it's in the documentation folder of your kernel source tree. 'devices.txt'
34 char Z8530 HDLC driver
0 = /dev/scc0 First Z8530, first port
1 = /dev/scc1 First Z8530, second port
2 = /dev/scc2 Second Z8530, first port
3 = /dev/scc3 Second Z8530, second port
In a previous version these devices were named
/dev/sc1 for /dev/scc0, /dev/sc2 for /dev/scc1, and so
34 block Fourth IDE hard disk/CD-ROM interface
0 = /dev/hdg Master: whole disk (or CD-ROM)
64 = /dev/hdh Slave: whole disk (or CD-ROM)
Partitions are handled the same way as for the first
interface (see major number 3).