190-051 IBM PS/2 ITBU Installation Kit A 65SX and 8580
190-181 IBM PS/2 ITBU Installation Kit B 65SX, 80, 90 and 95
191-093 IBM PS/2 ITBU Installation Kit C 8540, 8565, 8580, 8590 and 8595
193-126 IBM ITBU Installation Kit D NOTE: Allows PS/2 ITBU drive to be used in:
VP 6382, 6384, 6387, PS/1 2155, EduQuest 9603, 9604, 9605
itbudiag.exe Internal Tape (ITBU) diags ver 2.0
itbuopt.exe ITBU Opt/Diag & Adapter Diskettes
Looks like the diagnostics are from PS2TAPE from Irwin Magnetic Systems Inc.
Making floppy drive adapter (by Bob Eager)
ITBU Main PCB 4302005
> What is the purpose of the 10 pin header J8 to the immediate left of the edgecard? It has a two wire jumper on the second pin pair from the edgecard.
Rick Ekblaw reaches way up and snags it with:
Internal Tape Backup Unit Installation Kits for PS/2s
The IBM PS/2 Internal Tape Backup Unit is an internally mounted product that performs fixed disk backup and restore for the following IBM PS/2 products.
30F5279 Installation Kit A 65SX, 8580
64F7465 Installation Kit B 65SX, 80, 90 and 95
87F9826 Installation Kit C 8540, 8565, 8580, 8590 and 8595
Not sure of this snippet from the EPRM:
8525, 30, 50, 55, 60, 65, 70, 80, 9556, 57, 76, 77
IBM PS/2 INTERNAL TAPE INSTALLED IN 95XX
Record number: H12308
Customers that have installed a IBM Internal tape drive in the following machines
And are having trouble using their tape drive. Check to see if the tape drive is connected to the third berg connector (usually the nearest connector to the motherboard). This cable will usually have a mark on the connector with the following labels:
The tape drive generally will be connected
to the second berg, but to be correct it should be
installed in the 3rd connector and the 3rd drive bay of
these boxes 9577, 9557.
**PS/2's that have 3 berg connectors on them could also be 8590 and 8595.
In the case of machines running 4680 OS, the 2nd
connector of the cable should be used. Keep in mind that
DIAGNOSTICS MAY FAIL WHEN THE TAPE DRIVE IS ATTACHED TO
THE 2ND DROP.
ITBU Use on Later Systems
>I have never been able to get the PS2-Tape working on 9595 type 4 complex. No problems on an 8595 or a SCSI MB 77.
The unit allows the user to transfer up to 80MB or 120MB of data from a fixed disk to a removable tape cartridge. The tape drive slides into the Diskette Drive B slot in the PS/2.
The ITBU uses a 3.5" mini tape cartridge. The following
cartridges are supported:
Any media that meet the specification in the Proposed ANSI Standard X335/87-218 "Unrecorded Magnetic Tape Mini-cartridge" for Information Exchange.
The tape unit requires the IBM PS/2 ITBU Backup program for operation. This program is not provided with this option. (PCTOOLS V-7.x and other Utilities)
Accelerator Cards Irwin 4100MC 1-Mbit (MCA)
ADF Sections for 4100MC
o Supports Models 50, 60, 70, and 80
o Up to 80Mb storage capacity
o Supports data interchange between PS/2 Models 50, 60, 70, or 80
o Internal unit 3.25" form factor
o Slides into existing diskette controller (Drive B position)
o Accurate head positioning using closed-loop embedded servo
o Uses 1/4" tape mini-cartridges
o Backup rate approximately 2Mb/minute.
EXTENDED LENGTH MINI TAPE
Installing the Tape Unit
Cleaning the Tape Unit
ITBU AIX Drivers
>Can aix 1.2 talk to the internal tape unit? That's the one that sits in the second drive bay on a model 70. If so, what device does it respond to?
The driver works fairly well, but you cannot mount the
drive, only backup and restore to/from it. Also the
documentation on the RPQ is vertually non-existant. You
have to read through the file:
It turns out that the 'backup' program (when invoked with -f/dev/rst0) defaults to a tape density (d) of 700 bytes per inch and a tape length(s) of 4500 feet. That works out to a limit of 36,000 1K blocks per tape cartridge. In other words, 'backup' does not automatically determine the type of cartridge installed and write an amount of data appropriate to the installed cartridge.
The documentation tells us we CAN'T change the density parameter or the tape length parameter when used with the ITBU. This morning I tried playing around with the -d and -s parameters and I can now say that the documentation is wrong. It is possible to tweak these values and have 'backup' use much more of the tape cartridges.
There are several known facts:
The ITBU hardware uses 32 data
A little on the conservative side, I want 'backup' to use only 75 MB of a DC2080 tape and 115 MB of a DC2120 tape (to allow for bad blocks which should be formatted out). So ...
Total Capacity = tape density * tape length * 12
tape density = Total Capacity /
(tape length * 12)
The tape density is the same for both DC2080 and DC2120 tapes, the increased capacity is due only to the increased tape length.
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find . -print ! /etc/backup -s 6560 -d 1000 -i -v -f/dev/rst0
For DC2120 tapes:
find . -print ! /etc/backup -s 9840 -d 1000 -i -v -f/dev/rst0
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> Is there a utility for formatting rhomat tapes of 120 meg? I have formatted many of the 80 meg but my utility doesn't include 120 meg and they show only 80 meg when using that utility.
Bob Eager sez
> The 2120 will work; so will the 2080. However, it needs to be the Rhomat format with special servo tracks. Either get Rhomat format tapes, or get truly blank tapes and format them (takes 2-3 hours).
Just to expound on that last point a bit: When Bob says "truly blank", he means it. I had received a small herd (30 to 40) of DC2120 Ximat tapes that I wanted to reformat and use in the ITBU. Since I have a Taberaser 409 available to me at work (a 40-plus pound monster of a tape degausser, intended to work with reel tapes, including the old wide reel-to-reel video tapes), I figured that erasing the DC2120 tapes would be easy. Each one I tried would start running the format procedure, and fail after an hour or so. Then I got the word that they had to be *really* erased to reformat to Rhomat. So I took the tapes back to the Taberaser, placed them metal side up, and hit each one with 4 erase cycles. Every single tape then formatted properly (running PMTAPE under OS/2, of course, but I would expect that the DOS version of the ITBU tape program would work as well).
@707E.ADF Irwin 4100MC Controller
Interrupt Request Level