![Motherboard - Keyboard Controller Testing Description - QuickTech Self Boot PC Hardware Diagnostic – Ultra-X, Inc. Motherboard - Keyboard Controller Testing Description - QuickTech Self Boot PC Hardware Diagnostic – Ultra-X, Inc.](https://uxd.zendesk.com/hc/article_attachments/360014716451/mceclip0.png)
Motherboard - Keyboard Controller Testing Description - QuickTech Self Boot PC Hardware Diagnostic – Ultra-X, Inc.
![Tube Time (@tubetime@mastodon.social) on Twitter: "this little guy is the 8042. normally it just controls the keyboard, but on the IBM AT, they gave it control over the address line 20 gate... Tube Time (@tubetime@mastodon.social) on Twitter: "this little guy is the 8042. normally it just controls the keyboard, but on the IBM AT, they gave it control over the address line 20 gate...](https://pbs.twimg.com/media/D_TjNhtVUAE13Ba.jpg:large)
Tube Time (@tubetime@mastodon.social) on Twitter: "this little guy is the 8042. normally it just controls the keyboard, but on the IBM AT, they gave it control over the address line 20 gate...
![Table II from Design of Implementation of a Compatible Keyboard Controller for Keyboards and Mice | Semantic Scholar Table II from Design of Implementation of a Compatible Keyboard Controller for Keyboards and Mice | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/ae4df8d8b8cf2119f90167f0686a610496a5a0e2/1-TableII-1.png)
Table II from Design of Implementation of a Compatible Keyboard Controller for Keyboards and Mice | Semantic Scholar
![8042 Keyboard Controller Embedded Special Microcontroller Ic Sch3226i-sy-tr Surface Mount - Buy Lpc Io With 8042 Kbc/ Reset Gene Sch3226i-sy-tr,Sch3226i-sy-tr Apply To I/o Controller Chip,Logic Electronic Chip With Core Processor 8042 Keyboard 8042 Keyboard Controller Embedded Special Microcontroller Ic Sch3226i-sy-tr Surface Mount - Buy Lpc Io With 8042 Kbc/ Reset Gene Sch3226i-sy-tr,Sch3226i-sy-tr Apply To I/o Controller Chip,Logic Electronic Chip With Core Processor 8042 Keyboard](https://sc04.alicdn.com/kf/Hb7e028c198d44b1abbf0c42fe80a4562L.jpg)