2 layers234 × 100 mm
V1c
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.
145 parts
2 layers234 × 100 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
- 234 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 147
- Nets
- 241
- Pads
- 1,008
- Tracks, vias
- 4,139, 509
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 12 Jan 2024
- Updated
- 18 Jan 2025
Overview
V2b 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 234 × 100 mm with 147 parts on 241 nets, routed with 4,139 tracks and 509 vias.
It is built around the 74HCT540D, 74HC165D and 74HC574D, with the 74HC590D, 74HC138 and 74HC670P-E among its other parts. Its parts include 44 resistors, 39 capacitors, 32 ICs, 9 connectors and 6 diodes.
Main components
12
74HCT540D
SO-20-300mil-40℃~+125℃ 1 13ns@4.5V,50pF 160uA 4.5V~5.5V 6mA 6mA 74HCT 8 Tri-State Unidirectional SO-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffer/Driver/Transceiver
74HC165D
SO-16-40℃~+125℃ 1 28ns@6V,50pF 2V~6V 35MHz 500mW 74HC 8 Parallel or Serial to Serial SOIC-16 Shift Registers ROHSNexperiaShift Registers74HC574D
SOP-20L-40℃~+125℃ 1 13ns 15ns@6V,50pF 2.7V~6V 20uA 28MHz 5ns 6.5pF 7.8mA 7.8mA 74HC Series 8 D-Type Enable Rising Edge Tri-State SOP-20L Flip Flops ROHSMDDFlip Flops74HC590D
SO-16-40℃~+125℃ 1 15ns 2V~6V 61MHz 8 Asynchronous Divide-by-2 Rising Edge Up Counter SO-16 Counters, Dividers ROHSNexperiaCounters, Dividers
74HC138
SOP-160℃~+70℃ 24ns@5.0V,16pF 2V~6V 3/8 5.2mA 5.2mA 5uA 74HC Decoder Reverse function Single Supply SOP-16 Signal Switches, Multiplexers, Decoders ROHSGRSignal Switches, Multiplexers, Decoders
74HC670P-E
DIP-16-40℃~+125℃ 16 21ns@4.5V,50pF 2V~6V 35mA 35mA 74HC Output enable Tri-State DIP-16 Shift Registers ROHSRenesas ElectronicsShift Registers
74HC00D
SOP-14-40℃~+125℃ 1.5V、3.15V、4.2V 1.9V、3.7V、5.9V 100mV、400mV、400mV 2 2V~6V 4 40uA 5.2mA 5.2mA 500mV~1.8V 74HC Series 7ns@6V,50pF NAND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates74HC139D
SO-16-40℃~+125℃ 11ns@6.0V,50pF 160uA 2/4 2V~6V 74HC Decoder Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74HC14
SOP-14-40℃~+85℃ 1.9V、3.98V、4.4V、5.48V、5.9V 100mV、260mV、260mV 20uA 25ns@4.5V,50pF 2V~6V 6 74HC Noise suppression function Schmitt trigger SOP-14 Inverters ROHSJSMSEMIInverters74HC153D
SOIC-16-40℃~+125℃ 160uA 2V~6V 44ns@4.5V,50pF 5.2mA 5.2mA 74HC 8/2 Multiplexer Output enable high-impedance Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches, Multiplexers, Decoders74HC157D
SO-16-40℃~+125℃ 10ns@6.0V,50pF 160uA 2V~6V 5.2mA 5.2mA 74HC 8/4 Multiplexer Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74HC273D
SOIC-20-300mil-40℃~+125℃ 1 12ns 15ns@4.5V,50pF 2V~6V 3.5pF 30MHz 3ns 74HC Series 8 8uA D-Type Reset Rising Edge SO-20-300mil Flip Flops ROHSNexperiaFlip Flops
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
147| Qty | Value | Footprint | References |
|---|---|---|---|
| 33 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C4, C5, Cd1, Cd2, Cd10, Cd11, Cd12, Cd13, Cd14, Cd15, Cd16, Cd17, Cd18, Cd19, Cd20, Cd22 +17 |
| 10 | 20KΩ | SMAL:RESISTOR VERT_WIDE | R19, R20, R21, R22, R23, R28, R29, R30, R31, R32 |
| 7 | 1.5kΩ | SMAL:R_Horizontal | R2, R8, R9, R10, R11, R12, R13 |
| 6 | 10KΩ | SMAL:RESISTOR VERT_WIDE | R24, R25, R26, R33, R34, R35 |
| 6 | 3.3kΩ | SMAL:R_Horizontal | R1, R3, R37, R42, R43, R44 |
| 5 | 1N4148 | Diode_THT:D_DO-34_SOD68_P7.62mm_Horizontal | D1, D2, D4, D5, D6 |
| 5 | 74HC165 | Smal:DIP-16_W7.62mm_Socket_LongPads_TWEAK | U13, U22, U23, U24, U25 |
| 4 | 74HC574 | Smal:DIP-20_W7.62mm_Socket_LongPads_TWEAK | U6, U9, U12, U15 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_ISO14580_Pad | H1, H2, H3, H4 |
| 4 | TestPoint | TestPoint:TestPoint_Pad_2.0x2.0mm | TP1, TP2, TP3, TP4 |
| 3 | 10µF | SMAL:CP_Radial_D6.3mm_P3.8mm | C6, C7, C8 |
| 3 | 74HC590 | Smal:DIP-16_W7.62mm_Socket_LongPads_TWEAK | U3, U10, U11 |
| 3 | SST39SF | Smal:PLCC-32_THT-Socket_TWEAK | U5, U8, U29 |
| 2 | 1.2KΩ | SMAL:R_Horizontal | R14, R16 |
| 2 | 27KΩ | SMAL:R_Horizontal | R4, R5 |
| 2 | 3.3kΩ | Resistor_THT:R_Array_SIP9 | RN1, RN2 |
| 2 | 74HC138 | Smal:DIP-16_W7.62mm_Socket_LongPads_TWEAK | U7, U30 |
| 2 | 74HC670 | Smal:DIP-16_W7.62mm_Socket_LongPads_TWEAK | U18, U19 |
| 2 | 75Ω | SMAL:RESISTOR VERT_WIDE | R27, R36 |
| 2 | 75Ω | SMAL:R_Horizontal | R38, R40 |
| 2 | 820Ω | SMAL:R_Horizontal | R15, R17 |
| 2 | Conn_02x22_Odd_Even | Smal:EdgeHeader_2x22_P2.54mm_Vertical | J5, J6 |
| 2 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H5, H6 |
| 1 | 1.2kΩ | SMAL:R_Horizontal | R39 |
| 1 | 1MΩ | SMAL:R_Horizontal | R7 |
| 1 | 22pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C2 |
| 1 | 27pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C3 |
| 1 | 330Ω | SMAL:R_Horizontal | R41 |
| 1 | 4.7µF | Capacitor_THT:CP_Radial_D4.0mm_P1.50mm | C1 |
| 1 | 470Ω | SMAL:R_Horizontal | R18 |
| 1 | 5.6KΩ | SMAL:R_Horizontal | R6 |
| 1 | 62256 | Smal:DIP-28_W15.24mm_Socket_LongPads_TWEAK | U28 |
| 1 | 65c02 | Smal:PLCC-44_THT-Socket_TWEAK | U1 |
| 1 | 74HC00 | Smal:DIP-14_W7.62mm_Socket_LongPads_TWEAK | U26 |
| 1 | 74HC139 | Smal:DIP-16_W7.62mm_Socket_LongPads_TWEAK | U16 |
| 1 | 74HC14 | Smal:DIP-14_W7.62mm_Socket_LongPads_TWEAK | U2 |
| 1 | 74HC153 | Smal:DIP-16_W7.62mm_Socket_LongPads_TWEAK | U17 |
| 1 | 74HC157 | Smal:DIP-16_W7.62mm_Socket_LongPads_TWEAK | U14 |
| 1 | 74HC273 | Smal:DIP-20_W7.62mm_Socket_LongPads_TWEAK | U32 |
| 1 | 74HC4040 | Smal:DIP-16_W7.62mm_Socket_LongPads_TWEAK | U4 |
| 1 | 74HC85 | Smal:DIP-16_W7.62mm_Socket_LongPads_TWEAK | U27 |
| 1 | 74HCT540 | Smal:DIP-20_W7.62mm_Socket_LongPads_TWEAK | U31 |
| 1 | 82C54 | Smal:DIP-24_W15.24mm_Socket_TWEAK | U20 |
| 1 | 82C54 (PLCC) | Smal:PLCC-28_THT-Socket_TWEAK | U21 |
| 1 | Barrel_Jack_MountingPin | Connector_BarrelJack:BarrelJack_Horizontal | J3 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J9 |
| 1 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
| 1 | DE15_Plug_HighDensity_MountingHoles | Connector_Dsub:DSUB-15-HD_Female_Horizontal_P2.29x1.98mm_EdgePinOffset8.35mm_Housed_MountingHolesOffset10.89mm | J7 |
| 1 | KeyOUT | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J2 |
| 1 | Logo_Open_Hardware_Small | Symbol:OSHW-Logo_7.5x8mm_SilkScreen | SY1 |
| 1 | MCLK | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | PJ-325 | Smal:Jack_3.5mm_PJ-325 | J8 |
| 1 | Power LED | LED_THT:LED_Rectangular_W5.0mm_H2.0mm | D3 |
| 1 | RESET Switch | Button_Switch_THT:SW_Tactile_SPST_Angled_PTS645Vx83-2LFS | SW1 |
| 1 | SCART-F | Video:SCART | J4 |
| 1 | SS-12D11-G5 | Button_Switch_THT:SW_Slide_1P2T_CK_OS102011MS2Q | SW2 |
The 146 most common of 147 parts.
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Questions
How big is the V2b PCB?
It measures 234 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the V2b use?
147 parts, built around the 74HCT540D, 74HC165D, 74HC574D and 74HC590D. 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 V2b KiCad files?
From the KITTY-6502/hardware repository on GitHub, at the commit this page was made from: the board is Kicad/mainboard/v2b/v2b.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 V2b design in my own project?
Its repository states no licence, so its author keeps all rights: ask KITTY-6502 before reusing the design.