Update documentation; return ClustSize not SecPerClust on an open request...

diff --git a/comboot.doc b/comboot.doc
index db9203a..97bb89f 100644 (file)
--- a/comboot.doc
+++ b/comboot.doc
@@ -131,8 +131,42 @@ supported INT 20h - terminate program.
 
        ++++ DOS-COMPATIBLE API CALLS ++++
 
-INT 20h:       Terminate program
+INT 20h                Terminate program
 INT 21h AH=00h Terminate program
+INT 21h AH=4Ch Terminate program
+
+       All of these terminate the program.
+
+INT 21h AH=01h Get Key with Echo
+
+       Reads a key from the console input, with echo to the console
+       output.  The read character is returned in AL.
+
+INT 21h AH=02h Write Character
+
+       Writes a character in DL to the console output.
+
+INT 21h AH=08h Get Key without Echo
+
+       Reads a key fron the console input, without echoing it to the
+       console output.  The read character is returned in AL.
+
+INT 21h AH=0Bh Check Keyboard
+
+       Returns AL=FFh if there is a keystroke waiting (which can then
+       be read with INT 21h, AH=01h or AH=08h), otherwise AL=00h.
+
+INT 21h AH=30h Check DOS Version
+
+       This function returns AX=BX=CX=DX=0, corresponding to a
+       hypothetical "DOS 0.0", but the high parts of EAX-EBX-ECX-EDX
+       spell "SYSLINUX":
+
+       EAX=53590000h EBX=534C0000h ECX=494E0000h EDX=55580000h
+
+       This function can thus be used to distinguish running on
+       SYSLINUX from running on DOS.
+
 
        ++++ SYSLINUX-SPECIFIC API CALLS ++++
 

diff --git a/comboot.inc b/comboot.inc
index 319e500..e8ec32c 100644 (file)
--- a/comboot.inc
+++ b/comboot.inc
@@ -330,7 +330,7 @@ comapi_open:
                xchg eax,edx
                shr eax,16
                xchg ax,dx
-               mov cx,[SecPerClust]
+               mov cx,[ClustSize]
                clc
                ret
 .err: