๐ฌ๐ง Amstrad CPC664: Part 2 (Troubleshooting Starts) [TCE #0474]
24Unfortunately this fellow doesn't work at the moment - no video output. The CPC664 originally came with the 40008 gate array, later replaced by the pin-compatible 40010. The orignal 40007 in the CPC464 isn't pin compatible.
I can see that there is a 4MHz clock into the Zilog Z80 but not much else activity. There has been some repair work done on this machine - I can see that three of the DRAM chips have been replaced (now socketed) and I don't believe the 40010 is original to the machine.
Let's see.
vRetro's 40007 & 40010 replacements:
https://www.vretrodesign.com/collections/for-amstrad-cpc-computers
Open source replacements:
https://github.com/codedchip/AMSGateArray
Interesting read about the Gate Array:
https://www.grimware.org/doku.php/documentations/devices/gatearraydo=export_xhtml