Routines
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EE97: set the serial data out high
Used by the routines at ED21, ED40, EDFE and EE13.
EE97 AD 00 DD LDA $DD00 read VIA 2 DRA, serial port and video address
EE9A 29 DF AND #%11011111 mask xx0x xxxx, set serial data out high
EE9C 8D 00 DD STA $DD00 save VIA 2 DRA, serial port and video address
EE9F 60 RTS
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