4 layers100 × 47.4 mm
4 layers100 × 100 mm
6502-retro
linuxplayground/6502-retroA 6502 Backplane design.
- Size
- 100 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 36
- Nets
- 72
- Pads
- 341
- Tracks, vias
- 832, 194
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 8 Jul 2023
- Updated
- 15 Aug 2023
Overview
6502-retro is an open-source printed circuit board by linuxplayground, from the linuxplayground/6502-retro repository on GitHub. It is a 4-layer board of 100 × 100 mm with 36 parts on 72 nets, routed with 832 tracks and 194 vias.
It is built around the DS1813-5+ and SN74HC08N. Its parts include 11 capacitors, 8 resistors, 7 ICs, 5 connectors and 2 crystals. It belongs with the retro computing and games boards of this library.
Main components
2DS1813-5+
TO-92-3-40℃~+85℃@(Ta) 1 1.2V~5.5V 150ms 4.75V Active Low No Open Drain Voltage Monitor Yes TO-92-3 Supervisor and Reset ICs ROHSAnalog DevicesSupervisor And Reset ICs
SN74HC08N
DIP-14-40℃~+85℃ 1.5V~4.2V 1.9V、4.4V、5.9V 100mV、100mV、100mV 17ns@6V,50pF 2 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 74HC Series AND Gate DIP-14 Logic Gates ROHSTexas InstrumentsLogic Gates
README
README.md6502-Retro!
Inspired by the Z80-Retro! see: https://github.com/z80-retro I decided to see if I could put together a small 6502 based project with a similar design philosphy. The main goals of the project are:
- The base board must be no larger than 100mm x 100mm to leverage the cheaper manufacturing options.
- The base board must provide all required functionality to be minimially operational.
- Daughter boards will provide additional peripherals such as Graphics and Audio
Base Board
You can find the hardware schematic and gerber files for the base board in hardware/6502-retro.
Expansion Boards
This project contains two expansion boards.
NOTE !!
One of the expansion slots (J1) is too close to the BAUD RATE Oscilator on the base board. It can be used for manual jumper wires maybe, but I would not risk putting a card in there as the solder joints on the back of the card will short against the metal oscilator can for the baud rate clock.
F18A (TMS9918A FPGA)
The F18A from dnotq is mounted with some glue logic on an expansion board. It provides all the same features as the TMS9918A VDP along with some additional enhancments that can be accessed in software.
You can find the hardware schematic here.
General Purpose IO + PS/2
You can find the hardware schematic here.
Note: PS/2 Support is designed for the PERIBOARD-409 P - Mini PS/2 keyboard
This board has a "sign-on" routine that's handled in the PIC16F628A microcontroller. The code for the MCU is included here
The more generic / standard PS/2 Keyboards will require the MCU code to be altered.
Memory Map
The memory map is given by an AT22v10Q PLD which provides ranges in the table below. These values are also defined in 6502-retro-rom.cfg
| Range | Description | Size | Decoder Pins | Comments |
|---|---|---|---|---|
| 0000-00FF | Zero Page | 0x100 | ||
| 0100-0200 | Stack | 0x100 | ||
| 0200-0FFF | SYSRAM | 0xE00 | ||
| 1000-7EFF | RAM | 0x6F00 | ||
| 7F00-7F10 | UNMAPPED | 0x16 | ||
| 7F10-7F1F | FREE | 0x16 | IOCS1 + A4 | IOCS1 is clock qualified |
| 7F20-7F2F | ACIA | 0x16 | IOCS1 + A5 | |
| 7F30-7F3F | UNMAPPED | 0x16 | ||
| 7F40-7F4F | F18A / TMS9918A | 0x16 | IOCS1 + A6 | |
| 7F50-7F8F | UNAMPPED | 0x64 | ||
| 7F90-7F90 | VIA | 0x16 | IOCS2 + A4 | IOCS2 is not clock qualified |
| 7FA0-7FAF | FREE | 0x16 | IOCS2 + A5 | |
| 7FB0-7FBF | UMAPPED | 0x16 | ||
| 7FC0-7FCF | FREE | 0x16 | IOCS2 + A6 | |
| 7FD0-7FEF | UNMAPPED | 0x64 |
- IOCS1 is only active when phi2 is HIGH in the shown address ranges.
- IOCS2 is active in the shown address ranges without any influence by phi2.
See the PLD Code for the WinCUPL design file.
Parts
36| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 0.1uF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C1, C2, C3, C4, C5, C6, C8, C9, C10, C11 |
| 7 | 3.9K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R4, R5, R6, R8, R9, R10 |
| 1 | 0548190519 | digikey-footprints:USB_Mini_B_Female_548190519 | J4 |
| 1 | 1.8432MHz | Oscillator:Oscillator_DIP-14 | X2 |
| 1 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C12 |
| 1 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7 |
| 1 | 28C256 ROM | Package_DIP:DIP-28_W15.24mm_Socket | U2 |
| 1 | 2MHz | Oscillator:Oscillator_DIP-8 | X1 |
| 1 | 62256 SRAM | Package_DIP:DIP-28_W15.24mm_Socket | U1 |
| 1 | 6551 ACIA | Package_DIP:DIP-28_W15.24mm_Socket | U3 |
| 1 | AT22V10Q | Package_DIP:DIP-24_W7.62mm_Socket | U5 |
| 1 | Conn_01x03_Male | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J5 |
| 1 | DS1813 | Package_TO_SOT_THT:TO-92_Inline | U7 |
| 1 | POWER | LED_THT:LED_D5.0mm | D1 |
| 1 | RESET | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW1 |
| 1 | SLOT 1 | Connector_PinSocket_2.54mm:PinSocket_1x38_P2.54mm_Vertical | J1 |
| 1 | SLOT 2 | Connector_PinSocket_2.54mm:PinSocket_1x38_P2.54mm_Vertical | J2 |
| 1 | SLOT 3 | Connector_PinSocket_2.54mm:PinSocket_1x38_P2.54mm_Vertical | J3 |
| 1 | SN74HC08N | Package_DIP:DIP-14_W7.62mm_Socket | U6 |
| 1 | W65C02SxP | Package_DIP:DIP-40_W15.24mm_Socket | U4 |
The 35 most common of 36 parts.
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Questions
How big is the 6502-retro PCB?
It measures 100 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the 6502-retro use?
36 parts, built around the DS1813-5+ and SN74HC08N. 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 6502-retro KiCad files?
From the linuxplayground/6502-retro repository on GitHub, at the commit this page was made from: the board is hardware/6502-retro/6502-retro.kicad_pcb and its schematic hardware/6502-retro-f18a/6502-retro-f18a.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 6502-retro design in my own project?
Its repository states no licence, so its author keeps all rights: ask linuxplayground before reusing the design.