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question about diskettes for use with the TI 99 4A


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#1 digdugnate ONLINE  

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Posted Tue Apr 18, 2017 6:28 PM

I was doing some research today about diskettes and the TI; I think it'd be neat to have 5 or so blank disks to save TI EB programs on or just generally have on hand to mess with.

 

Can someone confirm these are the specs for the disks?

 

Diskette type: SA 104 (ANSI standard 5.25") -- Single side, single density
Encoding method: FM single density
Capacity: 92l6O Bytes per disc
2304 Bytes per track
256 Bytes per sector
40 Tracks per side
9 Sectors per track
 
If so- where in the world would someone even get disks that still meet this format?
 
Thanks!
 


#2 schmitzi OFFLINE  

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Posted Tue Apr 18, 2017 6:42 PM

I use plain 40 tracks, soft-sectored, double-density disks with the SD-controller.

Only HD does not work, I think



#3 Ksarul OFFLINE  

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Posted Tue Apr 18, 2017 6:45 PM

Any 5.25 disk that identifies itself as DSDD (double sided, double density) with soft sectors meets the requirement. Note that the soft sector requirement is just as important as the DSDD identifier, as some of the disks back then used something called hard sectors. A hard sector disk has one index hole per formatted sector on a track, while a soft sector disk has just one index hole--period. Avoid disks with an HD identifier like the plague. . .

 

The DSDD disks will also often be identified as 360K disks. That's what you want, as a 360K soft sector disk can be formatted to any of the formats the TI uses (SSSD, SSDD, DSSD, and DSDD). Soft sector disks are generalists. . .



#4 Sinphaltimus OFFLINE  

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Posted Tue Apr 18, 2017 6:49 PM

Here's some I found on ebay - As Ksarul said - Soft Sectored Double Sided Double Density.

http://www.ebay.com/...60AAOSw4CFY8AIQ



#5 mister35mm OFFLINE  

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Posted Tue Apr 18, 2017 7:21 PM

I prefer

 

http://www.ebay.com/...25/222446443746

 

and avoid stuff in poor condition, like this:-

http://www.ebay.com/...t-NOS/302270080

 

Stephen in London UK

 

Still looking for a PEB....



#6 digdugnate ONLINE  

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Posted Tue Apr 18, 2017 7:25 PM

Sweet. Thank you everyone as always.

#7 PeBo OFFLINE  

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Posted Tue Apr 18, 2017 7:39 PM

I wouldn't lock myself to SSSD disks, since you never know when a DSDD disk controller might cross your path (and if you ever decide to go the route of an HxC drive emulator, a disk controller upgrade should probably be on your wish list.

 

Get DSDD disks now! Sure, you'll only be able to format them SD with a stock TI controller, but you can always write to both sides by flipping over the disk, so no waste there. At least that way, when you're ready to go from 90K to 360K you'll already have a bunch of disks ready to re-format and fill.



#8 --- Ω --- OFFLINE  

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Posted Tue Apr 18, 2017 8:02 PM

 

 

Still looking for a PEB....

 

Damn, too bad you'll not be at Fest West.  I have a spare P-Box that I'll probably never use, I could bring it.  I just have no interest in boxing things up for shipping to the UK... or anywhere else for that matter.



#9 Opry99er OFFLINE  

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Posted Tue Apr 18, 2017 9:00 PM

As stated above... soft sectored is the key. DSDD, DSSD, whatever you find. The most common 5.25 disk to find these days is DSDD, and it will work perfectly fine.

#10 arcadeshopper OFFLINE  

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Posted Tue Apr 18, 2017 10:40 PM

 
Damn, too bad you'll not be at Fest West.  I have a spare P-Box that I'll probably never use, I could bring it.  I just have no interest in boxing things up for shipping to the UK... or anywhere else for that matter.

Worst case I'll take it :)

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#11 --- Ω --- OFFLINE  

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Posted Tue Apr 18, 2017 10:56 PM

Worst case I'll take it :)
 

 

Without even asking the price?  That's bold, not to mention trusting.  :)



#12 arcadeshopper OFFLINE  

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Posted Tue Apr 18, 2017 10:57 PM

Take implies your generosity of course :)

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#13 --- Ω --- OFFLINE  

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Posted Tue Apr 18, 2017 11:02 PM

Sorry, I can't do free on a P-Box.  It is like new, but it's only 32K with a TI-FDC and an original 90K SSSD drive.  One modification has been performed on it though.  A whisper quiet fan was installed.



#14 Opry99er OFFLINE  

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Posted Wed Apr 19, 2017 12:16 AM

I'll take one, since you're giving PEBs away for free..

#15 Sinphaltimus OFFLINE  

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Posted Wed Apr 19, 2017 3:35 AM

Free PEBs at FestWest?!?! WHOOHOOO!

Thanks Omega!

;)

Lol.

#16 digdugnate ONLINE  

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Posted Wed Apr 19, 2017 4:24 AM

it's funny you mention the fan thing because that's the first thing my son commented on last night when i fired my new PEB up.

 

'That fan is really loud, dad'

 

'Quiet, son, it's amazing'



#17 --- Ω --- OFFLINE  

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Posted Wed Apr 19, 2017 9:27 AM

it's funny you mention the fan thing because that's the first thing my son commented on last night when i fired my new PEB up.

 

'That fan is really loud, dad'

 

'Quiet, son, it's amazing'

 

If you ever feel like swapping out the fan on your P-Box << CLICK HERE >> for my blog entry on it.  

Now that I think about it, the extra P-Box I want to get rid of is the one in this blog entry.






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