The WHITETEXT subroutine - Elite on the BBC Micro and NES

       Name: WHITETEXT                                               [Show more]
       Type: Subroutine
   Category: Text
    Summary: Switch to white text
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * JMTB calls WHITETEXT
             * MT29 calls WHITETEXT


.WHITETEXT

 LDA #32                \ Send a #SETVDU19 32 command to the I/O processor to
 JSR DOVDU19            \ switch to the mode 1 palette for the title screen,
                        \ which is yellow (colour 1), white (colour 2) and cyan
                        \ (colour 3)

 LDA #RED               \ Send a #SETCOL RED command to the I/O processor to
 JMP DOCOL              \ switch to colour 2, which is white in the title
                        \ screen, and return from the subroutine using a tail
                        \ call

[X]

Subroutine DOCOL (category: Text)

Set the text colour by sending a #SETCOL command to the I/O processor

[X]

Subroutine DOVDU19 (category: Drawing the screen)

Change the mode 1 palette by sending a #SETVDU19 command to the I/O processor

[X]

Configuration variable RED = %11110000

Four mode 1 pixels of colour 2 (red, magenta or white)

Text: WHITETEXT

[6502 Second Processor version]