Set the border colour

Example code to set the border colour on the Spectrum’s screen

Tags:

Z80 Example

The border colour is managed by the ULA. Changing the border colour is simply writing the required colour to the ULA whilst storing a copy in the BORDCR system variable at 0x5C48 so that the OS also knows what the colour is.

In this example we set the Border to black

Set the Spectrum Screen Border:

setBorder
LDA,0x00Set border to black
LD(BORDCR),ASet OS copy of border colour
OUT(&FE),ASet hardware border colour
RET

Last modified November 3, 2021: Add additional notes to DISPLAYFILE (3a7f050)