Now I need some OS/8 experts...

Now that OS/8 is running on my 8/A, RL02 system, I find I'm in need of some more detailed help. Although I'm wading through the 900+ pages of the "OS/8 Handbook" (and the Device Extensions document which at least addresses RL01's), I'm having a problem adding device handlers as follows. When I built the OS/8 image, it looks like I added only one RL02 partition (here is the current BUILD printout): Doing a DIR shows "118 Files in 2517 Blocks - 1515 Free Blocks", or ~4000 total blocks on the disk, which is also consistent with one RL02 partition (A=40%,B=40%,C=20%) of the total 10000 free blocks. The RKB0: Diagnostic Pack has several handlers including: RL2SY.BH (which is what I am using), and also RL20.BH, RL21.BH, and RL2E.BH (not sure what that one is). But any attempt to LOAD RKB0:RL20.BH (for example) causes SIMH to stop with a "HALT instruction, PC: 20100 (ISZ 122)" message. I tried removing R2SY: entirely (after setting SYS to RKA0:) and still it won't work when trying to install other RL handlers. Also when reloading it will only allow n=1 (platter) which I suppose is correct. This may be why I only have one partition. I did this over a year ago and don't remember all the details. ANY ideas how to install the next partitions (R20B and C)? Also, since I am planning on adding a second RL02 drive, I will need (I think) R21A, B, C to appear in the active list. Is it even possible to add a second RL02 under OS/8? The C partitions aren't really necessary and are slow. I doubt I will ever get close to filling up even the A and B's (8 Mb per pack).... Thanks for any help. -Charles