The Vectron 65 Plus is a 6502 CPU-based computer with keyboard support that can run BASIC. It is highly extensible via 32 GPIO pins.
At present, I have built the following peripherals for the computer:
- Vectron VGA Plus v2 - VGA output with pixel-level control
- Vectron VGA Plus Text Mode - Add-on for Vectron VGA Plus v2 that simplifies displaying text on screen
- Vectron Sound Plus - Audio output with the AY-3-8910 sound generator chip
Read on for demonstrations of each of these add-ons.
This is an enhanced version of my Vectron 65 computer.
How It Works
At the heart of the system is a WDC 65C02 CPU running at 8 MHz. 32 KB of SRAM is available, and a 32 KB ROM chip stores the program to execute (you can burn the ROM with my Arduino code). A pair of 6522 VIA chips add a total of 32 GPIO pins to interface with external peripherals. A PS/2 connector is present to support a keyboard (or a mouse, in theory, though I haven't tried one yet) — the clock and data lines are routed to GPIO pins.
This is the circuit design:
And for audio, I added in the Vectron Sound Plus module:
You can download an MP3 here of a tune I made with it.
And a few more pictures:
Bill of Materials
- 1 x 65C02 CPU
- 2 x 6522 VIA
- 1 x 28C256 ROM
- 1 x AS6C62256A RAM
- 4 x 74682
- 1 x 7404
- 1 x 7408
- 1 x 7432
- 1 x 8 MHz crystal oscillator
- 1 x push button
- 4 x 3.3K resistors
- 2 x 5.1K resistors
- 2 x 10K resistors
- 3 x 47 uF electrolytic capacitors
- 14 x 0.1 uF ceramic capacitors
- 1 x PS/2 connector
- 1 x PCB (Kicad design file here)
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