Intro and 9133D HDD

[JvZ]

(10-21-2019 02:35 AM)rprosperi Wrote:  There is a wealth of documentation for the 9133 on the HP Computer Museum, just search for "9133". Among those, the "9133-9134 CE Handbook" (and probably others too) include details of jumpers/dip-switches (section III) on the main board which you use to specify the parameters of the hard drive you install, based on the S/N of your drive. It doesn't really say explicitly that one must set these to adapt a new or different hard drive, as HP probably never anticipated owners would be installing their own drives, but I could not get the 251 drive I installed working properly until adjusting these to reflect the drive I installed.

(10-21-2019 03:02 AM)Paul Berger (Canada) Wrote:  The 225 will not work as it has less heads 4 instead of 6, the 251 should work if it spins up ok, the half high Seagates of that vintage had a nasty habit of the heads sticking to the platters. You will need to initialize the drive as well as the 9133 uses 256 bytes/sector and if the drive was previously installed in a PC it will be formatted 512 bytes/sector. Also if you use a larger drive you can increase the capacity of the drive by changing the model jumpers on the controller card, jumper settings are documented in the service manual which is available at hpmuseum.net. Your 225 might work if you change the model jumpers to be a 'H' as the specs for the 20MB 'H' listed in the manual indicate it is a 4 head drive. The drive used in the 40MB Model 'L' would appear to be 256 bytes/sector, 32 sectors/track 977 tracks/surface and 5 surfaces (heads)

Paul.

Thanks for all the replies so far!

Weekend again, so will look further at this. I did read all the manuals on this unit and on the 4-jumper block on the control board of the 9133D (Rev C) and can see they clearly manage certain parameters. Currently they're in the position I marked in red. But I've not quite figured out what each jumper does.

Got another 2 x HP-150 to tackle today and then want to start with the HP-85s and HP-86s (whole new world for me!)