Bustek-742 EISA controller (compatible with Adaptec 1742 ?)

Bustek-742 EISA controller (compatible with Adaptec 1742 ?)

Post by Norbert Bla » Wed, 03 Jun 1992 15:50:48



Hi there,

I saw an interesting offer for an EISA system which includes a 330 MB SCSI disk
and the Bustek EISA-SCSI controller (742). Now, that there is a Adaptec-1742
I would really like to get this one. However, this would add to the cost
of the system. Now, my question is whether these controllers are compatible.
I know that the Bustek and the Adaptec-1740 will work with OS/2 2.0. What I
don't know is will these work with Dell or Interactive UNIX and 386BSD-UNIX
and especially the Adaptec-1742 with OS/2 2.0. In other words, is it worth
the trouble and cost of changing the Bustek-742 to an Adaptec-1742 ?

Please, post or e-mail your experience. Because others may be interested in
this, perhaps posting is not a bad idea. But, if this question was asked
several times in the last weeks (which is entirely possible), just mail me
the last summary, etc.

Thanks,

Norbert.

--
Norbert Bladt, Ascom Autelca AG, Worbstr. 201, CH-3073 Guemligen, Switzerland
Phone: +41 31 999 65 52                 FAX: +41 31 999 65 44

--
Norbert Bladt, Ascom Autelca AG, Worbstr. 201, CH-3073 Guemligen, Switzerland
Phone: +41 31 52 95 52                  FAX: +41 31 52 95 44

 
 
 

Bustek-742 EISA controller (compatible with Adaptec 1742 ?)

Post by Paul A Vix » Thu, 04 Jun 1992 00:14:53


the adaptec 174x has a 154x emulation mode which seems quite compatible
with the various 154x drivers.  if the bustek 74x is as similar to the
adaptec 174x as the bustek 54x is to the adaptec 154x, it will have this
emulation mode and you can just use it.  perhaps a call to bustek is in
order?
--
Paul Vixie, DEC Network Systems Lab    
Palo Alto, California, USA              "Ready, Fire, Aim"



 
 
 

Bustek-742 EISA controller (compatible with Adaptec 1742 ?)

Post by Julian Elisch » Sat, 06 Jun 1992 02:19:18



Quote:>Hi there,

>I saw an interesting offer for an EISA system which includes a 330 MB SCSI disk
>and the Bustek EISA-SCSI controller (742). Now, that there is a Adaptec-1742
>I would really like to get this one. However, this would add to the cost
>of the system. Now, my question is whether these controllers are compatible.
>I know that the Bustek and the Adaptec-1740 will work with OS/2 2.0. What I
>don't know is will these work with Dell or Interactive UNIX and 386BSD-UNIX
>and especially the Adaptec-1742 with OS/2 2.0. In other words, is it worth
>the trouble and cost of changing the Bustek-742 to an Adaptec-1742 ?

I don't know the compatibility betweenthe 742 and the 1742
but the 742 comes up emulating a 1542.
I have written drivers for both and run the 742 on the 1542 driver.

My scsi subsystem that some people got copies of in the first week of
the jolitz release included drivers for both the 742 and the 1542.

The 742 driver knows about the extended 32 bit address structures and can be
used with machines with more than 16MB of ram.

We run these drivers on net2, OSF/1 and mach2.6 without source changes, however
the setups are somewhat skewed towards mach and a little 'un-BSD-ish' in
style. (also the disk driver needs setting up with utilities from mach and
CMU have not clarified whether these are PD or not.)

I Have ordered the 1742 technical reference manual so in a couple of
weeks I should be able to either
1/ know it's compatible with the 742a
2/ if not, write a new one.
however, if you have less than 16MB of ram the 742a will run successfully
out of the box as a 1542.

performance for the 742 running as a 1542 is about 2.7MB/sec off a
segate elite ST41600N using 16k raw blocks. the 1542 achieves about 1.5MB/sec
for the same test, but of course that is an ISA card. The 1742 is probably
similar (or better than) to the 742a.

+----------------------------------+       ______ _  __
|   __--_|\  Julian Elischer       |       \     U \/ / On assignment

| (   OZ    ) 2118 Milvia st. Berkeley CA. \___   ___ | country !
+- X_.---._/  USA+(510) 704-3137(wk)           \_/   \\            
          v

 
 
 

Bustek-742 EISA controller (compatible with Adaptec 1742 ?)

Post by Petri Heleni » Sat, 06 Jun 1992 07:31:26



   the adaptec 174x has a 154x emulation mode which seems quite compatible
   with the various 154x drivers.  if the bustek 74x is as similar to the
   adaptec 174x as the bustek 54x is to the adaptec 154x, it will have this
   emulation mode and you can just use it.  perhaps a call to bustek is in
   order?
   --
The BUSTEK controller works fine with ISC 3.0. There is no support (?)
for it in previous versions.

Pete
--
--
 Petri Helenius, Fimeko-Data Oy
 Phone +358-0-458 2421, Telefax +358-0-458 2425

 X.400    /C=fi/ADMD=fumail/PRMD=inet/O=fidata/S=Helenius/G=Petri/

 
 
 

Bustek-742 EISA controller (compatible with Adaptec 1742 ?)

Post by nich.. » Sun, 07 Jun 1992 11:12:48



Quote:> Hi there,

> I saw an interesting offer for an EISA system which includes a 330 MB SCSI disk
> and the Bustek EISA-SCSI controller (742). Now, that there is a Adaptec-1742
> I would really like to get this one. However, this would add to the cost
> of the system. Now, my question is whether these controllers are compatible.

According to BusTek, their BT-742A supports a "superset of AHA-154xB register
and command protocol".  I've heard, but not verified, that their emulation
is very good.

Quote:> I know that the Bustek and the Adaptec-1740 will work with OS/2 2.0. What I
> don't know is will these work with Dell or Interactive UNIX and 386BSD-UNIX
> and especially the Adaptec-1742 with OS/2 2.0.

Interactive UNIX has BusTek drivers packaged with it (and if nothing
else, you can use the 1542B compatibility).

According to documents I've collected, here is a comparison of the two cards:

                                Adaptec AHA1742         BusTek BT-742A
-----------------------------------------------------------------------------
Bus                             EISA                    EISA
Interface                       SCSI-2                  SCSI-2
"Fast" SCSI-2 xfers           Yes                     No
Bus width                       32 bits                 32 bits
Hard + Floppy support           2+5H + 2F               2+5H + 2F   (Note 1)
Maximum xfer rate               <2Ma, <10Ms               <5Ma, <5Ms  (Note 2)
Burst xfer rate                 33MB/Sec                33MB/Sec
Dos address limit               1 GB                    1 GB        (Note 3)
Read-ahead buffer size          N/A                     128 Bytes
Emulation                       N/A                     AHA154xB
On-board processor type         ???                     80188
External Connector              SCSI-2                  Centronix 50-way

Note 1: Two hard drives are supported directly in DOS via the on card BIOS,
        the other drives must use separate driver software (ASPI)

Note 2: "Ma" means MB/Sec asynchronous
        "Ms" means MB/Sec synchronous

Note 3: This is reported as the "maximum capacity that can be recognized
        under DOS".  I don't know whether that means in a single partition,
        or for the disk as a whole.

Quote:> In other words, is it worth
> the trouble and cost of changing the Bustek-742 to an Adaptec-1742 ?

As with many things in life, this is something you will have to decide for
yourself.  If you're planning on using synchronous transfers, then the
AHA1742B claims twice the speed of the BusTek.  It's reversed for
asynchronous transfers.  ( A quick scan through my various disk drive
specs indicate Asynchronous transfer rates are typically between 1.5 and
4 MB/Sec; Synchronous transfer rates seem to be between 4 and 10 MB/Sec.
[An interesting aside, is that some of the drives with the fastest
synchronous rates, have the slower asynchronous rates.] )

> Norbert Bladt, Ascom Autelca AG, Worbstr. 201, CH-3073 Guemligen, Switzerland
> Phone: +41 31 999 65 52                    FAX: +41 31 999 65 44


Hope this helps,

Richard D. Nichols
Teradyne Inc.,  Telecommunications Division
Phone:  (708) 940-9000

 
 
 

Bustek-742 EISA controller (compatible with Adaptec 1742 ?)

Post by Mike » Tue, 09 Jun 1992 03:35:29


>                                    Adaptec AHA1742         BusTek BT-742A
>-----------------------------------------------------------------------------
>Bus                         EISA                    EISA
>Interface                   SCSI-2                  SCSI-2
>"Fast" SCSI-2 xfers               Yes                     No
>Bus width                   32 bits                 32 bits
>Hard + Floppy support               2+5H + 2F               2+5H + 2F   (Note 1)
>Maximum xfer rate           <2Ma, <10Ms               <5Ma, <5Ms  (Note 2)
>Burst xfer rate                     33MB/Sec                33MB/Sec
>Dos address limit           1 GB                    1 GB        (Note 3)
>Read-ahead buffer size              N/A                     128 Bytes
>Emulation                   N/A                     AHA154xB
>On-board processor type             ???                     80188
>External Connector          SCSI-2                  Centronix 50-way

>Richard D. Nichols
>Teradyne Inc.,  Telecommunications Division
>Phone:      (708) 940-9000


All the above seems correct, except for the fact that the 1742 does
have AHA154x immulation as an option.

This is (at the moment) I believe the only way linux will
recognise it.

        MikeE

 
 
 

Bustek-742 EISA controller (compatible with Adaptec 1742 ?)

Post by Patrick Guel » Wed, 10 Jun 1992 05:50:32



|> Hi there,
|>
|> I saw an interesting offer for an EISA system which includes a 330 MB SCSI disk
|> and the Bustek EISA-SCSI controller (742). Now, that there is a Adaptec-1742
|> I would really like to get this one. However, this would add to the cost
|> of the system. Now, my question is whether these controllers are compatible.
|> I know that the Bustek and the Adaptec-1740 will work with OS/2 2.0. What I
|> don't know is will these work with Dell or Interactive UNIX and 386BSD-UNIX
|> and especially the Adaptec-1742 with OS/2 2.0. In other words, is it worth
|> the trouble and cost of changing the Bustek-742 to an Adaptec-1742 ?

As far as I know Bustek SCSI-Controllers are Adaptec-compatible, but I'm not
sure for the EISA-version. The Adaptec-1740 is supported by ISC. But the
performance is really poor for an EISA-controller. You might look at the
DTP-Controllers, they include drivers for all major PC unixes. These
controllers are more expensive but are blindingly fast. They can be upgraded
with cache-modules up to 12 MB as far as I know. I can collect more information
if you're interested.

        -- Patrick

--
Patrick Guelat, Improware AG Switzerland, CH-4414 Fuellinsdorf

 
 
 

Bustek-742 EISA controller (compatible with Adaptec 1742 ?)

Post by Richard Fou » Sun, 14 Jun 1992 11:33:48


Quote:>As far as I know Bustek SCSI-Controllers are Adaptec-compatible, but I'm not
>sure for the EISA-version. The Adaptec-1740 is supported by ISC. But the
>performance is really poor for an EISA-controller. You might look at the
>DTP-Controllers, they include drivers for all major PC unixes. These
>controllers are more expensive but are blindingly fast. They can be upgraded
>with cache-modules up to 12 MB as far as I know. I can collect more information
>if you're interested.

As has been said many times before, caching controllers are much better
suited to DOS than to a multi-tasking OS like unix.  On a general purpose
system they will seldom appear to be `blindingly fast'.

They also create some * reliability problems.  Lose power with
a megabyte or so of cached, but not-yet-written data and you'll surely
never buy such hardware ever again.

Caching of any magnitude under unix needs to be done with the full knowledge
of the kernel.

--

 
 
 

1. Adaptec 1742 EISA and LINUX


Nope - works perfectly.

Karl

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