[DeFault User]

Eventually they started publishing programs in machine language with a sum check for accuracy.

Yep, you even had part of your keyboard configured as a number pad. The edge of my C-64 keyboard was worn slick from all the typing action, but it was a lot less frustrating than trying to find the errors in BASIC that had to be copied verbatim.

[Central Scrutiniser]

http://www.computerbrains.com/ccs64/

A good emulator.

Games and software can be downloaded at:

http://www.c64.com/

I'm playing M.U.L.E. best game ever!