New good quality scans added to the Manuals page
– MCS6500 Hardware Manual August 1975 First Edition, Version 6500-10, with errata letter. Not the usual 6500-10A but the rare first edition. No ROR instruction documented!
– MCS6500 Programming Manual by Synertek, version 6500-50. Not the First Edition alas, the contents are the 6500-50A version.

I now have two first edition MOS Technology manuals:
– MCS6500 Hardware Manual August 1975 First Edition, Version 6500-10
– KIM-1 User Manual First Edition, January 1976, no version but could be 6500-15. The newer versions are version 6500-15B

Still missing, but it does exist somewhere, is
– MCS6500 Family Programming Manual, 6500-50. All scans, including mine, are version 6500-50B.

This is the title page of MCS6500 Family Programming Manual, 6500-50, of which no scan is knwon yet.