DOS 3.2

11 posts / 0 new
Last post
Offline
Last seen: 2 days 16 hours ago
Joined: Apr 23 2022 - 18:41
Posts: 23
DOS 3.2

I just finished ironing the bugs out of my Rev0 project and I’d like to get a copy of DOS 3.2. I’m running 3.3 but I’d just like to get a copy of 3.2.  All the images I’ve found are in a .d13 extension. I’m presuming this is 13 sector. Does anyone know where or even if I can find a dsk image of 3.2 that I can write with adtpro in a 16 sector drive? I haven’t tried but I don’t believe adtpro supports .d13 extensions. 

Thanks group

 

Offline
Last seen: 4 hours 49 min ago
Joined: Aug 4 2015 - 14:30
Posts: 129
ADTPro only supports 16 sector disks

How to make a 13 sector boot disk, se this thread:

https://www.applefritter.com/content/quick-disk-ii-1316-sector-question

 

Important:

In order to actually use/boot a DOS3.2 disk, you need to have a 13 sector disk controller card.

Without a 13 sector disk controller card you won't be able boot from the DOS3.2 disk and get DOS3.2 into memory.

Offline
Last seen: 2 days 16 hours ago
Joined: Apr 23 2022 - 18:41
Posts: 23
Thank you for the reply. So

Thank you for the reply. So without a 13 sector controller card and 13 sector drive I won’t be able to use 3.2. Not the end of the world, I just thought it could be done simpler than that. I’ll just stay with 3.3 I guess. 

Offline
Last seen: 4 hours 49 min ago
Joined: Aug 4 2015 - 14:30
Posts: 129
It's only the 13 sector disk controller card you need

It's only the disk controller card that is different.

And it's actually the P5 and P6 prom on the card that is different. And it's the P5 prom that really matters.

So if you could get hold of a 13 sector P5 and P6 prom (part no. 341-0009 and 341-0010) you can put it on your existing disk controller card and it should work as a 13 sector disk controller card.

And it is actually only the P5 prom that is needed to be changed.

I think I read somewhere that the P6 is more or less the same for 13 and 16 sector.

Take this with a grain of salt, as I have never tried this.

Please note that I'm not sure if it's the P5 or P6 that is the boot loader prom, but it's the boot loader prom that is important (I could probably google it but I'm lazy).

 

But one thing is certain: the drive itself is the same for 13 and 16 sector disks.

Online
Last seen: 5 min 9 sec ago
Joined: Jun 6 2020 - 10:50
Posts: 254
I believe 4am's Anti-M

I believe 4am's Anti-M utility will allow you to boot a 13 sector floppy or image on a 16 sector controller. I don't know if it will help you write out a 13 sector image to a disk. But should allow you to boot them. I believe it somehow patches the PROM in memory. 

Offline
Last seen: 4 hours 49 min ago
Joined: Aug 4 2015 - 14:30
Posts: 129
4am Anti-M

Tanks Nick. I didn't know about 4am's Anti-M. I will have to try it out.

 

Offline
Last seen: 3 days 23 hours ago
Joined: Jun 18 2010 - 13:54
Posts: 508
There's also DoubleDOS (aka

There's also DoubleDOS (aka DubbleDOS) that will boot and work with both 13-sector and 16-sector disks. The software product, not the hardware board that switches PROMs. Just boot the disk; no hardware changes or requirements. Automatically switches between formats as necessary (with a simple "beep" to let you it switched!)

S.Elliott's picture
Online
Last seen: 15 min 21 sec ago
Joined: Jun 23 2022 - 16:26
Posts: 6
 Please note that I'm not

 

Please note that I'm not sure if it's the P5 or P6 that is the boot loader prom, but it's the boot loader prom that is important (I could probably google it but I'm lazy).

Correct.  Apple modified both ROMs for 16-sectors, but the boot ROM is the one that enables you to boot 13-sector vs. 16-sector disks.  The sequencer ROM contains a bug-fix that was necessary to read 16-sector disks; there's no benefit in reverting to the original (buggy) sequencer ROM.

 

James Sather explains the disk controller and all the differences between implementations for DOS 3.2 (13-sector) and DOS 3.3 (16-sector) in Chapter 9 of his book Understanding The Apple II.  Archive.org has that whole book online for free reading at https://archive.org/details/understanding_the_apple_ii/page/n229/mode/2up?view=theater

 

If you want to switch freely between booting 13-sector vs 16-sector disks, hunt down a MicroSci A2 disk controller.  It can boot from either format just by moving a jumper:

 

QFT (quoted for truth):

But one thing is certain: the drive itself is the same for 13 and 16 sector disks.

Offline
Last seen: 4 hours 49 min ago
Joined: Aug 4 2015 - 14:30
Posts: 129
Franklin Computer Disk Interface Card

I happened to get a Franklin Computer Disk Interface Card which also have jumpers for 13 and 16 sectors.

See https://www.applefritter.com/content/franklin-computer-disk-interface-card

 

Offline
Last seen: 2 days 16 hours ago
Joined: Apr 23 2022 - 18:41
Posts: 23
Thanks everyone for all that.

Thanks everyone for all that. Sounds like I have a few options. I’ll research a few of them. 

Online
Last seen: 17 min 16 sec ago
Joined: Jul 5 2018 - 09:44
Posts: 951
tolderlund wrote:I happened
tolderlund wrote:

I happened to get a Franklin Computer Disk Interface Card which also have jumpers for 13 and 16 sectors.

See https://www.applefritter.com/content/franklin-computer-disk-interface-card

 

I've been told that the Franklin card design was licensed from MicroSci.

 

I remember using BOOT 13 from either the DOS 3.3 System Master or DOS 3.3 BASICs disk...  I don't remmeber which.  But it would let you boot up a 13 sector disk even if you had the 16 sector P5 and P6 PROMs on your Disk ][ Controller card if I remember right.

 

Googling it produced this link which is interesting...

 

 

https://llx.com/Neil/a2/better.boot13.html

 

 

 

Log in or register to post comments