ecm 2026-04ad

source/Interrupt List/INT 21 DOS Function Calls/INT 2149 DOS 2 FREE MEMORY.txt

@@ -17,9 +17,9 @@ Notes:	apparently never returns an error 07h, despite official docs; DOS 2.1+
 	DR-DOS v7 does coalesce subsequent free blocks when a block is freed
 	the code for this function is identical in DOS 2.1-6.0 except for
 	  calls to start/end a critical section in DOS 3.0+
-	because this call need not coalesce free blocks, a very similar
-	  effect can be achieved by addressing the MCB (in the segment
-	  that is one below the memory block segment) and zeroing its owner.
+	because this call need not coalesce free blocks, a very similar effect
+	  can be achieved by addressing the MCB (in the segment that is one
+	  below the memory block segment) and zeroing its owner (see #01628).
 	  this allows freeing memory if using DOS is not desired.
 SeeAlso: AH=48h,AH=4Ah
 

source/Interrupt List/INT 21 DOS Function Calls/INT 214B DOS 2 EXEC LOAD ANDOR EXECUTE PROGRAM.txt

@@ -12,7 +12,7 @@ INT 21 - DOS 2+ - "EXEC" - LOAD AND/OR EXECUTE PROGRAM
 	    03h load overlay (see #01591)
 	    04h load and execute in background (European MS-DOS 4.0 only)
 		"Exec & Go" (see also AH=80h)
-	DS:DX -> ASCIZ program name (must include extension)
+	DS:DX -> ASCIZ program filename (must include extension)
 	ES:BX -> parameter block (see #01590,#01591,#01592)
 	CX = mode (subfunction 04h only)
 		0000h child placed in zombie mode after termination
@@ -152,7 +152,7 @@ BUGS:	DOS 2.00 assumes that DS points at the current program's PSP
 	  top word of the caller's stack if the loaded module terminates with
 	  INT 21/AH=4Ch in some versions of MS-DOS, including v5.00.
 SeeAlso: AX=4B05h,AH=4Ch,AH=4Dh,AH=64h/BX=0025h,AH=8Ah,INT 2E,INT 60/DI=0604h
-SeeAlso: AX=4B80h"FreeDOS"
+SeeAlso: AX=4B80h"FreeDOS",AX=714Bh"RxDOS"
 
 Format of EXEC parameter block for AL=00h,01h,04h:
 Offset	Size	Description	(Table 01590)

source/Interrupt List/INT 21 DOS Function Calls/INT 2158 DOS 211 GET OR SET MEMORY ALLOCATION STRATEGY.txt

@@ -11,7 +11,7 @@ INT 21 - DOS 2.11+ - GET OR SET MEMORY ALLOCATION STRATEGY
 		Return: AX = current strategy (see #01679)
 	    01h set allocation strategy
 		BL = new allocation strategy (see #01679)
-		BH = 00h (DOS 5+)
+		BH = 00h (DOS 5+), new extended strategy (lDOS)
 Return: CF clear if successful
 	CF set on error
 	    AX = error code (01h) (see #01680)
@@ -25,7 +25,7 @@ Notes:	the Set subfunction accepts any value in BL for DOS 3.x and 4.x;
 	  before terminating
 	Toshiba MS-DOS v2.11 supports subfunctions 00h and 01h, as does the
 	  TI Professional MS-DOS v2.13
-	DR DOS 3.41 reportedly reverses subfunctions 00h and 01h
+BUGS:	DR DOS 3.41 reportedly reverses subfunctions 00h and 01h
 SeeAlso: AH=48h,AH=49h,AH=4Ah,INT 2F/AX=4310h"XMS",INT 67/AH=3Fh
 SeeAlso: AX=4B80h"FreeDOS"
 
@@ -34,7 +34,7 @@ Values for DOS memory allocation strategy:
  00h all memory first fit
  01h all memory best fit
  02h all memory last fit
----DOS 5+ ---
+--- DOS 5+ ---
  40h upper memory first fit
  41h upper memory best fit
  42h upper memory last fit

source/Interrupt List/INT 21 DOS Function Calls/INT 2158 DOS 5 GET OR SET UMB LINK STATE.txt

@@ -33,4 +33,11 @@ Notes:	a program which changes the UMB link state should restore it before
 	DOS keeps track of the UMB link state in an internal variable too
 	if the extended allocation strategy mask 100h is set (see #01679
 	  at AH=58h), lDOS can use UMBs even with the UMB link disabled.
+BUGS:	FreeDOS only allocates UMBs once during fdconfig.sys processing,
+	  after the first device driver that provides at least one UMB on
+	  the XMS interface (see INT 2F/AX=4310h). (FreeDOS kernel issue
+	  #250.) reportedly, MS-DOS will allocate any additional UMBs
+	  after subsequent drivers were loaded. this is also true of lDOS.
+	FreeDOS tries to allocate the first UMB without checking that it
+	  is large enough with DOSDATA=UMB (FreeDOS kernel issue #203).
 SeeAlso: #01687,#02766 at INT 2F/AX=4310h,AX=4B80h"FreeDOS"

source/Interrupt List/INT 21 DOS Function Calls/INT 21714B RxDOS LONG FILENAME EXEC.txt

@@ -0,0 +1,22 @@
+----------------------------------------------------------------------------
+ Unique ID: 21714B
+  Category: D 	DOS kernel
+      Flag: n/a
+----------------------------------------------------------------------------
+
+INT 21 - RxDOS - LONG FILENAME - "EXEC" - LOAD AND/OR EXECUTE PROGRAM
+	AX = 714Bh
+	CL = type of load
+	    00h load and execute
+	    01h load but do not execute
+	    03h load overlay (see #01591)
+	DS:DX -> ASCIZ program long filename (must include extension)
+	ES:BX -> parameter block (see #01590,#01591,#01592)
+Return:	as for AH=4Bh
+	CF unchanged and AL = 00h if no LFNs are supported at all
+	possibly other error (eg 01h) with LFN servers other than RxDOS's
+SeeAlso: AH=4Bh,AX=335Eh,AX=3360h
+Notes:	supported by LFN builds of RxDOS (such as v7.1.5)
+	should be called with CF set as function 71h subfunctions may
+	  return with DOS v1 style error return (AL = 00h, CF unchanged).
+	  if caller sets CF this results in an AX = 7100h, CF set return.

source/Interrupt List/INT 21 DOS Function Calls/INT 2171A6 Windows95 LONG FILENAME GET FILE INFO BY HANDLE.txt

@@ -14,7 +14,7 @@ Return: CF clear if successful
 	CF set on error
 	    AX = error code
 		7100h if function not supported
-SeeAlso: AX=71A7h/BL=00h
+SeeAlso: AX=71A7h/BL=00h,INT 2F/AX=11A6h"dosemu2"
 Notes:	supported by FAT+ builds of Enhanced DR-DOS on local FAT FS drives;
 	  only SFNs are actually used but the DOS wants to be able to return
 	  64-bit file sizes (as FAT+ allows 38-bit file sizes on disk).