(l)UMC UM6845/UM6845A/UM6845B CRT Controller Features • Applications include smart, programmable, intelligent CRT terminals; video games; information display • Alphanumeric, semi-graphic, and full graphic capability • Fully programmable via processor data bus and can generate timing ·for almost any alphanumeric screen density • Single +5 volt supply, TTL compatibl-e I/O, NMOS Technology • Hardware scrolling by page, line or character • Provides CPU's with synchronous signals to external device • Programmabfe cursor format • Light pen registers and input strobe signal to latch the light pen position on screen • Line buffer-less operation.
No external DMA required.
Reading screen memory is ...

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