Changes
CRTC
,/* Internal Counters */
! Abbr
! Alternate name
! Compared with
! Comment
|-
|HCC
|C0
|R0, R1, R2
| Increments on every clock cycle
|-
|HSC
|C3l
|R3l
|
|-
|VCC
|C4
|R4, R6, R7
|
|-
|VSC
|C3h
|R3h
|-
|Vertical Line Counter
|VLC
|C9
|R9
|If not in IVM mode, this counter is exposed on CRTC pins RA0..RA4
|-
|VTAC
|C5
|R5
|This counter does not exist on CRTCs 0/3/4. C9 is reused instead
|-
|Frame Counter
|FC
|
|
|Used to alternate frames in interlace and for CRTC cursor blinking
|Memory Address
|MA
|
|
|This counter is exposed on CRTC pins MA0..MA13
