scsi controller ? (obsolete ISA type)

  • Thread starter Thread starter philo
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philo

just for the heck of it i decided to work on a 486 that i had sitting
up in my attic. i have two ISA , SCSI controllers and a few small
SCSI harddrives.

due to too many IRQ conflicts, i had to remove the original ide controller
to get the SCSI controller to work (and it detects the harddrive fine)

however...the floppy drives were also connected to the original ide
controller
but when i connect them to the SCSI controller, they are not detected on
either of the controllers i have.

is there anything special i need to to in order to have the controllers
detect the floppy drives?

philo
 
philo said:
just for the heck of it i decided to work on a 486 that i had sitting
up in my attic. i have two ISA , SCSI controllers and a few small
SCSI harddrives.

due to too many IRQ conflicts, i had to remove the original ide controller
to get the SCSI controller to work (and it detects the harddrive fine)

however...the floppy drives were also connected to the original ide
controller
but when i connect them to the SCSI controller, they are not detected on
either of the controllers i have.

is there anything special i need to to in order to have the controllers
detect the floppy drives?

philo
Click to expand...
Could it be that you have two floppy controllers enabled??? Try
disabling one of them. There may be a setting in CMOS for the on board
floppy controller, or a jumper on the SCSI card for disabling it.
 
Could it be that you have two floppy controllers enabled??? Try
disabling one of them. There may be a setting in CMOS for the on board
floppy controller, or a jumper on the SCSI card for disabling it.
Click to expand...

i guess i'd better go to the adaptec website and check the jumper
settings...
you sure can't tell by looking at it...
there is no option to enter cmos like there would be on the newer scsi cards

thanks

philo
 
philo said:
i guess i'd better go to the adaptec website and check the jumper
settings...
you sure can't tell by looking at it...
there is no option to enter cmos like there would be on the newer scsi cards

thanks

philo
Click to expand...
What model of SCSI card do you have? Also, when I referred to CMOS, I
meant the CMOS for the mother board. Sometimes you can disable it and
the conflict with the controller on the SCSI card will go away.
 
What model of SCSI card do you have? Also, when I referred to CMOS, I
meant the CMOS for the mother board. Sometimes you can disable it and
the conflict with the controller on the SCSI card will go away.
Click to expand...

yes...i knew that...i tried it both ways. with floppies enabled in the
(mobo) bios
and without.

the two boards i have are AHA-1542b & 1522

the last time i checked , adaptec did still list the specs of obsolete
boards on their website... i just recalled seeing jumpers to set the IRQ...

i'll have to go back there and look around when i get the time

thanks... this was more a matter of curiosity...it's not like i really need
to use a 486 <G> !

philo
 
philo said:
yes...i knew that...i tried it both ways. with floppies enabled in the
(mobo) bios
and without.

the two boards i have are AHA-1542b & 1522

the last time i checked , adaptec did still list the specs of obsolete
boards on their website... i just recalled seeing jumpers to set the IRQ...

i'll have to go back there and look around when i get the time

thanks... this was more a matter of curiosity...it's not like i really need
to use a 486 <G> !

philo
Click to expand...
The file you want is aha1540b_um.pdf and there were two hits on Google.
They are both in Taiwan, so I don't know what it will look like. I
have the file and will send it if you want and post a valid address. It
is 709 KB in size. Let me caution you however, I had a very similar
experience with these boards, and I don't know that I ever solved it.
Your results may vary.
 
The file you want is aha1540b_um.pdf and there were two hits on Google.
They are both in Taiwan, so I don't know what it will look like. I
have the file and will send it if you want and post a valid address. It
is 709 KB in size. Let me caution you however, I had a very similar
experience with these boards, and I don't know that I ever solved it.
Your results may vary.
Click to expand...


thank you for very valuable help!

according the the manual on the 1542B pin1 of jumper J8 must be on
to enable floppy....the jumper was off...so i'll have to give it a try
tomorrow


much appreciated!

philo
 
philo said:
thank you for very valuable help!

according the the manual on the 1542B pin1 of jumper J8 must be on
to enable floppy....the jumper was off...so i'll have to give it a try
tomorrow


much appreciated!

philo
Click to expand...
You might experiment with the address used by the floppy controller on
the SCSI card in addition to the enable/disable jumper. It is possible
that you might avoid the conflict with the correct setting. As I said,
I did not have much luck, but you might if you stick with it?
 
You might experiment with the address used by the floppy controller on
the SCSI card in addition to the enable/disable jumper. It is possible
that you might avoid the conflict with the correct setting. As I said,
I did not have much luck, but you might if you stick with it?
Click to expand...

guess what?
i just put on the jumper and it worked on the first try...
( i just put the scsi card in place of the ide controller)

thanks!

philo
 
ProfGene said:
Only SCSI devices can connect to a SCSI controller.
Click to expand...

Some SCSI controllers also have floppy controllers, especially the older
ones, such as the poster has. Machines of this era han the I/O ports
(including HDD and FDD) on an add-in card as opposed to being on the mobo as
newer machines do. Therefore, if someone was going to replace an IDE based
card with a SCSI one, the SCSI one would have a FDD controller on it as well
as the original FDD controler had been removed on the IDE card.

Get it?
 
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