dtvwiki

So the DTV emulates a Commodore C64. What exactly is a C64?

Well, only this: The Commodore 64 is the best selling single personal computer model of all time.

• Wikipedia article, C64

Docs

• Commodore 64 Programmer’s Reference Guide - An ebook of the venerable C64 programmer’s ref guide.
• Mapping the Commodore 64 - Mapping the Commodore 64, by Sheldon Leemon. Pick up a hardcopy, if you can.
• Commodore 64 Memory Map - Commodore 64 Memory Map; Supposedly the most earmarked page from the C64 Programmer’s Guide.

Tools

• Vice - Vice, C64 emulator for Win & Linux. Also emulates VIC-20, PET, etc. Version 2.1 and newer also includes C64DTV emulation.
• SJLOAD - a Jiffy-compatible software fastloader.