CP/M/CPM_CDROM.iso/simtel/sigm/vols000/vol089/syslibc.hlp

Text File | 1985-02-09 | 9KB | 236 lines

Miscellaneous Routines -- Introduction
BDOS and BIOS Routines
Capitalization Routines
Convert ASCII to Hexadecimal
End of Code
Exchange Nybbles
Memory Fill Routines
Memory Move Routines
Delay Routine
Version Number of SYSLIB
:Miscellaneou≤ Routine≤ -- Introduction

     Thi≤á sectioεá oµá thσá Hel≡ Filσá describe≤á thσá followinτ ì
Miscellaneous Routines --
          BDOS      For Direct BDOS Interface
          BIOS      For Direct BIOS Interface
          CAPS      For Character Capitalization
          CAPSTR    For String Capitalization
          CATH      Convert ASCII Character to Hexadecimal
          CODEND    Provide End of Code/Data Area
          EN        Exchange Nybbles in A
          FILLB     Fill Memory (up to 255 bytes)
           FILLBC   Fill Memory (up to 65,535 bytes)
           HFILB    Fill Memory (up to 255 bytes)
           HFILBC   Fill Memory (up to 65,535 bytes)
          MOVEB     Move Memory (up to 255 bytes)
           MOVEBC   Move Memory (up to 65,535 bytes)
           HMOVB    Move Memory (up to 255 bytes)
           HMOVBC   Move Memory (up to 65,535 bytes)
          PAUSE     Delay N 10th of a Second
          VERSION   Return Version Number of SYSLIB
:BDOS and BIOS Routines

     Routine Name:  BDOS
     Function║
          Cal∞á CP/═á Entr∙á Poin⌠á a⌠ locatioεá ╡á anΣá preservσ ì
Register≤ DE anΣ BC.
     Inputs:  C and DE provide input parameters
     Outputs:  A and HL provide output parameters
     Registers Affected:  PSW, HL
     SYSLIB Routines Called:  -None-
     Special Error Conditions:  -Determined by Routines Called-
     Routine Name:  BIOS
     Function║
          BIO╙ provide≤ thσ use≥ witΦ ß direc⌠ interfacσ int∩ thσ ì
CP/═á BIOS«á  I⌠á i≤ calleΣ witΦ thσ ┴ Reτ containinτá thσá inde° ì
offse⌠á int∩ thσ BIO╙ JM╨ table«á  N∩ register≤ arσ preserveΣá b∙ ì
thi≤ routine«á  Thσ content≤ oµ HL¼á DE¼ anΣ B├ arσ passeΣ t∩ thσ ì
BIOS unchanged.

     The following table summarizes the BIOS JMP Table Entries --

   Offset Function
      0   Cold Start
      1   Warm Start
      2   Console Status; Returns A=0FFH if char ready, A=0 if
               not
      3   Console Input; Returns char in A
      4   Console Output; Char passed in C
      5   List Output; Char passed in C
      6   Punch Output; Char passed in C
      7   Reader Input; Returns char in A

BIOS, Con't
   Offset Function
      8   Home Disk Head (Return Version Number); Returns
               Version Number in HL
      9   Select Disk; Disk Number (A=0, etc) passed in C
     10   Set Track Number; Track Number passed in C
     11   Set Sector Number; Sector Number passed in C
     12   Set DMA Address; DMA Address passed in BC
     13   Read Block from Disk; Returns A=0 if OK, A=1 if Error
     14   Write Block to Disk; Returns A=0 if OK, A=1 if Error

     15   List Status; Returns A=0FFH if ready to output, A=0
               if not
     16   Sector Translation; Logical-to-Physical Sector
               Translation; Logical Sector Number passed in BC
               and Translate Table Address passed in DE; Returns
               Physical Sector Number in HL


BIOS, Con't
     Inputs:  A = Offset (as per Table Above)
              BC = Input Parameters
     Outputs:  A, HL = Output Parameters
     Registers Affected:  All
     SYSLIB Routines Called:  -None-
     Special Error Conditions:  -None-

:Capitalization Routines

     Routine Name:  CAPS
     Function║
          Capitalizσá ASCI╔á characte≥á iε Registe≥ ┴á iµá i⌠á i≤ ì
lower-casσá alphabetiπá (a-z)╗á otherwise¼á returε ┴á unaffected«  ì
Onl∙á thσ lowe≥ seveε bit≤ oµ thσ bytσ arσá considered¼á anΣá thσ ì
Mos⌠ Significan⌠ Bi⌠ i≤ maskeΣ ou⌠ t∩ zero.
     Inputs:  A = character to capitalize
     Outputs:  A = capitalized character
     Registers Affected:  PSW
     SYSLIB Routins Called:  -None-
     Special Error Conditions:  -None-


     Routine Name:  CAPSTR
     Function:
          CAPST╥ capitalize≤ thσ <NULL>-terminateΣ strinτ pointeΣ ì
to by HL.  No Registers are affected.
     Inputs:  HL pts to first byte of string
     Outputs:  None (String is Capitalized)
     Registers Affected:  None
     SYSLIB Routines Called:  CAPS
     Special Error Conditions:  None

:Convert ASCII to Hexadecimal

     Routine Name:  CATH
     Function║
          Conver⌠á thσá ASCI╔á Hexadecima∞á characte≥á iεá thσá ┴ ì
Registe≥ t∩ binar∙ iε thσ ┴ Register«á  Iµ invaliΣ characte≥ (no⌠ ì
0-9¼ A-F)¼ returε <SP╛ (2░ Hex⌐ iε ┴ Registe≥ a≤ erro≥ code.
     Input:  A = ASCII Hex Character (0-9, A-F)
     Output:  A = Binary value represented by char
     Registers Affected:  PSW
     SYSLIB Routines Called:  -None-
     Specia∞ Erro≥ Conditions:
          Iµá invaliΣá he°á char¼á <SP╛ (2░ Hex⌐á returneΣá iεá ┴ ì
Register.

:End of Code

     Routine Name:  CODEND
     Function║
          Returεá thσ addres≤ oµ thσ nex⌠ pagσ followinτ thσ las⌠ ì
bytσá oµ code«á  Thi≤ i≤ usefu∞ iε determininτ wherσ thσá scratcΦ ì
areß begins.
     Inputs:  None
     Output:  HL=Address of next page
     Registers Affected:  HL
     SYSLIB Routines Called:  -None-
     Special Error Conditions:  -None-

:Exchange Nybbles

     Routine Name:  EN
     Function║
          Exchangσá Nybble≤ iε Registe≥ A╗á High-orde≥ fou≥á bit≤ ì
arσ exchangeΣ witΦ Low-orde≥ fou≥ bit≤ oµ Registe≥ A.
     Inputs:  A = Byte input
     Outputs:  A = Byte output
     Registers Affected:  PSW
     SYSLIB Routines Called:  -None-
     Special Error Conditions:  -None-

:Memory Fill Routines

     Routine Names:  FILLB, FILLBC, HFILB, HFILBC
     Function║è          Thesσá routine≤ fil∞ aε areß oµ memor∙ witΦ ßá constan⌠ ì
bytσ value«á  FILL┬ caε fil∞ u≡ t∩ ß 256-bytσ buffer¼á anΣ FILLB├ ì
caε fil∞ u≡ t∩ ß 65,536-bytσ (withiε reason⌐ buffer.
     FILL┬á anΣ FILLB├ havσ n∩ effect≤ oε an∙á registers«á  HFIL┬ ì
anΣ HFILB├ botΦ affec⌠ thσ H╠ registe≥ pair¼ anΣ the∙ returε witΦ ì
H╠á pointinτ t∩ thσ bytσ afte≥ thσ las⌠ bytσ filled«á  HFIL┬á anΣ ì
HFILB├á arσá usefu∞ wheε furthe≥ processinτ froφ thσá las⌠á poin⌠ ì
filled is desired.

     Inputs:  HL points to the first byte of the buffer to be filled
              B (for FILLB) or BC (for FILLBC) = number of bytes in buffer
              A = byte value to fill buffer with


     Outputs:  None for FILLB and FILLBC (Buffer is filled)
               H╠ point≤ t∩ nex⌠ bytσ fo≥ HFIL┬ anΣ HFILBC

     Registers Affected:  None for FILLB, FILLBC; HL for HFILB,
                              HFILBC

     SYSLIB Routines Called:  -None-

     Special Error Conditions:  -None-

:Memory Move Routines

     Routine Names:  MOVEB, MOVEBC, HMOVB, HMOVBC
     Function║
          Movσ thσ blocδ oµ memor∙ pointeΣ t∩ b∙ H╠ t∩ thσ memor∙ ì
locatioεá pointeΣá t∩ b∙ DE«á  MOVE┬ caε movσ u≡á t∩á ßá 256-bytσ ì
buffer¼ anΣ MOVEB├ caε movσ u≡ t∩ ß 65,536-bytσ buffer.
     MOVE┬á anΣ MOVEB├ havσ n∩ effect≤ oε an∙á registers«á  HMOV┬ ì
anΣ HMOVB├ botΦ affec⌠ thσ H╠ registe≥ pair¼ anΣ the∙ returε witΦ ì
H╠ anΣ D┼ pointinτ t∩ thσ bytσ afte≥ thσ las⌠ bytσ moved«á  HMOV┬ ì
anΣ HMOVB├ arσ usefu∞ wheε furthe≥ processinτ froφ thσ las⌠ poin⌠ ì
filleΣ i≤ desired.

     Inputs:  HL points to the first byte of the buffer to move
              DE points to the first byte of the buffer to move to
              B (for MOVEB) or BC (for MOVEBC) = number of bytes in buffer


     Outputs:  None for MOVEB and MOVEBC (Buffer is moved)
               HL and DE pt to byte after last byte moved for
                    HMOVB and HMOVBC

     Registers Affected:  None for MOVEB, MOVBC; HL, DE for
                              HMOVB, HMOVBC

     SYSLIB Routines Called:  -None-

     Special Error Conditions:  -None-

:Delay Routine

     Routine Name:  PAUSE
     Function:
          Delay N 10ths of a Second.
     Inputs:  HL = N (Number of 10ths of a Second Delay desired)
              B = Processor Speed in MHz (1, 2, 3, 4, ...)
     Outputs:  None (Routine returns N 10ths of a Second later)
     Registers Affected:  None
     SYSLIB Routines Called:  None
     Special Error Conditons:  None


:Version Number of SYSLIB

     Routine Name:  VERSION
     Function:
          Return Version Number of SYSLIB.
     Inputs:  None
     Outputs║  HL=Versioε (H=Major¼ L=Minor╗ H=2¼ L=▒ fo≥ 2.1)
     Registers Affected:  HL
     SYSLIB Routines Called:  None
     Special Error Conditions:  None