Changes

*VRam: 16 kB: There is no real dedicated VRAM, RAM banks can be used as VRAM, the Z80 is then put on wait state while the video circuit reads the RAM bank. Also it is possible to get an overscan mode : the video circuit would read more than one RAM bank, the displayable zone is something like 24K.

*3-channel stereo; [[General Instrument AY-3-8910|AY-3-8912 chip]]<ref name="GX4000 at Old Computers"/>. GX4000/Amstrad PLUS use the same AY as used on ORIC ATMOS, ZXspectrum128/+2/+3, MSX1, AmstradCPC or AtariST (YM clone), yet it may be clocked differently.

Audio output, 2x Digital controller connectors, Analog controller port (IBM standard[well, not exactly]), Lightgun connector (RJ11), Audio and RGB Video output (8-pin DIN), Power supply socket from external PSU, Power supply socket from monitor.