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- DiskSpareDevice 2.2
-
- written and (c) 1992-1994
- by Klaus Deppisch
- All rights reserved
-
- What is diskspare.device:
-
- It is a completion or replacement of the trackdisk.device,
- which lets you format your disks with 960 kB or 984 kB, or if
- you've got a (trackdisk-compatible!) HD-Drive with 1920 kB
- or 1968 kB !!!
-
- How could this be:
-
- I've changed the track-construction a little bit. In detail I
- left out the (unused) sector-headers and read/write some
- bytes more than the trackdisk.device.
- The result: I can read/write 12 sectors/track (HD: 24)!
-
- By the way, ALL the drives I tested were able to read/write
- more than 12 sectors (at least 12.4 sectors but unfortunately
- no 25 sectors in HD-Mode).
- -> There should be no problems.
-
- The device is able to read/write 12*160*512 = 983040 Bytes.
- Or (new for v1.6) 12*164*512 = 1007616 Bytes (984K)
- Or (new for v2.0) 24*160*512 = 1966080 Bytes (1920K)
- or 24*164*512 = 2015232 Bytes (1968K)
-
- The HD-Mode is compatible to my 'highdensity.device' which
- is now dead.
-
- The device can be used now with the ProfFilesystem of Michiel Pelt.
- Please don NOT use the version 2.0 of the device. The motor of the
- drive stays on all the time AND version 2.0 may cause read/write
- errors. There are Mountfiles (for WB 2.1/3.0 only) in the DD and HD
- drawer called PS0 and PS1. (Names (PSx) are from Brett Simcock)
-
- When you mount the device you can use it like any other disk
- or partition. That means you can access it with your favourite
- dir-util, format, diskcopy or whatever you want to do with it.
-
- What do you need:
-
- - Kickstart 2.0 or higher (NO WAY to get it run < KS 2.0 !)
- - diskspare.device (here it is)
- - mountlist-entry (included)
- - a floppy-drive (you should have one)
- - an Amiga (hmm..)
-
- What to do:
-
- - read this doc-file (the WHOLE crap !!!)
- - copy the file 'diskspare.device' into your DEVS: directory.
- - append the file 'Mountlist' to your Mountlist (to be found
- in your DEVS: directory).
- - insert the lines 'mount DS0:' and 'addbuffers DS0: >NIL:'
- (or DS1-3) into your 'User-Startup' (can be found in S:)
- - OR if you're using WB 2.1/3.0 copy the File(s) DS0-DS3 into
- your DEVS:DosDrivers directory.
- - OR use the included install sripts (new for v2.0).
- - reboot your Amiga
-
- The line 'addbuffers DSX: >NIL:' is necessary to make the
- device 'visible'. It's better to use this than to modify
- the mountlist with 'Mount = 1' because then you'll get a
- 'no disk'-requester when mounting. (only for WB2.0)
- For Workbench 2.1 and above you can use the 'Mount = 1'.
-
- NOTE:
- If you don't use the 'addbuffers' or 'mount = 1' the device
- won't be mounted correctly until you access it. That will
- cause some programs to crash !! That's another oddity of the
- workbench! See 'LoadWB' below.
-
- For a quick test simply doubleclick the QuickTest Icon.
- Please note: You won't get a Disk Icon for unformatted Disk on
- the Workbench (the same for all devices you mount after LoadWB).
- So you need the Shell to format the disk the first time.
- (format drive DS0: name Test)
-
- Examples:
-
- 1. You've got two drives and want to use 'DF1' as 'DS1'.
- You've copied the file 'diskspare.device' and appended 'Mountlist'
- to your Mountlist (do *** NOT *** simply COPY it to devs: or your
- personal Mountlist will be LOST !!!).
-
- To test whether it works (or not) open a Shellwindow and type
- 'mount DS1: <return>' then 'dir DS1: <return>'. You should
- see a requester now 'No disk present in device DS1', cancel it.
- Insert a blank (or empty) disk into your drive and type:
- 'format drive DS1: name test noicons<return>'.
- The disk should be formatted like any other disk. After format
- type 'info <return>' you should find a line like this:
- 'DS1: 983K 1966 2 0% 0 Read/Write test'
- this means that everything works fine and you're able
- to use this disk like any other disk.
-
- 2. If you've only got one drive and want to use it as 'DS0'.
- You've copied the file 'diskspare.device' and appended 'Mountlist'
- to your Mountlist (do *** NOT *** simply COPY it to devs: or your
- personal Mountlist will be LOST !!!).
-
- Follow the test-procedure as above.
- After 'info' you should see a line like this:
- 'DS0: 983K 1966 2 0% 0 Read/Write test'.
-
- 3. You're the proud owner of an Amiga 4000 and want to use your
- internal 'DF0:' as DS0:. You only have to copy the file
- 'diskspare.device' to DEVS: and the Mountlist-File from the
- 'HD'-Drawer (!) into your 'Devs:DOSDrivers' Drawer.
-
-
- What problems could arise ?
-
- - If you modify the icons for WB 2.1/3.0, check if they
- have the right unit-number (use information from the
- icons-menu). (There needn't be a number in the icon.
- I forgot to remove it in the first release...)
- - Mount returns an error: 'Entry not found' -> check if you
- really appended the mountlist and typed the right name
- - dir returns an error: 'device or directory not mounted' ->
- did you copy the device to devs: or did you try to access
- an invalid drive (if you've got df0: and df1: you can't
- mount ds2:. It's logical, or what !!!)
- - format returns: 'no disk inserted' -> you must wait a
- few seconds after inserting a disk (trackdisk must access
- the disk first)
- - format returns: 'format failed try another disk' -> do so
- - format returns always the above -> it looks like you've
- got a drive that doesn't work -> try another drive or
- curse me and delete all 'diskspare-files'.
-
-
- NOTES:
-
- -This is NO easy using program! That means, You should know
- what you're doing.
- If you don't know how to use the Shell and how to edit a mountlist
- and user-startup read the manual that came with your machine!
- Or ask a friend to help you.
- Or use the included install scripts.
-
- -If you mount the device after 'LoadWB' there will be no Icons
- for unformatted disks or during format,diskcopy etc. that say
- 'DSX:BAD' or 'DSX:BUSY'.
- This isn't a bug of my device but an oddity of the Workbench.
- (It's the same if you mount RAD: or any other device AFTER
- 'LoadWB').
-
- -If you use the device for 984K disks NOTE that it IS a HACK!
- Normally you CAN'T read/write Cyl. 80/81 via trackdisk.device.
- It's only possible due to a PATCH of a PRIVATE device.structure!
- I tried to make it as safe as possible and it works fine with
- KS2.0/KS3.0 but there's NO GUARANTEE that it will work with
- future releases. (Until I fix it).
-
- -The Autoswitch DD<->HD is only possible due to a PATCH of a PRIVATE
- structure in the FFS. The second nasty hack! (I hope the last one)
- It's necessary because the FFS allows only the trackdisk.device
- to change the capacity during operation. If the devicename isn't
- 'trackdisk.device' it NEVER calls GETGEOMETRY.
- p.s. Works fine with KS2.0/KS3.0
-
- -It might be possible that there are drives which can't
- read/write up to Cyl.81 (I've never seen one).
-
- -It's currently impossible to mount two drives on the same unit.
- With the FastFilesystem only. If you use another filesystem, which
- uses AddChangeInt instead of Remove (e.g. ProfFileSystem) you may
- mount more than two drives.
-
- Bonus:
-
- If you use diskspare.device you won't have any problems with
- bootblock-viruses because they try to write single sectors via
- trackdisk.device. Trackdisk can't read the track so it can't
- write single sectors!
- If there should be a virus which is able to write itself to
- the first blocks of a diskspare-disk then this will be it's
- last activity because the device can't be made resident ->
- you can't boot from this disk -> the virus won't be executed!
- Note:
- The Install command checks for trackdisk.- and carddisk.device.
- So you can't install ANY other disks.
-
-
- Some details:
-
- 1. Safety:
- I've tested the device since Dec. 1992 on different Amigas
- (A500-A4000) and I've copied (nearly) all my disks to diskspare-
- format. I use the cheapest No-Name-Disks and there weren't any
- problems (yet).
- All updates and enchantments made, concerning the
- device-routines and not the track-construction.
-
- The only problem could be the floppy-drive. There're so many
- different types (I've got 6 drives of 4 different manufacturers)
- that it might be possible that one of them doesn't work.
-
- 2. Speed:
- Diskspare.device is about 5%-15% faster than the trackdisk.device
- (68000 5%, 68020 10%, 68030 15%)
- example: (A2000 with A2630/25MHz/2Meg)
- kB sec speed
-
- format 984 81 -> 12.1 kB/s
- 880 83 -> 10.6 kB/s
-
- 4. Mountlist:
-
- Flags:
-
- Bit 0: (1) 0 = Diskchange works only on DSX: (X = 0-3)
- (you have to do a diskchange for DFX by
- hand e.g. 'diskchange df0').
- 1 = Diskchange works on DSX: AND DFX:.
- (like CrossDOS).
- Bit 1: (2) 0 = use only Cyl. 0 to 79 (like trackdisk does)
- 1 = allow the device to use also Cyl. 80 and 81
- You must ALSO change HighCyl to 81 or
- nothing will happen.
- Bit 2: (4) 0 = no HD mode allowed
- 1 = enables the device to use HD-Disks too.
- (works LOGICALLY only with HD-Drives!)
- Bit 3: (8) 0 = use any mem for the trackbuffer
- 1 = use mem from $600000 to $A00000 (4M) If the
- allocation failed, any mem will be used. This
- may be useful for A2630 or A3/4000 owners who
- have got a 16Bit Ramcard.
-
- ALL other values are reserved.
-
- These flags may be different for each drive.
-
- For changing the flags you have to add the values in brackets behind
- the bitnumbers. e.g. You wish to use bit 1 + 2 (HD with 82 Cyls). So
- you need to add 2 + 4 = 6 = value for the flags.
-
- You may change BlockSize, BlocksPerTrack and Sectors/Block but
- note that a file of even 1 (ONE) Byte length needs 2 blocks
- (FileHeaderBlock & DataBlock). -> if you use big blocks you
- waste A LOT OF disk-space!
- If the HD-Flag is set, you can't change the values for Sectors,
- BlockSize, BlocksPerTrack... They will be overwritten the first
- time a disk is inserted!
-
- BE CAREFUL:
- The entry 'Reserved' MUST BE '2' !!! It cost me a lot of time
- and nerves because I set it to '0' to get 1K more capacity.
- The only thing I got was curious error-messages! That's
- obviously a bug in the fastfilesystem.
-
- If you want to waste a lot of speed and capacity you may set
- the 'Buffers < 25' and 'DosType = 0x444f5300'. A good value
- for Buffers is 50 (also for DFx:).
-
- 5. HD-Mode:
- With Bit 2 (Flags in Mountlist) set, the device is enabled to
- use HD-Drives. It works a little bit differently from the
- trackdisk.device. Trackdisk allocates and frees the memory
- for the dmabuffers according to the disk capacity. I don't
- do so, because if the chipmem is very fragmented or simply
- not enough of it left, it could be possible that the allocation
- failed -> No HD-mode possible. So I allocate the buffers when
- opening the device and keep them until close. -> Make sure the
- FIRST 'OpenDevice' to a HD-Floppy is made with Bit 2 SET or
- the HD-Mode won't work!
-
- 6. Copying normal disks to diskspare format:
- You may wish to copy some data from normal (837K) disks to
- diskspare disks (984K) to get some free disks. (You need 8
- d.s. disks for 9 normal disks).
- The fastest possibility is to mount a RAD: which has the same
- size as a diskspare disk. I've included a sample mountfile
- for 984K (called RDD) and for 1968K (called RHD).
- Now you can copy the files from your normal disks to the RAD
- (RDD or RHD) and then 'diskcopy' it to DSX.
-
- VERSIONS:
- 1.6 first public release
- using 'highdensity.device' for HD mode
-
- 2.0 now includes HD mode
-
- 2.1 better errorchecking:
- - checks now both for trackdisk and ms-dos format before
- a track is reread !
- - the device does now more retries before an error is
- returned. Do NOT use this to use Disks which can hardly
- be formatted. Such Disks are RUBBISH !!!
- some bugfixes
-
- Because of a misunderstanding with a friend, there was a misrelease
- of the version 2.1. If you find a file 'DiskSpII.lha' please delete
- it immediately! The device itself is (nearly) ok, but the docs don't
- fit to it.
-
- 2.2 some bugfixes again
-
-
- IMPORTANT:
- The device is FreeWare. You may use it with your own
- projects until this doc.file and the Mountlist.files are
- distributed with it. You may also use it for commercial
- programs if you say CLEARLY that this device is FREEWARE!
- You MUSTN'T modify the device itself or this doc.file or
- the MountList.files. Only exception is a translation of
- this file. If you need a modified/enchanted version
- please contact me.
-
- This disk-format MUSTN'T be used for stupid NDOS-Games !!!
-
- MOST IMPORTANT:
- You use the above described software at your OWN RISK.
-
- Under NO CIRCUMSTANCES will the author be liable for any
- direct or indirect damage or data loss resulting from
- the use or misuse of this software or the documents.
-
- All rights are reserved by the author.
- Suggestions and (detailed) bug-reports are welcome.
-
- Author:
- Klaus Deppisch
- Beckenwengert 3
- 97246 Eibelstadt
- Germany
-
- Phone: 09303 1579
-
-