Remove heading ids, let pandoc generate them
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James Gregory
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75 changed files with 631 additions and 631 deletions
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@ -11,9 +11,9 @@ pages: 561-585
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---
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## Chapter 30\
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Video Est Omnis Divisa {#Heading1}
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Video Est Omnis Divisa
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### The Joys and Galling Problems of Using Split Screens on the EGA and VGA {#Heading2}
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### The Joys and Galling Problems of Using Split Screens on the EGA and VGA
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The ability to split the screen into two largely independent portions
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one—displayed above the other on the screen—is one of the more
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@ -33,7 +33,7 @@ we do have some ground to cover.
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Let's start with the basic operation of the split screen.
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### How the Split Screen Works {#Heading3}
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### How the Split Screen Works
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The *operation* of the split screen is simplicity itself. A split screen
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start scan line value is programmed into two EGA registers or three VGA
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@ -97,7 +97,7 @@ line displayed; the safest such approach is to set all bits of the split
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screen start scan line to 1. (That is, in fact, the split screen start
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scan line value programmed by the BIOS during a mode set.)
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#### The Split Screen in Action {#Heading4}
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#### The Split Screen in Action
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All of these points are illustrated by Listing 30.1. Listing 30.1 fills
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display memory starting at offset zero (the split screen area of memory)
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@ -509,7 +509,7 @@ Code ends
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end Start
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```
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#### VGA and EGA Split-Screen Operation Don't Mix {#Heading5}
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#### VGA and EGA Split-Screen Operation Don't Mix
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You must set the `IS_VGA` equate at the start of Listing 30.1
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correctly for the adapter the code will run on in order for the program
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@ -537,7 +537,7 @@ highest-resolution mode the VGA and EGA share. That's not the only mode
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the split screen works in, however. In fact, it works in *all* modes, as
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we'll see later.
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### Setting the Split-Screen-Related Registers {#Heading6}
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### Setting the Split-Screen-Related Registers
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Setting the split-screen-related registers is not as simple a matter as
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merely outputting the right values to the right registers; timing is
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@ -585,7 +585,7 @@ aware that the VGA supports 70 Hz frame rates in all non-480-scan-line
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modes, while the VGA in 480-scan-line-modes and the EGA in all color
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modes support 60 Hz frame rates.
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### The Problem with the EGA Split Screen {#Heading7}
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### The Problem with the EGA Split Screen
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I mentioned earlier that the EGA's split screen is a little buggy. How?
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you may well ask, particularly given that Listing 30.1 illustrates that
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@ -618,7 +618,7 @@ split screen is on. This isn't a bug—it's just one of the many areas in
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which the VGA's designers learned from the shortcomings of the EGA and
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went the EGA one better.
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### Split Screen and Panning {#Heading8}
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### Split Screen and Panning
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Back in Chapter 23, I presented a program that performed smooth
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horizontal panning. Smooth horizontal panning consists of two parts:
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@ -661,7 +661,7 @@ can be used to produce an attractive "streaming tape" effect in the
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normal screen while the split screen is used to display non-moving
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information.
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#### The Split Screen and Horizontal Panning: An Example {#Heading9}
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#### The Split Screen and Horizontal Panning: An Example
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Listing 30.2 illustrates the interaction of horizontal smooth panning
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with the split screen, as well as the suppression of pel panning in the
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@ -1107,7 +1107,7 @@ Codeends
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endStart
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```
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### Notes on Setting and Reading Registers {#Heading10}
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### Notes on Setting and Reading Registers
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There are a few interesting points regarding setting and reading
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registers to be made about Listing 30.2. First, bit 5 of the AC Index
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@ -1190,7 +1190,7 @@ What if you wanted to pan faster? Well, you could of course just move
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two pixels at a time rather than one; I assure you no one will ever
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notice when you're panning at a rate of 10 or more times per second.
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### Split Screens in Other Modes {#Heading11}
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### Split Screens in Other Modes
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So far we've only discussed the split screen in mode 10H. What about
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other modes? Generally, the split screen works in any mode; the basic
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@ -1226,7 +1226,7 @@ noticeable on-screen effects depends on the text displayed by a
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particular application; for example, there should be no problem if the
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split screen has a border of blanks on the left side.
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### How Safe? {#Heading12}
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### How Safe?
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So, how safe *is* it to use the split screen? My opinion is that it's
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perfectly safe, although I'd welcome input from people with extensive
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