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#1
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scsi controller ? (obsolete ISA type)
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 |
#2
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philo wrote: 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 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. |
#3
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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. 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 |
#4
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philo wrote: 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. 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 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. |
#5
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wrote in message ... philo wrote: 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. 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 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. 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 |
#6
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philo wrote: wrote in message ... philo wrote: 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. 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 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. 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 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. |
#7
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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. 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 |
#8
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philo wrote: 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. 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 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? |
#9
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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? 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 |
#10
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Only SCSI devices can connect to a SCSI controller.
"philo" wrote in message ... 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 |
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