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Add Zero Option to TIMER Application
@MartinR-UK enhanced TIMER to allow zeroing the seconds counter. Co-Authored-By: MartinR <174514335+MartinR-UK@users.noreply.github.com>
This commit is contained in:
Wayne Warthen
@@ -1,17 +1,21 @@
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;===============================================================================
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; TIMER - Display system timer value
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; Version 1.31 24-July-2024
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; Version 1.4 25-September-2025
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;===============================================================================
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;
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; Author: Wayne Warthen (wwarthen@gmail.com)
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; Updated: MartinR (July 2024) - A user of uppercase mnemonics
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; Updated: MartinR (September 2025) - A user of uppercase Z80 mnemonics
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;_______________________________________________________________________________
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;
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; This source code would benefit from a complete resstructuring to aid clarity.
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;_______________________________________________________________________________
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;
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; Usage:
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; TIMER [/C] [/?]
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; ex: TIMER (display current timer value)
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; TIMER /? (display version and usage)
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; TIMER /C (display timer value continuously)
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; TIMER [/C] [Z] [/?]
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; ex: TIMER Display current timer value
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; TIMER /? Display version and usage
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; TIMER /C Display timer value continuously
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; TIMER /Z Set the system timer to zero
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;
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; Operation:
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; Reads and displays system timer value.
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@@ -21,7 +25,7 @@
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; This source code assembles with TASM V3.2 under Windows-11 using the
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; following command line:
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; tasm -80 -g3 -l TIMER.ASM TIMER.COM
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; ie: Z80 CPU; output format 'binary' named .COM (rather than .OBJ)
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; ie: Z80 CPU, output format 'binary' named .COM (rather than .OBJ)
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; and includes a symbol table as part of the listing file.
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;_______________________________________________________________________________
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;
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@@ -31,6 +35,7 @@
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; 2019-11-08 [WBW] Add seconds support
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; 2024-06-30 [MR ] Display values in decimal rather than hexadecimal
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; 2024-07-24 [MR ] Also display value in Hours-Mins-Secs format
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; 2025-09-25 [MR ] Add the option to set the system timer back to zero
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;_______________________________________________________________________________
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;
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; Includes binary-to-decimal subroutine by Alwin Henseler
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@@ -63,14 +68,14 @@ BF_SYSGETSECS .EQU $D1 ; SECONDS subfunction
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BF_SYSSETSECS .EQU $D1 ; SECONDS subfunction
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;
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;ASCII Control Characters
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LF .EQU 00AH ; Line Feed
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CR .EQU 00DH ; Carriage Return
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LF .EQU $0A ; Line Feed
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CR .EQU $0D ; Carriage Return
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;
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;===============================================================================
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; Code Section
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;===============================================================================
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;
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.ORG $100
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.ORG $0100
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;
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; setup stack (save old value)
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LD (STKSAV),SP ; save stack
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@@ -98,7 +103,7 @@ INIT:
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CALL PRTSTR ; print it
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;
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CALL IDBIO ; identify active BIOS
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CP 1 ; check for HBIOS
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CP 1 ; check for HBIOS
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JP NZ,ERRBIO ; handle BIOS error
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;
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LD A,RMJ << 4 | RMN ; expected HBIOS ver
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@@ -282,10 +287,12 @@ OPTION:
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RET Z ; done if so
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CP ' ' ; blank?
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RET Z ; done if so
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CP '?' ; is it a '?'?
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JP Z,USAGE ; yes, display usage
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CP 'C' ; is it a 'C', continuous?
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JP Z,SETCONT ; yes, set continuous display
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CP '?' ; Is it a '?' for 'help' command?
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JP Z,USAGE ; Yes, display usage
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CP 'C' ; Is it a 'C' for 'continuous' command?
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JP Z,SETCONT ; Yes, set continuous display mode
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CP 'Z' ; Is it a 'Z' for 'zero timer' command?
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JR Z,ZEROISE ; Set the timer to zero
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JP ERRPRM ; anything else is an error
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;
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USAGE:
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@@ -293,9 +300,21 @@ USAGE:
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;
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SETCONT:
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;
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OR $FF ; SET A TO TRUE
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LD (CONT),A ; AND SET CONTINUOUS FLAG
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JR OPTION ; CHECK FOR MORE OPTION LETTERS
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OR $FF ; Set A to true
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LD (CONT),A ; and set CONT(inous) flag
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JR OPTION ; Check for any more option letters.
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;
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ZEROISE:
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;
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LD DE,MSGZERO ; Confirm resetting system timer to zero
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CALL PRTSTR
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;
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LD B,BF_SYSSET ; HBIOS SYSSET function
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LD C,BF_SYSSETSECS ; SETSECS subfunction
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LD DE,$0000 ; set seconds value
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LD HL,$0000 ; ... to zero
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RST 08 ; Call HBIOS, DE:HL := seconds value
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JP EXIT ; Done - so exit back to CCP
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;
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; Identify active BIOS. RomWBW HBIOS=1, UNA UBIOS=2, else 0
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;
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@@ -772,14 +791,16 @@ LOOPDIV1:
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; Messages Section
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;===============================================================================
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MSGBAN .DB "TIMER v1.31, 24-Jul-2024",CR,LF
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MSGBAN .DB "TIMER v1.4, 25-Sep-2025",CR,LF
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.DB "Copyright (C) 2019, Wayne Warthen, GNU GPL v3",CR,LF
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.DB "Updated by MartinR 2024",0
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MSGUSE .DB "Usage: TIMER [/C] [/?]",CR,LF
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.DB " ex. TIMER (display current timer value)",CR,LF
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.DB " TIMER /? (display version and usage)",CR,LF
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.DB " TIMER /C (display timer value continuously)",0
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.DB "Updated by MartinR 2024 & 2025",CR,LF,0
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MSGUSE .DB "Usage: TIMER [/C] [Z] [/?]",CR,LF
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.DB " ex. TIMER Display current timer value",CR,LF
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.DB " TIMER /? Display version and usage",CR,LF
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.DB " TIMER /C Display timer value continuously",CR,LF
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.DB " TIMER /Z Set the timer to zero",0
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MSGPRM .DB "Parameter error (TIMER /? for usage)",0
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MSGZERO .DB "Setting system timer to zero",0
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MSGBIO .DB "Incompatible BIOS or version, "
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.DB "HBIOS v", '0' + rmj, ".", '0' + rmn, " required",0
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STRTICK .DB " Ticks ",0
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