lzm@mace.cc.purdue.edu (Chris McCoy) (09/12/90)
We are currently installing our new RISC/6000 model 320 which is configured with the 320 MB hard disk select, one 150 MB tape backup unit, one CD-ROM, and 32 MB main memory. We also have ETHERNET, Async ports, and the grpahics adapter, thus, we have no more MCA ports available for expansion. While installing this beast, I noticed the service manual indicated that the SCSI channel can support EITHER 4 devices (2 internal, 2 external) or 7 devices (all external). Well, the 320 MB disk is on the internal SCSI and the CD-ROM and TBU are on the external SCSI. According to the installation manual and confirmed by our SE, we cannot add another external SCSI device to this adapter. Our only option is to add another internal 320 MB drive to the internal (of course there are options for swapping what's where, but ...). Does anyone know the scoop on the SCSI adapter? We will need to add another hard disk and would rather purchase a third party drive because of the cost savings. As it stands now, our options are extremely limited. -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Chris McCoy : INTERNET: mccoy@ecn.purdue.edu Communication Systems Programmer : UUCP: ...!ecn-ee!mccoy Ag. Computer Network, Purdue Univ. : VOICE: (317) 494-8339 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
adrian@siesoft.co.uk (Adrian Hussey) (09/19/90)
I'm posting this query for a friend. Any replies, preferably by email, would be greatly appreciated. Thanks for any help you can give. cheers Adrian Hussey P.S. Apologies if this is an inappropriate newsgroup - if it is, information telling me where to go would also be helpful! :-) ============QUESTION=============== I have noticed that the boot file IO.SYS (or IBMBIO.COM) contains large 'blank' areas consisting of long strings of zero bytes. Can anybody out there tell me: 1) what these blank areas are for. 2) do all IO.SYS or IBMBIOS.COM files contain them. 3) is it safe to alter them; ie. store data/code in them. I am interested in writing a short modification to the boot routine & these 'blank' areas would seem like a convenient place to put it; ===================END======================