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6 changes: 3 additions & 3 deletions src/c64io/c64io_mapc64.txt
Original file line number Diff line number Diff line change
Expand Up @@ -365,7 +365,7 @@ $D010 MSIGX Most Significant Bits of Sprites 0-7 Horizontal Positi
the horizontal position of the corresponding sprite to a value of 255
or less

$D011 SCROY Vertical Fine Scrolling and Control Register
$D011 SCROLY Vertical Fine Scrolling and Control Register

0-2 Fine scroll display vertically by X scan lines (0-7)
3 Select a 24-row or 25-row text display (1=25 rows, 0=24 rows)
Expand Down Expand Up @@ -807,7 +807,7 @@ $D011 SCROY Vertical Fine Scrolling and Control Register
WAIT 53265,128, but BASIC is usually not fast enough to execute the
next statement while still in the blanking interval.

$D012 RASTE Read Current Raster Scan Line/Write Line to Compare for Raster IRQ
$D012 RASTER Read Current Raster Scan Line/Write Line to Compare for Raster IRQ

The Raster Compare register has two different functions, depending on
whether you are reading from it or writing to it. When this register
Expand Down Expand Up @@ -2180,7 +2180,7 @@ $D418 SIGVOL Volume and Filter Select Register
4 Select low-pass filter, 1=low-pass on
5 Select band-pass filter, 1=band-pass on
6 Select high-pass filter, 1=high-pass on
7 Disconnect output of voice 4, 1=voice 3 off
7 Disconnect output of voice 3, 1=voice 3 off

Bits 0-3 control the volume of all outputs. The possible volume
levels range from 0 (no volume) to 15 (maximum volume). Some level of
Expand Down