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2006-10-19
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******************************************************************************
* File: HISTORY
* Purpose: To record MDOS changes for future reference
* Started: May 04, 1996 by Tim Tesch
*
*
* DATE PROBLEM/SOLUTION
*------------------------------------------------------------------------------
* 04/28/96 Jeff White fixed the Genmod compatibility problem between the
* Genmod Geneves and the SCSI cards, MDOS v3.00 Bravo is born.
*
* 05/04/96 Tim Tesch revised the new Genmod compatible source code to
* bring it up to the level of MDOS 4.00
*
* - L6\KEY2S Keyscan reset code now works with all PFM devices
* - HEAD\TASKHEADS removed 3 nodes from the environment linked-list
* to make up for the SCSx devices Mike added. This fixes the
* problem 2.50S had mostly with PFM/Flashdisk devices hanging.
* Why? MDOS uses the linked list to keep track of space. When
* Mike added the scsi devices he pushed the list past >0400,
* removing the NULL pointer required to signify the end of the list.
*
* 05/07/96 - L6\WRITETTY CLI\NEWCMDS CLI\HCLIS
* Added code to toggle Psystem video for TTYOUT.
* PSYS OFF is standard mdos, PSYS ON is used for Psystem
* Jerry Coffey tested these changes and has stated that psystem
* now works properly
* - L8\SECT2-P, Added remap/sector-access code for PFM Flashdisk
* Made sure NULLP saw >0000, not >FF00
*
* 05/08/96 - L7\MANAGE2S L7\MANAGE2T
* Modified memory count in 3 places to reflect FAST ram at
* pages >C0 thru >EF, the location of Cecure's 384K memory
* upgrade.
*
* 05/24/96 l7\MANAGE2S
* *->Disabled memory power up from adding pages B9,BD,BE,BF for
* ver5.00 | use with Rave Ram card as device H.
* |
* 05/26/96 | cli\chkdsks
* | Received update to this file from Jeff White. Fixed size
* | reporting for drives >90Mb and improved comments in source file.
* |
* 06/02/96 | l7\manage2s
* | Decided that blocking B9,BD,BE,BF should not be done for Memex.
* | Added routine to check for Rave card at CRU >1700 - if present,
* | the four pages are blocked during powerup. If Rave is not
* | present at >1700, the pages are not blocked.
* |
* |ERROR: The system page used for these routines was almost full;
* | adding the Rave routine pushed it past 8K. So, I removed
* *----> the test. Rave use is now determined by a flag. To
* activate the Rave, you must SECTOR EDIT MDOS.
*
* 1) Search for HEX string >9640
* 2) replace with >0000 for Rave use
*
*
* 06/02/96 \HEAD\OSHEAD1S
* Located two areas which permanently declare pages for SCSI use.
* Must modify these areas if we want to make those pages free
* whenever a SCSI card is not present.
*
* 06/30/96 Modified GPL, included ROMPAGE support from menu
*
* 07/02/96 \CLI\NEWCMDS
* Added routines for REMAP and SETDSK to show the current settings.
* Until now, there was no way of knowing what each drive was remapped
* to or setdsk'd to.
*
* 07/04/96 Dan Eicher had mentioned that Port's MDOS Shell did not work
* with MDOS 5.00, so today was debug day. MDOS 2.21, 2.50 and 4.00
* worked, so I knew it was in the code changes between 4.00 and 5.00.
* I forced a full assemble - no change. I removed all remap/setdsk
* changes from NEWCMDS - no change. Finally I went into my Shell
* code where I found it had something to do with the keyboard
* routine. Hmm... my routine, like others, was looking at hard-coded
* values for the keyboard buffer. After staring at that code, went
* into L6\XOPS-S where the PSYSTEM flag was added. Sure enough, my
* strategic placement had backfired... once I removed the psystem
* flag, all worked as it should.
*
* - 'tis time to fix the psystem flag...DONE. Moved to offset >2200
* in KEY1S.
*
* - \CLI\COPYS
* Fixed problem with COPY CON. Create/update dates are now
* written out to the file properly.
*
* - \HD\WINDS3-S
* Fixed problem with SAVing files. Before, saving a file over an
* existing file would blast the create date. Now the creation
* date is preserved. Must check whether it is preserved when
* a file of a different type (ie, df80 over program) is written.
*
* TESTED - date is preserved, even when different file type is
* used. I will not change this..
*
* 7/5/96 \L8\SECT-P and L8\RW-P2
* Cleaned up a few routines, in particular the floppy controller
* sector IO routines. Verified that the CALL DIR loop worked
* properly. More debugging to do to get CALL DIR() to work from
* HFDC floppies / emulate files.
*
* 7/7/96 \L8\SECT-P
* After TWO days of searching I finally tracked down a long-present
* DSR bug. This bug caused the CALL DIR() to lock up whenever it
* was used with an emulate file or a HFDC floppy.
*
* In the process of debugging, I learned that the CALL DIR code
* is located in two areas, one for all floppy support, the other
* for HFDC. The HFDC CALL DIR code is not used but could be added
* at a later date. Directorys are not display, but that too could
* be added later.
*
* The final solution was to save and restore the MDOS pages before
* and after the disk access was performed. I believe this may
* eliminate some of the "sporadic" HFDC operation, at least under
* ****** GPL mode. The next step is to LOOK AT THE OTHER HFDC FLOPPY SECTOR
* ***!!*** ROUTINES to make sure they too are saving/restoring the correct
* ****** memory pages.
*
* 7/7/96 Further checking in this file shows that the HFDC Floppy sector
* WRITE routine MAY NOT BE CHECKING FOR ERRORS properly.
*
* - \CLI\DISKCOMP
* Bad sectors on source/target disks caused this routine to
* increment the TOTAL number of sectors by one for each bad sector,
* thereby causing the routine to loop indefinitely (verified w/2.21)
*
* The bug has been removed. Bad sectors may or may not show up
* in the compare. Why? The buffer used to load the sectors into
* memory is not cleared prior to the compare, so comparing a 360
* sector disk twice may give different results. If room can be
* spared, a routine to clear the memory will be added. I see this
* as an inconvenience, not a bug...
*
* - \CLI\DISKCOPY
* Bad sectors caused the DISKCOPY command to fail similarly to the
* way DISKCOMP failed (verified w/2.21)
*
* The bugs have been removed, and this command will copy disks
* properly. Bad sectors are skipped on the source. The bad sectors
* not read on the source are written to the target as whatever
* was in memory at the time.
*
* Errors on the target diskette will cause the DISKCOPY to skip that
* particular sector. This means that the info did not copy
* correctly, and it is time to (a)reformat the target disk or
* (b) throw the target disk away and get a new disk!
*
* - \CLI\CHKDSKS
* (Use of "CHKDSK /F")
* Uncommented the routine which writes sector 0 back to disk if
* errors are encountered. As of MDOS 2.21, errors were reported
* to the user on the screen but were never fixed!!!!!!!!
*
* In the event that sector 0 is garbaged, the disk is write protected,
* or the disk is removed, CHKDSK will tell you it could not write
* the modified sector zero back to disk.
*
* (Usage of "CHKDSK *")
* It was either Bill Sullivan or Bud Mills who told me about this
* use of CHKDSK. It checks the directory/disk and tells you which
* files, if any, are fractured.
*
* The routine ONLY WORKS ON FLOPPIES. The code used to catalog the
* disk is the same that finds the fractured files, and it is not
* sophisticated enough to detect hard drive fractured files.
*
* Therefore, if you get "All specified files are contiguous" on
* a hard drive device, take the message with a grain of salt!
*
* 07/08/96 \CLI\TREES and \CLI\GETCATS
* Modified GETCATS so that it would report whether floppy directories
* existed on the cataloged floppy. The TREE code uses relative
* record access which does not catalog floppy directories, so my
* fix did not work. To make TREE catalog floppies, I have to add
* more code to the TREE routine. Since MDOS has less than 1K
* (1024 bytes) of room left in this area I cannot justify it at this
* time.
*
* - Looked through the HFDC FLOPPY Format code some more. Still am unabe
* to get the format to work, with the HFDC, under GPL. I have not
* tried removing the Myarc Floppy Controller and setting the HFDC
* to >1100. Perhaps this has something to do with Jeff/Dan's
* assertion that both cards are turned on during the HFDC Floppy
* format process.
*
* 07/09/96 \L6\KEY2S
* Checked for keyboard filter...found out it was not present, so
* added it back in. Keyboard code now compatible with GPL and
* EXEC (all filter the same way).
* Last Modification for MDOS 5.00 release
*
*******************************************************************************
* 07/30/96 \L8\SECT2-P
* Removed code for Rave RAMdisk to switch banks to bank 0 before
* shutting off card. Caused Flakey access. Don Walden alerted me
* to this; we temporarily NOP'd the two lines (02030100....)
*
* 02/07/97 \SCSI\SECTOR_S
* Added SCSI ID "remap" table. Now able to assign SCSI ID #s to
* SCS1, SCS2, and SCS3. Have made no effort (yet) to add support
* for SCS4...SCS7 nor has a "remap" style command been added to
* MDOS. Sector editing is the only way to change the ID's for now.
*
* 12/30/97 \SCSI
* Cleaned up SCSI directory. Removed COPY directives from SECTOR_S
* and made one file, SCSI_S, for the copy. Cleaned up unused
* code; reassembled and tested.
*
* 12/30/97 \L8\DSRPASS-S and HDR2-P2, HDR1-P2
* Removed code specific to powering up the Winchester.
* Next step... try to remove pass-throughs for same card
* 12/31/97 Passthrough=s removed.
*
* 01/01/98 \CLI\NEWCMDS
* Modified SETDSK/REMAP text, lengthened SETDSK text...
* \L8\SECT2-P
* Modified Flashdisk code to support PFM512
* \L6\KEY2S
* PFM512 modifications
*
* 03/21/98 \CLI\NEWCMDS, \CLI\HCLIS, \SCSI\SECTOR_S
* Added new command: SCSMAP. Allows customization of SCSx devices
* so any ID from 0-6 can be assigned to any SCSx device.
* Moved SCSI Remap table to offset >040A for future reference
*
* \CLI\HCLIS
* Removed reference to "TI" command for WDS emulation as part of
* ongoing process of removing WDS support. Will eliminate actual
* command later
*
* 03/22/98 \CLI\NEWCMDS
* Modified HARD ON/OFF command to show actual status
*
* 03/22/98 \CLI\NEWCMDS, \CLI\HCLIS, L6\XOPS-S, \L6\VX282AS
* IBMGRF: Modifies location >2022 in L6\XOPS-S
* 127*8 = normal character set
* 255*8 = extended character set; used PORT's 128-255
*
* Needed because programs like Directory Manager don't redefine
* their graphics set properly.
*
* VX282AS was modified to use the location instead of equates,
* allowing self-modification by the CLI.
*
* 05/01/98 \CLI\DIRS
* Modified DIR command; now displays full 4-digit year. Investigated
* date and time routines and have determined that adding the "19"
* or "20" prefix would likely break most programs which ask MDOS
* for the date/time, as their buffers are likely set to 8 bytes
* and not 10. May investigate this more in the future, but it
* appears we are stuck with 2-digit displays in most programs.
*
* 05/02/98 \L8\SECT3-P3; \L8\DSRPASS-S; \L8\COPY2-P2
* Added label CYASTP and added substitution table for CYA. This
* table allows CYA to bypass the Floppy controller DIP settings,
* making SETDSK configurable from within CYA. No more surprises.
* If the values in CYASTP are "0", the floppy controller settings
* are used; if the track value is not "0", the CYA setting is
* used for that particular drive.
*
* 05/02/98 Code archived for Michael Becker - testing of new SCSI to commence.
*
* 05/07/98 \l9\GENERALS
* Date code modified - now Y2K compliant. Both routines modified
* to make 2000 a leap year and calculate dates properly.
*
* 05/12/98 \CLI\NEWCMDS & HCLIS
* Added VIDEO command
*
*-----*
* EOF *
*-----*