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NICE work!
On Thursday, May 9, 2019, 12:26:24 PM PDT, Richard Ufheil [email protected] [KurzList] <[email protected]> wrote:
Hello Roger,
I replaced the FDC controller chip and everybody is happy now. Thanks for your help. Thanks to everyone else who took the time to respond. Now I can go back to composing.
Richard
From: [email protected] <[email protected]> on behalf of Richard Ufheil [email protected] [KurzList] <[email protected]>
Sent: Monday, May 6, 2019 1:41 PM
To: [email protected]
Subject: Re: [KL] Floppy drive on K2500R mounting problems
Roger,
Thanks for the info. No the floppy cable is not a twisted cable. I did some more research and found in the manual that Kurzweil says the floppy drive should be set to zero. I’ll attach a copy of the page. Not that I believe everything the manual says. Just read the section on how to set the termination switch. I’m sure nobody proof read those instructions. Based on the fact that it functions in that mode at this point in time I’ll assume that to be correct. At this point I’ll replace the FDC chip and hope for the best. If that doesn’t work I’ll go the route of swapping the board. I have a lead on one for $100. This would be cheaper than the SCSI card reader route. If the board doesn’t work out then I’ll probably go for the SCSI reader.
Just to double check that there is no way to probe the output from the FDC chip to check function?
Thanks for all the help. If I solve the problem I’ll let you know.
Richard
From: <[email protected]> on behalf of "Roger J [email protected] [KurzList]" <[email protected]>
Reply-To: "[email protected]" <[email protected]>
Date: Monday, May 6, 2019 at 12:52 PM
To: "[email protected]" <[email protected]>
Subject: Re: [KL] Floppy drive on K2500R mounting problems
Richard,
You stated the one that works in a good k2500R jumper for FDD channel A or binary 0. The controller is fix to communiate on B or binary 1. If this is true, if would not mount.
Do you have a DOS era drive modified FDD ribbon cable? These had 5 connectors.. I have used these old style cable when some one brought me a modern plug and play FDD that had no easy or documented way to set to B. These had a split in the ribbon with that section connected to different connector pins. This effectively allowed using " A" FDD as a B. This was back in the day when dos computers had 4 floppy drives, 2 on A and 2 on B. I would slice off the unneeded connectors and retain only the section with standard and the split and moved over connector. These is a quick and cheap way to make an A drive work as a B drive. A "normal k25 add cable has no split. Just a thought to why an A drives could works at all.
Next, both the floppy and the scsi bus share the 8 bit peripheral bus, as does tbe display, midi, communication with effect, scanner, etc. Both have their own controller chips and simple bus chips to isolate or prevent bus interference using a lot of 245 and 244 chips, aka glue.
The diagnostics work well to trouble shoot here, with some cavilots.
Typically the 244s and 245 never fail, more often thru hole connections and trace issues.
Next, I don't recall totallu what j920 was, it has been 10 years since I opened a manual. The early K2500 had a rev A and rev B. They had 2 empty PLCC sockets to add 2 additional flash ROMa when you upgraded to KDFX, as V 4, v5 needed more ROM. The rev C and above came with a simm socket to add the extra flash ROM.
ALSO NOTE, some of these rev A or B rev daughter board need some engineering change orders installed.
Am I "tech talking" in an understandable way?
R
Ps, You can install a 3rd party scsi to floppy adapter. Then plug that into that a memory card slot. This mounts in the removed floppy hole. This has been well documented on this forum.
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On Sat, May 4, 2019 at 9:39 PM, Richard Ufheil [email protected] [KurzList]
<[email protected]> wrote:
Hello Roger,
I did some more digging and I sent a couple of pictures for you to see. The good FDD drive that works in my other K2500R. If you look it clearly is jumpered to DSO or A . If you look at the blown drive it is jumpered to SO or A also and it used to work before the 12v accident. Both units have HDs also. Is there any communication between SCSI and floppy bus?
I’m not opposed to putting a dab of solder on S1 and cutting the connection at SO and giving it a go. It just seems weird that it would read that drive if it was jumpered incorrectly. What do you think?
Richard
From: <[email protected]> on behalf of "Roger J [email protected] [KurzList]" <[email protected]>
Reply-To: "[email protected]" <[email protected]>
Date: Saturday, May 4, 2019 at 4:46 PM
To: "[email protected]" <[email protected]>
Subject: Re: [KL] Floppy drive on K2500R mounting problems
First, L2 is removed keyboards, as this is the clock for the Digi effect chip and the keyboard model had a separate clock source closer to reduce RFI. You will have to add a jumper or another inductor, probably using a jumper will be fine.
Early floppy drive needed 12v and 5 volts. Different vendors used different connectors. Some connector could go on backwards, reversing the 12 and 5 volts. I always looked at the floppy drive circuit board for silkscreening of 5vdc to confirm.
FDD have two channel, the A or 0 and the B or 1. Later FDD in the 90s came jumpers for A only, as then plug n play configured. The drive must be set for B or 1, as the FDD control want to see B channel.
This is a DOS era drive.
Yes, could be the controller chip, it is not fun to replace, as it is a PLCC style chip, typically placed in a PLCC socket. As I recall, you may have to remove components to solder back in. I would remove with a small heatgun, beating the center of the chip until all 44 pins get hot and it slides off with gentle pleasure. Place a strip of metal as a heat shield to prevent other components from also being heat too much.
I have once or twice replaced the FDD controller chip, no joy, only to find other failures to be the cause of no mount.
Do you actually need a floppy? You can install setups from a hard drive. The hard drive is DOS 512. The installer asks for source, FDD or one of 8 scsi channels.
You could also place your CPU Daughter board in a good unit and update the setup or o/s. Make sure it is seated properly, as it is easy to do wrong!
Not sure I cover all your questions, reply if not so.
Best,
Roger
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On Fri, May 3, 2019 at 3:29 PM, Richard Ufheil [email protected] [KurzList]
<[email protected]> wrote:
Hello Roger,
I’m sorry to bother you but I’m turning to you for your advice. I will try to make this as succinct as possible. I have a second K2500R with a floppy drive that will not mount. Here are the facts.
1. The drives power supply was connected to the HDD power connection thus it was getting 12v DC instead of 5v DC.
2. I reconnected the power supply to the FDD connector. On power up an IC on the floppy drives integrated PCB blew.
3. I replaced the drive with a new floppy which I confirmed was good by mounting in my main K2500R.
4. The drive will not mount and fails both drive tests in diagnostics.
5. I swapped all cabling from my other unit and still it would not mount...
6. This leaves me to believe the FDD controller chip is toast.
My question is have you ever encountered this before? If I replace the FDD controller chip should that cure the problem? Are there any other components that might need to be replaced in order to get this floppy to mount?
I have done hard resets and I even reinstalled the operating system. There are no jumpers on the floppy drive so I guess the drive allocation is predetermined in the OS.
One more question for the expert. Can I use an engine board from a keyboard unit in a rack unit. It appears that the engine and daughter board are the same as those used in the keyboard vs the rack. I see that the rack unit has a location of L2 which is not used on the keyboard unit.
Thanks,
Richard
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