[[File:Amstrad.40489.asic.jpg|thumb|right|Amstrad Plus ASIC]]
'''Application-Specific Integrated Circuit''' (ASIC)
==Amstrad custom chips==
The Amstrad CPC used one custom chip: the video [[Video Gate Array]] (also called VGA – no connection with the Video PC standard).
Later [[CPC]] cost down series included a "pre-ASIC"-called ASIC chip to merge the VGA [[Gate Array]] and the [[CRTC]].
The Amstrad [[Plus]] included a "second heart" simply referred as the ASIC.
* Printer Port Data and Strobe
* Floppy Motor enable [[flip-flop]], Floppy Address decoding (FDC chip Select)
The ASIC has a configuration resistor (R128) distinguishing between 6128 Plus and other mainboards. It disables the AMSDOS ROM mapping and the PAL component on the 464 Plus and GX4000. [https://www.cpcwiki.eu/forum/news-events/announcing-sonic-gx-a-new-episode-of-sonic-the-hedgehog-for-amstrad-gx-4000/msg248436/#msg248436 Source]
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