Ricoh D158 Service Manual page 681

019 2in1 + Magazine (D158/D159)
020 4in1 + Magazine (D158/D159)
021 6in1 + Magazine (D158/D159)
022 8in1 + Magazine (D158/D159)
023 9in1 + Magazine (D158/D159)
024 16in1 + Magazine (D158/D159)

These counts (SP8421 to SP8427) are especially useful for customers who need to improve
their compliance with ISO standards for the reduction of paper consumption.

Pages that are only partially printed with the n-Up functions are counted as 1 page.

Here is a summary of how the counters work for Booklet and Magazine modes:
Booklet
Original Pages
1
2
3
4
5
6
7
8
SM Appendix
Count Original Pages
1
2
2
2
3
4
4
4
3-223
System SP Tables-8
Magazine
Count
1 1
2 2
3 2
4 2
5 4
6 4
7 4
8 4
D158/D159/D160/D161/D170