C64 character set editor
Hint: SPACE toggles pixel. Menus are on screen.
Note: saves to FONT.BIN overwriting any existing file. Manual load from BASIC is initially required to edit a font (after running/initializing editor, and exiting).
LOAD "FONT.BIN",8,1
And wrote a blog entry. Includes more details on keys for operations.
Abbreviated Memory map - C64
0000-03FF lower RAM
0400-07FF video RAM
0800-1FFF available (was program RAM) ****
2000-2FFF character RAM sets (was program RAM) ****
3000-9FFF program RAM (reduced)
D000-D7FF character RAM set 1 (uppercase/graphics) -- banked
D800-DFFF character RAM set 2 (lowercase/uppercase) -- banked
There is also ch20edit for Vic-20