2 layers100 × 100 mm Board6502, the printed circuit board in 3D

Board6502

homebrew 65c02 single board computer

Size: 100 × 100 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 52
Nets: 88
Pads: 351
Tracks, vias: 1,372, 133
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 28 Sep 2021
Updated: 7 Jun 2022

Overview

Board6502 is an open-source printed circuit board by ulmer-a, from the ulmer-a/6502_board repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 100 × 100 mm with 52 parts on 88 nets, routed with 1,372 tracks and 133 vias.

It is built around the 74LS00SC, 74LS04PC and 74LS30PC, with the DS1813-5+ among its other parts. Its parts include 12 capacitors, 10 resistors, 9 ICs, 5 diodes and 5 connectors. It belongs with the computers and single-board computers and retro computing and games boards of this library.

Main components

README

README.md

Homebrew 6502 single board computer (running MS BASIC)

This repo contains kicad schematics, netlist, layout and gerber plots for the pcb, as well as a parts list, the firmware and a port of Microsoft BASIC. The board is fully functional and all parts (or equivalent alternatives) are readily available as of Nov '21.

You are welcome to use everything contained in this repository under the terms of the GNU General Public License v3.0, except for MS BASIC, which is made available under a BSD 2-clause license.

PCB Rendering

Specifications

65c02 8-bit CPU along with 32KB RAM and 8K ROM
65c22 VIA provides some GPIO pins and timers
65c51 ACIA provides a serial port with up to 115200 baud
4 status led's (3 of them are freely programmable)
18 pin I/O pinheader with general purpose I/O pins (VIA)
34 pin expansion pinheader exposing full address and data bus as well as other interesting lines (SYNC, CLK and HALT)

Firmware

The firmware initializes the system and provides drivers for the GPIOs, timers and the UART. It also provides routines to support the execution of MS BASIC.

Memory map and I/O addresses

plaintext

+-----------------------+   <- 0x0000     --.
|       zeropage        |                   |
+-----------------------+   <- 0x0100       |
|        stack          |                   |
+-----------------------+   <- 0x0200       |
|      available        |                   |
|         RAM           |                    > 32k RAM
|         ...           |                   |
+-----------------------+   <- 0x7e00       |
|     UART RX buffer    |                   |
+-----------------------+   <- 0x7f00       |
|     UART TX buffer    |                   |
+-----------------------+   <- 0x8000     --'
|                       |
|      unallocated      |         reserved for expansion shields etc.
|                       |
+-----------------------+   <- 0xdfe0     --.
|      65C51 UART       |                   |
+-----------------------+   <- 0xdff0        > memory mapped I/O
|      65C22 VIA        |                   |
+-----------------------+   <- 0xe000     --:
|     firmware code     |                   |
|    firmware rodata    |                   |
|       MS BASIC        |                    > 8k ROM

Category and platform

Computers and single-board computers Retro computing and games

Topics

hardware 6502 65c02 homebrew firmware

Project files

Show this board on your page

https://pcbkit.io/boards/ulmer-a/6502_board

The board's own page, for a message or a post.

Source

Repository: ulmer-a/6502_board
Board file: board6502/board6502.kicad_pcb
Commit: 1869623
Licence: GPL-3.0

Parts

Qty	Value	Footprint	References
8	100n	Capacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mm	C2, C3, C5, C6, C7, C8, C10, C11
4	330	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical	R1, R2, R3, R10
4	LED_Small	LED_SMD:LED_1210_3225Metric	D1, D2, D3, D5
4	MountingHole_3.2mm_M3	MountingHole:MountingHole_3.2mm_M3	M3, M3, M3, M3
4	pullup	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical	R4, R5, R6, R8
2	100µ	Capacitor_THT:CP_Radial_D6.3mm_P2.50mm	C4, C9
1	1-10MHz	Oscillator:Oscillator_DIP-14	X1
1	1.8432M	Crystal:Crystal_HC18-U_Vertical	Y1
1	1M	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical	R7
1	27p	Capacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mm	C1
1	74LS00	Package_DIP:DIP-14_W7.62mm_Socket	U2
1	74LS04	Package_DIP:DIP-14_W7.62mm_Socket	U3
1	74LS30	Package_DIP:DIP-14_W7.62mm_Socket	U5
1	AT28C64B	Socket:DIP_Socket-28_W11.9_W12.7_W15.24_W17.78_W18.5_3M_228-1277-00-0602J	U8
1	CLK disable	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	JP3
1	CY7C199	Package_DIP:DIP-28_W7.62mm_Socket	U9
1	DS1813	Package_TO_SOT_SMD:SOT-23	U1
1	Expansion Port	Connector_PinHeader_2.54mm:PinHeader_2x17_P2.54mm_Vertical	J4
1	IO Pinheader	Connector_PinHeader_2.54mm:PinHeader_2x09_P2.54mm_Vertical	J1
1	Power connector	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J5
1	RXCLK feed	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	JP2
1	Reset button	Button_Switch_THT:SW_Tactile_SKHH_Angled	SW1
1	SW Reset	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	JP1
1	SW_NMI	Button_Switch_THT:SW_Tactile_SKHH_Angled	SW2
1	UART	Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical	J2
1	USB_B	Connector_USB:USB_B_OST_USB-B1HSxx_Horizontal	J3
1	W65C02	Package_DIP:DIP-40_W15.24mm_Socket	U7
1	W65C22N	Package_DIP:DIP-40_W15.24mm_Socket	U4
1	W65C51N	Package_DIP:DIP-28_W15.24mm_Socket	U6
1	tbd	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical	R9
1	tbd	Capacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mm	C12
1	tbd	Diode_THT:D_DO-41_SOD81_P2.54mm_Vertical_AnodeUp	D4

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Questions

How big is the Board6502 PCB?

It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Board6502 use?

52 parts, built around the 74LS00SC, 74LS04PC, 74LS30PC and DS1813-5+. 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 Board6502 KiCad files?

From the ulmer-a/6502_board repository on GitHub, at the commit this page was made from: the board is board6502/board6502.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Board6502 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).