Routines
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E9FF: clear screen line X
Used by the routines at E544, E8EA and E965.
E9FF A0 27 LDY #$27 set number of columns to clear
EA01 20 F0 E9 JSR $E9F0 fetch a screen address
EA04 20 24 EA JSR $EA24 calculate the pointer to colour RAM
EA07 20 DA E4 JSR $E4DA save the current colour to the colour RAM
EA0A A9 20 LDA #" " set [SPACE]
EA0C 91 D1 STA ($D1),Y clear character in current screen line
EA0E 88 DEY decrement index
EA0F 10 F6 BPL $EA07 loop if more to do
EA11 60 RTS
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