|#F8EC||?||[[Music Machine]] ACIA Control|| - ||Write
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|#F8ED||?||[[Music Machine]]| ACIA Data | Write| - || Write
|-
|#F8ED||?||[[Schneider RS232 Interface]] Z80 STI Receiver Status Register||Read||Write
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|#F8EE||?||[[Music Machine]]| ACIA Status||Read|| -
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|#F8EE||?||[[Schneider RS232 Interface]] Z80 STI Transmitter Status Register||Read||Write
|#F8EF||?||[[Schneider RS232 Interface]] Z80 STI USART Data Register||Read||Write
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|#F8EF||?||[[Music Machine]]| ACIA Data Read||Read|| -
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|#F8E2 - #F8E4||?||[[Universeller EPROM Programmer 4004|Dobbertin Eprommer 4003]]||?||?