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Elite on the BBC Micro

Drawing pixels: PXCL [6502SP version, I/O processor]

Name: PXCL [Show more] Type: Variable Category: Drawing pixels Summary: A four-colour mode 1 pixel byte that represents a dot's distance
Context: See this variable in context in the source code References: This variable is used as follows: * PIXEL calls PXCL

The following table contains colour bytes for 2-pixel mode 1 pixels, with the index into the table representing distance. Closer pixels are at the top, so the closest pixels are cyan/red, then yellow, then red, then red/yellow, then yellow. That said, this table is only used with odd distance values, as set in the parasite's PIXEL3 routine, so in practice the four distances are yellow, red, red/yellow, yellow.
.PXCL EQUB WHITE \ Four mode 1 pixels of colour 3, 2, 3, 2 (cyan/red) EQUB %00001111 \ Four mode 1 pixels of colour 1 (yellow) EQUB %00001111 \ Four mode 1 pixels of colour 1 (yellow) EQUB %11110000 \ Four mode 1 pixels of colour 2 (red) EQUB %11110000 \ Four mode 1 pixels of colour 2 (red) EQUB %10100101 \ Four mode 1 pixels of colour 2, 1, 2, 1 (red/yellow) EQUB %10100101 \ Four mode 1 pixels of colour 2, 1, 2, 1 (red/yellow) EQUB %00001111 \ Four mode 1 pixels of colour 1, 1, 1, 1 (yellow)