The magazine "Retro Gamer" had a great article about the 64GS in issue 83 (late 2010).
Some items of note :
- Commodore sold approx. 20,00 units out of 80,00 made.
- Leftover components were used in C64Cs.
- There is RUMOR of a C64CGS, a 64GS with a keyboard. Reportedly sited in Ireland.
- There were 27 official released cartridges for the GS.
- The GS has additional ware in the ROM for drop-down menus, but using it would cause incompatibility with the original 64.