 | Author: | Jason Compton (guest: search) |
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| Date: | Mon, Jul 26th, 2010 @ 23:53 ( . ) |
Is it possible to rip 1571-formatted disks (on a 1571, of course)? I don't see anything in the docs about this and I'm reluctant to specify -E70 or whatever and have the heads jam themselves through the wall. I have what I'm pretty sure is a 1571-formatted disk (Clone Machine for 1571)--based on the large quantity of files and the "631 blocks free" reported in the directory listing, I'd say it's 1571 format.
I ripped it as s1/s2 as usual but if there's a better way, let me know. |
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 | Author: | Pete Rittwage (registered user: 558 posts ) |
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| Date: | Tue, Jul 27th, 2010 @ 08:29 ( . ) |
Nope, there is no way to do that currently, and it probably won't be added due to the very few disks out there that would benefit.
I should be able to reverse the bit stream on the ripped side two and possible stitch a working version. I assume that ripping to D71 didn't work due to protection? |
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| Author: | Jason Compton (guest: search) |
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| Date: | Tue, Jul 27th, 2010 @ 09:47 ( . ) |
On 07/27/2010 @ 08:29, Pete Rittwage wrote :
I assume that ripping to D71 didn't work due to protection?
Right, tried that. Anyway, it's in last night's pack, Clone Machine 1571. |
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 | Author: | J Achernar (registered user: 36 posts ) |
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| Date: | Wed, Jul 28th, 2010 @ 19:32 ( . ) |
I have two 1571 formatted copy protected disks, Sketch Pad 128 from Free Spirit Software and CADPAK 128 Mouse Version from Abacus. I don't care much about CADPAK 128 because I also have an original non copy protected version. I believe that Abacus sent it when I mailed in the registration card, probably for a small fee.
For Sketch Pad, if I image each side separately, and the bit order for side two is reversed, is it possible to convert it into a g64 format image that might work in WinVICE? I believe that the copy protection may be on side two because there is a bad sector on track 55. D71 images between the original and the backup copy that I had made back in the day are identical. |
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| Author: | Pete Rittwage (registered user: 558 posts ) |
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| Date: | Wed, Jul 28th, 2010 @ 19:41 ( . ) |
I'll have to write some custom routines to do this... Not only do I have to reverse the bit order, but also re-frame all the data to the reversed sync marks. |
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| Author: | Pete Rittwage (registered user: 558 posts ) |
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| Date: | Wed, Jul 28th, 2010 @ 19:51 ( . ) |
The other issue is that there is apparently no double-sided GCR image format- I can't find where there is any standard for a "G71" type image.
Therefore, there would be no way to emulators to handle it unless we added it... Ugh. |
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| Author: | J Achernar (registered user: 36 posts ) |
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| Date: | Wed, Jul 28th, 2010 @ 20:14 ( . ) |
I remember looking at the g64 file format a while back. It seems to be pretty generic. Could offset $0009 be set to $8C (140 in decimal) to simulate a 1571 format disk? |
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| Author: | Pete Rittwage (registered user: 558 posts ) |
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| Date: | Wed, Jul 28th, 2010 @ 20:16 ( . ) |
It's not a problem to make/modify a new file format, it's just that the emulators won't know what to do with it. :)
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| Author: | Jason Compton (guest: search) |
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| Date: | Thu, Jul 29th, 2010 @ 10:56 ( . ) |
The VICE guys seem pretty active these days--I imagine if you provide them with a spec and a real thing they'll adopt it readily enough. |
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 | Author: | Linards Ticmanis (guest: search) |
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| Date: | Sun, Aug 29th, 2010 @ 12:26 ( . ) |
You can't just read the back side of a double sided non-flippy disk by flipping the disk over, reading it and then and reversing the order of bits!!
The top head and the bottom head of a two sided floppy drive aren't actually directly opposed to each other (because if they were, the two read/write heads would interfere with each other). Because of this, track 0 on the back side of the disk (physically the back side is the top side of course) is, if I remember correctly, 4 tracks further out from the center than you can seek the lower head. So unless you mod your drive or there happens to be no needed data on the 4 outermost tracks of the back side of the disk, no chance. |
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| Author: | Pete Rittwage (registered user: 558 posts ) |
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| Date: | Sun, Aug 29th, 2010 @ 18:49 ( . ) |
Yes, that is well known. I was mistaken about reversing the bit order in this conversation, anyway. That would only be needed if we were trying to read a "backwards" 1541 disk side from head 2 of the 1571. That's not the case here. |
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| Author: | Linards Ticmanis (guest: search) |
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| Date: | Mon, Aug 30th, 2010 @ 04:42 ( . ) |
Hello Pete, I assumed that you know it, I was more or less just blurting off my great know-it-all-ness to the other readers of this thread.
I'm sorry if I happened to offend you, but I hope I didn't!
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 | Author: | bluebirdpod (registered user: 28 posts ) |
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| Date: | Mon, Aug 30th, 2010 @ 09:14 ( . ) |
Well Since I posted this first original post over 4 years ago. I emailed Womo all the info I had on the 1571 I have in my collection with a speed control added. Its a very simple install, two wires, and a pot and resistor. Email me at
my yahoo.com account, with the above user name. I will email you the photos and info. I purchased this drive from a technicial who worked at Beckman. He had cloned a Supercardplus into this same drive along with a Burstnibbler cable. I am in the process, uhhh, very slow process of disassembling a 1541-2 with the direct drive mech and attempting to integrate the same hack, although it will require very small wires between the pcb and flywheel. Not there yet. |
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| Author: | bluebirdpod (registered user: 28 posts ) |
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| Date: | Mon, Aug 30th, 2010 @ 09:19 ( . ) |
hrmph!, what happened I thought I was reading the post below when I replied. Wrong topic sorry folks. Look for 1571 Speed Adjustment. |
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| Author: | Pete Rittwage (registered user: 558 posts ) |
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| Date: | Mon, Aug 30th, 2010 @ 09:35 ( . ) |
Not at all!
My explanation was actually mixed up in the thread anyway. He asked about double-sided 1571 disks and I answered about flippy disks. :)
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