Acorn Atom in FPGA

See the Polymorph project pages for the latest features.

This project successfully emulates an Atom with a 1.79 MHz 65C02 running Atom BASIC. It has far more ROM and RAM than the original, and the video circuitry fixes many deficiencies of the 6847. It now has a programmable font, palette, hardware cursor, smooth scrolling, and more display modes.

Main enhancements 1.79 MHz CPU clock speed (79% faster than original) No 'Snow' through full transparent CPU/video memory interleaving PS/2 Keyboard cheap and readily available PS/2 Mouse 50/60 Hz video line/field timings software-selectable 220x100 mm Eurocard 32 or 40 columns of text 16 or 20 rows of text 2nd font of 8x8 pixels for up to 30 rows of text Programmable video base address allows double-buffer animation Low power consumption about 440 mA (instead of original 3 amps!) RGB colour circuitry inside FPGA Printer slave port - for fast input USB slave port - for fast input and output Smooth vertical scrolling for text or graphics Cursor hardware Programmable palette Programmable font Colour screen attributes	Acorn Atom screen shots