RAM upgrade from 512 to 640Kb on a Sinclair PC200 by Amstrad Retro Geek
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Genesis8
If you have a Sinclair PC200 (PC XT) still with its RAM default (512 Kb), I invite you to see the video by Amstrad Retro Geek which shows how to upgrade to 640 Kb.
An Amstrad CPC romboard using a raspberry Pico by Matronica
Gotek with deported screen on Amstrad PPC 640 by Dedion30
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Genesis8
An Amstrad PPC 640 with an internal Gotek and a deported screen on System.CFG, done by Dedion30. The deported screen is parked in the slot for the modem cable when the computer is closed.
External Gotek on Sinclair PC200 (or internal with deported screen) by Dedion30
Longshot has released version 1.4 of the Amstrad CPC CRTC Compendium which is a documentation about the CRTC 6845 (and some others circuits). Note that the CRTC is a generic component used in several computers including the IBM PC.
It is possible to check if an emulator is good with the SHAKER tests by Longshot. SHAKER is a program designed to run on CPC machines produced by AMSTRAD in the 80s-90s. The objective of this program is to carry out extensive tests on the video circuits of this machine. These video circuits are the GATE ARRAY and the CRTC 6845. AMSTRAD produced several series of GATE ARRAY and used CRTC models produced by different manufacturers (HITACHI, MOTOROLA, UMC, AMSTRAD). This has been causing compatibility problems on operations that exceed the functional specifications of these circuits. The identified CRTCs are numbered from 0 to 4.