Added DOSVER tool for checking MS-DOS Version)

.gitignore

@@ -5,6 +5,8 @@ rom
 **/.D*
 **/*.log
 **/*.cmd
+**/*.exe
+**/*.com
 **/*.lib
 **/.*.swp
 **/*.obj

Makefile

@@ -1,6 +1,9 @@
 AS=aztec34_as
 CC=aztec34_cc
 AR=aztec34_lib
+MASM=pcdev_masm
+LINK=pcdev_link
+EXE2BIN=pcdev_exe2bin
 CFLAGS=-I. -B +0 -D__CPM86__
 STRIP=aztec34_sqz
 LDFLAGS=-lc86
@@ -11,7 +14,7 @@ RASM86=pcdev_rasm86
 TOOLS=rm.cmd more.cmd write.cmd dump.cmd mode.cmd ls.cmd \
     cls.cmd pause.cmd reboot.cmd tod.cmd ver.cmd touch.cmd wc.cmd \
     atinit.cmd attime.cmd ciotest.cmd ball.cmd getch.cmd printenv.cmd \
-    mem.cmd
+    mem.cmd dosver.com
 EXTRAS=clsansi.cmd
 PCETOOLS=pce/pceexit.cmd pce/pcever.cmd pce/pcemnt.cmd pce/pcetime.cmd \
     pce/pceinit.cmd
@@ -101,6 +104,15 @@ mem.obj: mem.a86 tinylib.a86
 
 atinit.obj: atinit.a86 baselib.a86 tinylib.a86 atclock.a86
 
+dosver.com: dosver.exe
+	$(EXE2BIN) dosver.exe dosver.com
+
+dosver.exe: dosver.obj
+	$(LINK) dosver \;
+
+dosver.obj: dosver.asm
+	$(MASM) dosver \;
+
 %.cmd: %.obj
 	$(LINK86) $* '[$$sz]'
 
@@ -113,6 +125,7 @@ atinit.obj: atinit.a86 baselib.a86 tinylib.a86 atclock.a86
 
 clean:
 	$(RM) *.o *.h86 *.log *.sym *.prn *.lst *.obj $(TOOLS) util.lib
+	$(RM) dosver.exe
 	$(RM) cpmtest.img ccpmtest.img dostest.img hack.img
 	(cd pce;make clean)
 

README.md

@@ -100,7 +100,7 @@ For the status, (\\s: space, \\\\: \\, \\u: upper, \\l: lower)
 - CLS: Clear screen (clsansi is a vt100/ansi version as opposed to vt52 for PC)
 - PAUSE: submit tool waiting for a keystroke
 - TOD: Replacement for CP/M-86 without the 78-99 year constraint and date/time validation including leap years. It does not fix the visual issue of the century hard coded to 19. Patches exist for that. It has exactly the same behaviour as the original CP/M-86 tod.cmd tool. (CP/M-86 1.1 for PC/XT only)
-- VER: Displays the BDOS version
+- VER: Displays the BDOS version (DOSVER.COM is provided to display MS-DOS Compatibility on PC-MODE compatible OSes)
 - MEM: Displays the available and system memory
 - BALL: A simple CGA demo (CP/M-86 1.1 for PC/XT, DOS Plus and CCP/M-86 or Concurrent DOS BDOS > 3.1) (take on https://www.z80cpu.eu/mirrors/klaw/bouncy.zip)
 - GETCH: A simple keyboard scanner

dosver.asm

@@ -0,0 +1,65 @@
+
+program  segment
+        assume cs:program, ds:program
+        org    100h
+_start:     
+        mov    cx,0Ch
+        int    0E0h
+        push   ax
+        lea    dx,[_header]
+        mov    ah, 09h
+        int    21h
+        pop    ax
+        cmp    al,41h
+        jb     _print_v1
+        mov    ah, 30h
+        int    21h
+        push   ax
+        xor    ah,ah
+        call   _print_dec
+        mov    dl, '.'
+        mov    ah, 02h
+        int    21h
+        pop    ax
+        mov    al,ah
+        xor    ah,ah
+        call   _print_dec
+        lea    dx,[_nl]
+        mov    ah, 09h
+        int    21h
+        jmp    _exit
+_print_v1:
+        lea    dx,[_v1]
+        mov    ah, 09h
+        int    21h
+_exit:
+        int    20h
+_print_dec:
+        mov    cx,0
+        mov    dx,0
+_print_dec_loop:
+        cmp    ax,0
+        je     _print_dec_1     
+        mov    bx,10       
+        div    bx                 
+        push   dx             
+        inc    cx             
+        xor    dx,dx
+        jmp    _print_dec_loop
+_print_dec_1:
+        cmp    cx,0
+        je     _print_dec_exit
+        pop    dx
+        add    dx,48
+        mov    ah,02h
+        int    21h
+        dec    cx
+        jmp    _print_dec_1
+_print_dec_exit:
+        ret
+            
+_header  db    "MS-DOS Level $"
+_v1      db    "1.1"
+_nl      db    13, 10, "$"
+program  ends
+         end _start