Vdc Register

Some articles on vdc, registers, register:

MOS Technology 8563 - Programming
... Addressing the VDC's internal registers and dedicated video memory must be accomplished by indirect means ... First the program must tell the VDC which of its 37 internal registers is to be accessed ... Next the program must wait until the VDC is ready for the access, after which a read or write on the selected internal register may be performed ...
MOS Technology 8568
... The 8568 Video Display Controller (VDC) was MOS Technology's graphics processor responsible for the 80 column or RGBI display on D models of the Commodore 128 personal computer ... line (/INTR), which was asserted when the "ready" bit in the 8568's status register changed from 0 to 1 ... Reading the control register would automatically deassert /INTR ...

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