QUICK START FOR THE IBM PC AND DOS 2.0

If you are using an IBMPC, DOS 2.0, more then 64k of memory, and are tired
of waiting for the BIOS ram check the following will cure the blues.

First Create a copy of your DOS 2.0 disk.  Anytime you transfer the system use
this modified disk.

At the DOS prompt type 'DEBUG'.  The DEBUG prompt '-' will appear.
Then type, ommitting the comments:

   L 100 0 0 1     <enter> ;load the boot record from disk in drive A:
   A 100           <enter> ;start debug's assemble mode
   JMP 282         <enter> ;jump to the modified portion of the boot record
                   <enter> ;end debug's assemble mode
   A 282           <enter> ;start assemble mode at beginning of new code)
   XOR  AX,AX      <enter> ;zero AX
   OUT  A0,AL      <enter> ;disable NMI
   MOV  BX,1000    <enter> ;Set ES at beginning
   MOV  ES,BX      <enter> ;       of 2nd 64KB block
   XOR  DI,DI      <enter> ;zero DI
   MOV  CX,8000    <enter> ;set counter for 32K writes
   REPZ            <enter> ;write zero's to
   STOSW           <enter> ;        64KB block)
   ES:             <enter>
   CMP  [0000],AX  <enter> ;compare 1st word
   JNZ  2A3        <enter> ;exit if read <> write
   ADD  BX,1000    <enter> ;increment by  64KB)
   CMP  BX,A000    <enter> ;check for 640KB max memory
   JNZ  289        <enter> ;loop if not finished)
   MOV  CL,06      <enter> ;prepare for bit shift
   SHR  BX,CL      <enter> ;do the shift
   MOV  DS,AX      <enter> ;DS=zero
   MOV  [413],BX   <enter> ;store the total amount of memory in BIOS's address
   MOV  AL,80      <enter> ;prepare to enable NMI
   OUT  A0,AL      <enter> ;enable NMI
   JMP  12E        <enter> ;continue on as if nothing happened
                   <enter>
   W 100 0 0 1     <enter> ;write out the modified boot record
   Q                       ;goodbye to debug


These changes modify the boot record.  It should be used only on disks where
the 'system' exists as it overlays the DOS message 'Non-system disk error
replace and strike any key when ready'. Next open up your computer and set the
memory switches to 64k.  Then insert your modified DOS disk and boot up.

Notice the short wait!

To copy the modified boot record on existing disks which contain the system
simply insert your modified DOS disk and type:

    L 100 0 0 1 <enter>    ;load the modified boot record

Now insert the disk you wish to add the modified boot record to and type:

    W 100 0 0 1 <enter>    ;write out the modified boot record

and the disk will be modified.


 By Mike Cumming
 94 Aldershot Blvd
 Winnipeg, Manitoba
 CANADA  R3P 0E1

***SVCS Librarian comment:  This technique is not compatable with some
software.  In particular, attempting to install a QuadRAM drive will crash.
In general, any program which employs an INT 19  (reboot) is a potential
problem.  QUIKUP and QUIKUPQD (SVCS disk No. 043) will get you up nearly
as fast without modification of system software.  Boot sector patches by
the hard disk folk tend to suffer from INT 19 hangups also.

To facilitate installation of the above modifications file QS.RIO has been
supplied for redirected I/O input to DEBUG.  It modifies the boot sector of
the disk in drive A:.  Think first because is doesn't allow for brain lag.
Use the form `DEBUG <QS.RIO'.   Indicate drives as required.   hs
D

DISPSEG:
	MOV	AL,SEGADD+1	; GET THE FIRST SEGME