Amstrad released the CPC 664 in june 1985 (knowing that the CPC 6128 would follow very soon). It is based upon the 464 hardware but with a built-in 3” disc drive interface instead of the tape deck. Besides, a revised version (40008) of the Gate Array appeared, the first Gate Array version (40007) used in the 464 was not very reliable. It was possible to purchase a CPC 664 with a green screen (GT65) or color screen (CTM644). The built-in disc drive interface is the same than the Amstrad DDI-1 add-on for the 464.

Like the 464, it has it's OS and BASIC interpreter built-in as ROMs, but the Amstrad firmware got updated to version 2 and the Locomotive BASIC to v1.1.

The project codename was IDIOT: Includes Disc Instead Of Tape (don't take that too seriously, I'm not sure at all about it but I find it very funny :)

• Amstrad CPC 664, CTM644 and GT65 Service manual.

• Amstrad Firmware v2.0 (English) (Amstrad 40022)
• Locomotive BASIC 1.1 (Amstrad 40022)
• AmsDOS v0.5 (Amstrad 40015)

This is what a CPC 664 displays on startup (with a color monitor/tv set). The firmware indicate (v2) and the Locomotive BASIC say 1.1

Further informations about the CPC 664 can be found at these websites:

• CPC-Wiki
• Wikipedia

The CPC 664 only had an english keyboard layout (no french/spanish/etc localisations were made).