CPU: ZiLOG Z80 processor clocked at 4 MHz MEMORY: 464 CPC+ 64Kb RAM, 6128 CPC+ 128Kb RAM, 32 kb ROM GRAPHICS: 12bit RGB color palette (4096 colors) supporting 32 colors on screen (16 + 15 for sprites + 1 border). Up to 16 hardware sprites. Splitting the display into separate modes and pixel scrolling both became fully supported hardware features. SOUND: AY-3-8912 chip, 3-channel stereo, DMA for high-quality samples (with minimal processor overhead). MEDIA/STORAGE: 464 with Tape deck, 6128 with 3" floppy disk drive Double Side each with 180 Kb. Both had a cartridge system comes from the GX4000 console
In 1990 Amstrad introduced the "Plus" series, 464 and 6128 Plus, which tweaked the hardware and added a cartridge slot to the system Improvements were made to the video display which saw an increase in palette to 4096 colors and gained a capacity for hardware sprites. Splitting the display into separate modes and pixel scrolling both became fully supported hardware features. The former was reasonably easy on the non-"Plus" machines, and the latter possible to some degree using clever programming of the existing Motorola 6845. These models did not do well in the marketplace, failing to attract any substantial third-party support. The 8-bit technology behind the CPC was looking out-of-date by 1990 and Amstrad's marketing failed to promote any significant advantage over the competing Atari ST and Commodore Amiga systems. The new models were not helped by the substantial price difference between cartridge games and their tape and disc counterparts, exacerbated by the tendency to rerelease old games on cartridge without taking advantage of the enhanced Plus hardware. Apart from a more modern (plastic) housing with the name in relieved surface, the computer features a cartridge system, visible in the left upper corner with a yellow edge on the cartridge. This slot system accepts programs (mostly games) that can be loaded considerable faster than using the common cassette tapes or disks. Cartridges are considerably more expensive and rare than tapes, because they never became popular. Apart from the higher price (when compared to cassette tape) and the reduced compatibility another problem plagued this system: you are unable to make a copy, or change the code on the cartridge. On the other hand floppy discs continued to become cheaper and cheaper. Those were the reasons why no other machine, besides the CPC 464+, CPC 6128+ and GX 4000 adopted this slot system. The computer has plenty of ports, some of which I have not yet identified (on the to-do list).