Re: 5.25 floppies that read but don't write

> Do we know the make/model of this drive? It's a Chinon FR-506 (NOT an FZ-506) >On 5.25" HD drives, pin 2 is generally a drive *input*. That is, the >host telegraphs what's needed, not the drive. Indeed, you have to be careful to put the right media and issue the proper density specific format

Re: 5.25 floppies that read but don't write

Do we know the make/model of this drive? - Original Message - From: "Marc Verdiell" To: Sent: Saturday, August 22, 2015 12:50 AM Subject: RE: 5.25 floppies that read but don't write Chuck, I looked at the pin 2 signal and resulting drive behavior. It doesn&

Re: 5.25 floppies that read but don't write

On 08/21/2015 09:50 PM, Marc Verdiell wrote: Chuck, I looked at the pin 2 signal and resulting drive behavior. It doesn't properly auto-switch between densities as it should. It does switch it for reading, but not for writing. Below is the full story. On 5.25" HD drives, pin 2 is generally a d

RE: 5.25 floppies that read but don't write

Chuck, I looked at the pin 2 signal and resulting drive behavior. It doesn't properly auto-switch between densities as it should. It does switch it for reading, but not for writing. Below is the full story. There is one jumper that controls DD/HD switching mode. In the auto position, I can read

RE: 5.25 floppies that read but don't write

Thanks Chuck. Looks like you are on to something, I'll search in this direction. Unlikely it has anything to do with the disks themselves, which were blank. The 500 kHz write signal present on the connector just doesn't make it to the head, whereas the 300 kHz does. On the other handm something alo

Re: 5.25 floppies that read but don't write

Re: Degaussing floppies. Only part of degaussing a floppy is getting a strong enough degausser--I use on made for wiping VHS carts--it gets very hot after only about 3 minutes of use and the thermal cutout belays my impatience until it cools off. So it's definitely not wimpy. However, to u

Re: 5.25 floppies that read but don't write

On Thu, Aug 20, 2015 at 9:01 PM, dwight wrote: > If you are really interested in creating 360K disk, you must have a 360Kdrive. And beyond that, sometimes trying to format or write to a "360K" (48 TPI) disk in a "1.2M" (96 TPI) drive does appear to work, and may even appear to read reliably on th

RE: 5.25 floppies that read but don't write

> Date: Thu, 20 Aug 2015 13:57:05 -0700 > From: ccl...@sydex.com > To: gene...@classiccmp.org; classiccmp.org:On-Topic and Off-Topic Posts > cctalk@classiccmp.org > Subject: Re: 5.25 floppies that read but don't write > > On 08/20/2015 01:04 PM, Marc Verdiell wrote:

Re: 5.25 floppies that read but don't write

On 08/20/2015 01:04 PM, Marc Verdiell wrote: So I tried to force formatting in DOS at 360k, and sure enough it worked! I can then read the diskette back, write on it, etc... And of course it failed formatting at 1.2 Mb. But the drive (Chinon FR-506) is a 1.2M one, and reads fine at 1.2M! Any clu

Re: 5.25 floppies that read but don't write

ex.com > To: cctalk@classiccmp.org > Subject: Re: 5.25 floppies that read but don't write > > On 08/18/2015 09:05 PM, Marc Verdiell wrote: > > > > > > I have connected a 1.2M 5.25" floppy to my computer. After a bit of > > jumper learning and setting, it'

Re: 5.25 floppies that read but don't write

On 08/19/2015 09:10 PM, Fred Cisin wrote: We also had some fun when the purchasing department gave us HD disks! (for use in TRS80 model 1 SD) They would sometimes FORMAT, WRITE, READ, and then minutes later, be blank again. The purchasing agent was in bed with somebody peddling RoyType, and kep

RE: 5.25 floppies that read but don't write

Just in case anybody was unaware, . . . VERIFY is NOT a suitable test in this situation. Most beginners assume that VERIFY will re-read the track, and determine whether the write wrote the correct content. IT DOES NOT. VERIFY checks the sector headers and CRCs, and determines whether there is

RE: 5.25 floppies that read but don't write

eraser. Then when formatting, make sure you select the option to format as a 360K. It still may not read well on a 360K drive but that is life. Dwight > Date: Tue, 18 Aug 2015 21:30:31 -0700 > From: ccl...@sydex.com > To: cctalk@classiccmp.org > Subject: Re: 5.25 floppies that read but

Re: 5.25 floppies that read but don't write

On 08/18/2015 09:05 PM, Marc Verdiell wrote: I have connected a 1.2M 5.25" floppy to my computer. After a bit of jumper learning and setting, it's recognized and reads my old DD and HD floppies fine. But for the life of me I cannot write to it. Not under DOS, Win98, or WindowsXP. Which all read

Re: 5.25 floppies that read but don't write

If reads go fine all around, but nothing will write, I'd be concerned that the write electronics (write amp, etc.) might be defective. But try Will'm D's suggestions, before taking that line, of course.. On Tue, Aug 18, 2015 at 11:12 PM, william degnan wrote: > Try swapping both a and b drives.

Re: 5.25 floppies that read but don't write

Try swapping both a and b drives. Try with only 5 1/4" plugged in to a and then again to b. Makes a difference? Specify make and model of motherboard, drives. Describe cable. Describe ROM settings. Bill Degnan twitter: billdeg vintagecomputer.net I have connected a 1.2M 5.25" floppy to my