README.md
April 22, 2018 ยท View on GitHub
Propeller Graphics Card
Add-on board and firmware designed for the RC2014 computer to provide graphics capabilities.
Specifications
- Resolution up to 320x240 pixels with 64 colors
- Tile graphics with 8x8 pixels tiles
- Sprites with 8x8 up to 32x32 pixels
- Full screen scroll
- Overlays for score and indicators
- Bitmap graphics modes 320x240x3bpp, 256x192x4bpp and 256x224x4bpp
- RGB PAL, NTSC and VGA output
The board uses I/O ports 40H, 41H, 42H and 43H for programming.
See the Wiki pages for the documentation.
Schematic
| Parts List | |||
|---|---|---|---|
| R1, R2, R16-R31 | 4.700 ohm 1/4 watt | IC1 | MCP1700-3302E/TO |
| R3 | 1.200 ohm 1/4 watt | IC2 | P8X32A-D40 |
| R4 | 33.000 ohm 1/4 watt | IC3 | 24LC512 |
| R5, R7, R9 | 510 ohm 1/4 watt 1% | TR1 | NPN Transistor BC547 |
| R6, R8, R10, R11, R12 | 240 ohm 1/4 watt 1% | JP1 | 3 pin male header |
| R13, R14, R15 | 130 ohm 1/4 watt 1% | JP2 | 1 pin male header |
| R32, R33, R34 | 10.000 ohm 1/4 watt | JP3, JP4 | 2 pin male header |
| C1, C5 | 10 uF 63v elettr. | CN1 | 40 pin male header, right angle |
| C2, C3, C4 | 100.000 pF poly. | CN2 | DB15 HD female connector |
| D1, D2, D3, D4, D5 | 1N4148 | CN4 | 5 pin male header |
| XTAL1 | 5 MHz crystal |