6809.org.uk

Software

asm6809

asm6809 is a portable cross assembler targeting the Motorola 6809 and Hitachi 6309.

Features arbitrarily complex expressions (with most C-style operators available), forward references, macro expansion and conditional assembly. Output formats are: Raw binary, DragonDOS binary, CoCo RS-DOS (or "DECB") binary, Motorola SREC, Intel HEX.

Blockdown

Falling blocks puzzle game for the Dragon 32/64 and Tandy Colour Computer. 1 or 2 players! Written in 100% Machine Code!

Dunjunz

25 levels of monsters & magic for the Dragon 32/64 and Tandy Colour Computer. 1–4 simultaneous players! Written in 100% Machine Code!

Dunjunz for the Dragon and Tandy Colour Computer is a rewrite of Julian Avis's BBC Micro original.

evilwm

evilwm is a minimalist window manager for the X Window System.

XRoar

XRoar emulates the Dragon 32/64; Tandy Colour Computers 1, 2 and 3; the Tandy MC-10; and some other similar machines or clones. It runs on a wide variety of platforms. Or try XRoar Online directly in your browser.

Hardware

Dragon 64 motherboard

Schematic capture and PCB layout in KiCad. Built & working.

SAMx4

A CPLD-based drop-in replacement for the SN74LS783/MC6883 Synchronous Address Multiplexer or later SN74LS785 variant. Schematic, PCB layout and VHDL source.

SAMx8: Dragon 64 512K expansion

Taking the SAMx4, adding fast SRAM and stripping out anything DRAM-related leads to this 512K memory expansion that also lets the Dragon run double speed with video. Schematic, PCB layout and VHDL source.

Other

Dragon computers

Technical information, history and software for the Dragon 32, Dragon 64 and related computers.

Sock Master's Web Site

John Kowalski's web site hosting seems to have been retired, so it's mirrored here with permission (including his GIME register reference).