2 layers
6502fastbb
gfoot/fastpdip6502
Fast PDIP-only 6502-based homebrew computer - code and hardware design sources
30 parts7Unlicense
2 layers99.7 × 80 mm
6502fast3io
gfoot/fastpdip65027Fast PDIP-only 6502-based homebrew computer - code and hardware design sources
- Size
- 99.7 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 56
- Nets
- 94
- Pads
- 406
- Tracks, vias
- 1,338, 140
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 17 Oct 2023
- Updated
- 17 Oct 2023
Overview
6502fast3io is an open-source printed circuit board by gfoot, from the gfoot/fastpdip6502 repository on GitHub, published under the Unlicense licence. It is a 2-layer board of 99.7 × 80 mm with 56 parts on 94 nets, routed with 1,338 tracks and 140 vias.
It is built around the 74AHCT245D, 74AHCT74D and 74HC14, with the 74HCT138D, 74HCT273D and IRF9540NS among its other parts. Its parts include 18 capacitors, 7 resistors, 7 ICs, 5 diodes and 5 connectors. It belongs with the retro computing and games boards of this library.
Main components
6
74AHCT245D
SOIC-20-300mil-40℃~+125℃ 1 11ns@5.5V,50pF 4.5V~5.5V 74AHCT 8 80uA 8mA 8mA Bidirectional TTL-compatible CMOS Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74AHCT74D
SOIC-14-40℃~+125℃ 0ns 1 140MHz 2 2uA 3pF 4.5V~5.5V 5ns 74AHCT Series 8.8ns@5V,50pF 8mA 8mA Asynchronous Complementary D-Type Rising Edge Set and Reset SOIC-14 Flip Flops ROHSNexperiaFlip Flops74HC14
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 ROHSJSMSEMIInverters
74HCT138D
SO-16-40℃~+125℃ 160uA 20ns@4.5V,50pF 3/8 4.5V~5.5V 4mA 4mA 74HCT Decoder Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74HCT273D
SOIC-20-300mil-40℃~+125℃ 12ns 3.5pF 30ns@4.5V,50pF 36MHz 3ns 4.5V~5.5V 4mA 5.2mA 74HCT Series 8 8uA D-Type Reset Rising Edge SOIC-20-300mil Flip Flops ROHSNexperiaFlip Flops
IRF9540NS
TO-263MOSFETsMinos
README
README.mdFast PDIP 6502 project sources
This is my attempt at making a fast 6502-based computer, overclocking the CPU to 32MHz and beyond, while retaining a 70s/80s-style parallel architecture, with ISA-style expansion slots, using only PDIP and through-hole components.
See https://hackaday.io/project/192630-fast-pdip-6502-computer for more details including photos, schematics, and a more complete description of the development and theory of the project.
This repository contains:
- hardware/breadboard - schematics and "PCB" layout files for the breadboard prototype
- hardware/pcb - schematics, PCB layouts, gerbers, etc for the all the PCBs
- pld - various PLD module code required by different versions
- server - Python serial server code
- src - 6502 assembler code
- utils - other utility scripts
See also other READMEs:
Building
The hardware files need to be loaded into KiCad 7.0 for editing, exporting gerbers, etc.
The gerber zips can be sent straight to a PCB manufacturer if you just want the same PCBs that I am using.
The PLD files are built using WinCupl. I do this from the command line but you can also do it in the GUI if you prefer.
The 6502 assembler source is built using xa, which is easy to install under Ubuntu at least. One build step requires use of Python to create a #include file - I use Python 3 for this. There's a Makefile in the "src" directory.
The serial server program is also written in Python, for Python 3.
All of this is run on Ubuntu Linux but you should be able to port it to other systems.
Parts
56| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | .1u | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C3, C9, C14, C15, C16, C17, C18, C19, C20, C21, C22, C24, C25, C27 |
| 4 | 22k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1, R2, R4, R6 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_Pad | H1, H2, H3, H4 |
| 3 | 1N5817 | Diode_THT:D_DO-34_SOD68_P7.62mm_Horizontal | D2, D3, D4 |
| 3 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H4.3mm | SW1, SW2, SW3 |
| 3 | conn_pcb_edge_33pin_sense | 6502fast2:6502fast2_IO_PCBEdgeSocket | J7, J8, J9 |
| 2 | 47 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R5, R7 |
| 1 | 100u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C11 |
| 1 | 10k | Resistor_THT:R_Array_SIP9 | RN2 |
| 1 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C10 |
| 1 | 1N4001 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 1N4148 | Diode_THT:D_DO-34_SOD68_P10.16mm_Horizontal | D5 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R3 |
| 1 | 28C256 | Package_DIP:DIP-28_W15.24mm_Socket | U9 |
| 1 | 2N7000 | Package_TO_SOT_THT:TO-92_Inline | Q2 |
| 1 | 3k3 | Package_DIP:DIP-16_W7.62mm | RN1 |
| 1 | 4MHz | Oscillator:Oscillator_DIP-8 | X2 |
| 1 | 74AHCT245 | Package_DIP:DIP-20_W7.62mm | U13 |
| 1 | 74AHCT74 | Package_DIP:DIP-14_W7.62mm | U16 |
| 1 | 74HC14 | Package_DIP:DIP-14_W7.62mm | U15 |
| 1 | 74HCT138 | Package_DIP:DIP-16_W7.62mm | U12 |
| 1 | 74HCT273 | Package_DIP:DIP-20_W7.62mm | U14 |
| 1 | Barrel_Jack | Connector_BarrelJack:BarrelJack_Horizontal | J1 |
| 1 | Conn_02x18_Odd_Even | PCB_Edge_Connectors:PCB_Edge_Socket_36pin | J10 |
| 1 | Fuse | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | F1 |
| 1 | HDSP-4850_2 | Display:HDSP-4850 | BAR1 |
| 1 | I/O PLD | Package_DIP:DIP-20_W7.62mm_Socket | U3 |
| 1 | IRF9540N | 6502fast2:TO-220-3_Horizontal_TabDown_NoHole | Q1 |
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Questions
How big is the 6502fast3io PCB?
It measures 99.7 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 6502fast3io use?
56 parts, built around the 74AHCT245D, 74AHCT74D, 74HC14 and 74HCT138D. 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 6502fast3io KiCad files?
From the gfoot/fastpdip6502 repository on GitHub, at the commit this page was made from: the board is hardware/pcb/6502fast3io/6502fast3io.kicad_pcb and its schematic hardware/breadboard/6502fastbb/6502fastbb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 6502fast3io design in my own project?
Its repository publishes it under the Unlicense licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).