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1D9D: border_flash: Flash border to colour in A for 300ms.
Used by the routine at telesoftware_main.
border_flash 1D9D OUT ($FE),A Set border to value in A.
1D9F LD B,$0F Set B to 15 as loop counter.
border_flash_0 1DA1 EI Enable interrupts and wait for 15 interrupts (300ms).
1DA2 HALT
1DA3 DJNZ border_flash_0
1DA5 DI Disable interrupts, set border to black, and return.
1DA6 LD A,$00
1DA8 OUT ($FE),A
1DAA RET
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