LWELCH@COLGATEU.BITNET (09/30/88)
Assuming I'm using GS/OS for everything, but I launch into ProDOS 8 applications as well as ProDOS 16 ones, which disks should I initialize as 4:1 and which as 2:1? How did the old ProDOS 16 initialize disks? I would guess that disks to be used by ProDOS 8 applications should be done as 4:1 and ProDOS 16 disks should be inited as 2:1 (with GS/OS) Is this correct? Chip LWELCH@COLGATEU.BITNET
keith@Apple.COM (Keith Rollin) (09/30/88)
In article <8809291720.aa01487@SMOKE.BRL.MIL> LWELCH@COLGATEU.BITNET writes: >Assuming I'm using GS/OS for everything, but I launch into ProDOS 8 applications >as well as ProDOS 16 ones, which disks should I initialize as 4:1 and which as >2:1? How did the old ProDOS 16 initialize disks? >I would guess that disks to be used by ProDOS 8 applications should be done >as 4:1 and ProDOS 16 disks should be inited as 2:1 (with GS/OS) Is this >correct? > This is correct, but only if you are using the platinum Apple 3.5" drives. These drives are able to take advantage of a special driver the GS/OS team created to get the best performance out of a 3.5 drive. However, the older UniDisk 3.5 drives have their I/O routines in ROM in the drive itself, which aren't as good or as fast as the one with GS/OS. Therefore, it can't read disks with the 2:1 interleave very well. By the way, the GS/OS team is very proud of the Apple 3.5" driver. After getting it to format a 3.5" disk in 34 seconds on the GS, they noticed that it takes the Macintosh Finder on a Mac II *35* seconds. However, I haven't tried this out to verify it; I'm afraid to... Keith Rollin amdahl\ Developer Technical Support pyramid!sun !apple!keith Apple Computer decwrl/ "You can do what you want to me, but leave my computer alone!"
mvs@meccsd.MECC.MN.ORG (Michael V. Stein) (10/01/88)
In article <8809291720.aa01487@SMOKE.BRL.MIL> LWELCH@COLGATEU.BITNET writes: >Assuming I'm using GS/OS for everything, but I launch into ProDOS 8 applications >as well as ProDOS 16 ones, which disks should I initialize as 4:1 and which as >2:1? How did the old ProDOS 16 initialize disks? ProDOS 16 formatted disks with an interleave of 4, although I think it could have worked with an interleave of 3. >I would guess that disks to be used by ProDOS 8 applications should be done >as 4:1 and ProDOS 16 disks should be inited as 2:1 (with GS/OS) Is this >correct? You might want to always use an interleave of 2 with ProDOS 8. Saving data to the disk will be slower, but loading will be faster. (Most uses of the machine will require much more "loading" of data than "saving.") If you happen to be using ProDOS 16, use an interleave of 4. If you are using the uni-disk, always use an interleave of 4. -- Michael V. Stein - Minnesota Educational Computing Corp. - Technical Services {bungia,uiucdcs,umn-cs}!meccts!mvs or mvs@mecc.MN.ORG
delaney@wnre.aecl.CDN (10/02/88)
>By the way, the GS/OS team is very proud of the Apple 3.5" driver. After >getting it to format a 3.5" disk in 34 seconds on the GS, they noticed that >it takes the Macintosh Finder on a Mac II *35* seconds. However, I haven't >tried this out to verify it; I'm afraid to... Come on Kieth give it a try after formatting 40 disks at 49 sec each last night I'm wishing I had that new driver. Grant
kamath@reed.UUCP (Sean Kamath) (10/03/88)
In article <18008@apple.Apple.COM> keith@apple.com.UUCP (Keith Rollin) writes: > >By the way, the GS/OS team is very proud of the Apple 3.5" driver. After >getting it to format a 3.5" disk in 34 seconds on the GS, they noticed that >it takes the Macintosh Finder on a Mac II *35* seconds. However, I haven't >tried this out to verify it; I'm afraid to... > >Keith Rollin pyramid!sun!apple!keith This is the kind of enthusiasm I like to hear about in the Apple // team. Squeeze out the best performance that you can, and be proud that you did. Tell them to keep up the good work, and pat them on the back. Sean Kamath -- UUCP: {decvax allegra ucbcad ucbvax hplabs ihnp4}!tektronix!reed!kamath CSNET: reed!kamath@Tektronix.CSNET || BITNET: kamath@reed.BITNET ARPA: kamath%reed.bitnet@cunyvm.cuny.edu US Snail: 3934 SE Boise, Portland, OR 97202-3126 (I hate 4 line .sigs!)