- NEC µPD7220
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The High-Performance Graphics Display Controller 7220 (commonly µPD7220) is a video interface controller developed by NEC and used among others in its APC III computers and the Epson QX-10.
A CMOS variant is called µPD72020.
Internals
Two I/O channels are used, addressing A0 and A1. Reading A0 retrieves the 7220 status. Reading A1 fetches the first byte from the internal queue. Writing to the 7220 uses both registers; A1 for writing the command, A0 for writing the parameters to the queue.
External links
- uPD7220/uPD7220A User Manual, December 1985
- The data sheet
- Direct access with Turbo Pascal
- Source code of driver for CP/M-86
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