Display program - Revision history

Jnc: better link target, now that we have it

2022-08-30T15:51:45Z

better link target, now that we have it

Jnc: add some links

2022-07-29T06:05:32Z

add some links

Larsbrinkhoff: Add "display list", fix typo, subroutines.

2022-07-28T06:45:00Z

Add "display list", fix typo, subroutines.

Jnc: An acceptable start...

2018-12-25T17:42:09Z

An acceptable start...

New page

A '''display program''' is a set of [[instruction]]s for a [[vector graphics]] unit, telling it what to show on the [[display]]. The instructions are stored in [[memory]], often the system's [[main memory]].

Tyical instructions are 'display a point' (at a given location), 'display a line' (from one point to another), etc. For display systems with a [[character generator]], there will be instructions to display characters or strings.

There is also usually a jump instruction, so that the display can continually [[refresh]], by jumping back to the start of the display program. That also allows the display program to be built up out of smaller sections. [[Conditional branch]]es are not usually provided, however.

[[Category: Device Basics]]

@@ Line 3: / Line 3: @@
 Typical instructions are 'display a point' (at a given location), 'display a line' (from one point to another), etc. For display systems with a [[character generator]], there will be instructions to display characters or strings.
-There is also usually a [[jump]] instruction, so that the display can continually [[refresh]], by jumping back to the start of the display program. Sometimes there are 'jump to [[subroutine]]' and 'return from subroutine' instructions. That allows the display program to be built up out of smaller sections.
+There is also usually a [[jump]] instruction, so that the display can continually [[display refresh|refresh]], by jumping back to the start of the display program. Sometimes there are 'jump to [[subroutine]]' and 'return from subroutine' instructions. That allows the display program to be built up out of smaller sections.
 [[Conditional branch]]es are not usually provided, although in some cases display processors approach general-purpose processors in their capabilities.
 [[Category: Device Basics]]

@@ Line 3: / Line 3: @@
 Typical instructions are 'display a point' (at a given location), 'display a line' (from one point to another), etc. For display systems with a [[character generator]], there will be instructions to display characters or strings.
-There is also usually a jump instruction, so that the display can continually [[refresh]], by jumping back to the start of the display program. Sometimes there are 'jump to subroutine' and 'return' instructions. That allows the display program to be built up out of smaller sections. [[Conditional branch]]es are not usually provided, although in some cases display processors approach general-purpose processors in capabilities.
+There is also usually a [[jump]] instruction, so that the display can continually [[refresh]], by jumping back to the start of the display program. Sometimes there are 'jump to [[subroutine]]' and 'return from subroutine' instructions. That allows the display program to be built up out of smaller sections.
 [[Category: Device Basics]]

@@ Line 1: / Line 1: @@
-A '''display program''' is a set of [[instruction]]s for a [[vector graphics]] unit, telling it what to show on the [[display]]. The instructions are stored in [[memory]], often the system's [[main memory]].
+A '''display program''', or '''display list''', is a set of [[instruction]]s for a [[vector graphics]] unit, telling it what to show on the [[display]]. The instructions are stored in [[memory]], often the system's [[main memory]].
-Tyical instructions are 'display a point' (at a given location), 'display a line' (from one point to another), etc. For display systems with a [[character generator]], there will be instructions to display characters or strings.
+Typical instructions are 'display a point' (at a given location), 'display a line' (from one point to another), etc. For display systems with a [[character generator]], there will be instructions to display characters or strings.
-There is also usually a jump instruction, so that the display can continually [[refresh]], by jumping back to the start of the display program. That also allows the display program to be built up out of smaller sections. [[Conditional branch]]es are not usually provided, however.
+There is also usually a jump instruction, so that the display can continually [[refresh]], by jumping back to the start of the display program. Sometimes there are 'jump to subroutine' and 'return' instructions. That allows the display program to be built up out of smaller sections. [[Conditional branch]]es are not usually provided, although in some cases display processors approach general-purpose processors in capabilities.
 [[Category: Device Basics]]