GV and AS6C4008-55PCN. 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 V2a KiCad files?
From the KITTY-6502/hardware repository on GitHub, at the commit this page was made from: the board is Kicad/ramcart/v2a/v2a.kicad_pcb and its schematic Kicad/case/back/back.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the V2a design in my own project?
Its repository states no licence, so its author keeps all rights: ask KITTY-6502 before reusing the design.
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