The CTWOS variable - Elite on the BBC Micro and NES

       Name: CTWOS                                                   [Show more]
       Type: Variable
   Category: Drawing pixels
    Summary: Ready-made single-pixel character row bytes for mode 5
  Deep dive: Drawing colour pixels in mode 5
    Context: See this variable in context in the source code
 Variations: See code variations for this variable in the different versions
 References: No direct references to this variable in this source file


 This table is not used by the 6502 Second Processor version of Elite. Instead,
 the CTWOS table in the I/O processor code is used, which contains single-pixel
 character row bytes for the mode 2 dashboard.

 There is one extra row to support the use of CTWOS+1,X indexing in the CPIX2
 routine. The extra row is a repeat of the first row, and saves us from having
 to work out whether CTWOS+1+X needs to be wrapped around when drawing a
 two-pixel dash that crosses from one character block into another. See CPIX2
 for more details.


.CTWOS

 EQUB %10001000
 EQUB %01000100
 EQUB %00100010
 EQUB %00010001
 EQUB %10001000
Drawing pixels: CTWOS

[6502 Second Processor version]
