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In page Commodore 128:
"A few C64 programs would lack sound effects and music because on a C64 the SID chip $D4xx memory page was also mirrored on $D5xx, $D6xx and $D7xx pages, while on a C128 it was only accessible through $D4xx page. This is not a common issue, since the C64 reference guide only describes registers in $D4xx in details while describing $D5xx-$D8xx just as "SID IMAGES", making most programs accessing them through $D4xx page and hence have the sound getting played as intended on a C128.[citation needed]
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