ecm 2026-04z

source/Cmos-Memory Map/_Note.txt

@@ -44,7 +44,7 @@ screen in 8 rows of 16 values.
 The CMOS RAM space has an upper limit of 128 bytes because of the structure
 of port 70: only bits 0-6 are used for addressing, bit 7 is used to 
 enable (0) or disable (1) Non-Maskable Interrupts (NMI) and explains why
-IBM uses 80h OR <address> to read/write data & follows with  a "throw-away"
+IBM uses 80h OR <address> to read/write data & follows with a "throw-away"
 call.
 
 Note that if the CMOS only has 64 bytes available, addressing will 
@@ -126,9 +126,9 @@ CHECKS_ADDRESS	DW	0
 
 CMOS_DATA	DB   128 DUP (?)
 
-
+
 ----------------------------------------------------------------------------
-
+
 		Organization of CMOS Memory - Clock
 
 00h-0Eh is defined by the clock hardware and all must follow it.  Other 
@@ -142,16 +142,16 @@ of which are read/write and two of which are read only.
 
 The format of the ten clock data registers (bytes 00h-09h) is:
 
-
+
 ----------------------------------------------------------------------------
-
+
 		Organization of CMOS Memory - non-Clock
 
 The last two bytes in the first hexadecimal decade (hexade ?) were not 
 specified in the PC/AT but may have the following use on some systems:
-
+
 ----------------------------------------------------------------------------
-
+
 
 The second group of values extends from address 10h to 2Dh. The word at
 2Eh-2Fh is a byte-wise summation of the values in these bytes. Most BIOSes
@@ -162,17 +162,17 @@ version of MSD reports my XT as having 20+ MB of extended memory.
 Where a definiton appears universal, no identification is made. Where
 the definition is thought to be specific to a manufacturer/model (AMI, 
 AMSTRAD, IBM AT, IBM PS/2) the identification is enclosed in parens. The
-AMSTAD definitions appear to relate to 8088/8086 (PC and PC/XT class)
-mchines only. AT class machines appear to adhere to IBM PC/AT fornat.
+AMSTRAD definitions appear to relate to 8088/8086 (PC and PC/XT class)
+machines only. AT class machines appear to adhere to IBM PC/AT format.
+
 
-
 ----------------------------------------------------------------------------
-
+
 
  End of original 64 CMOS RAM bytes. Many modern chips now contain 128
  bytes and the IBM PS/2 has provision for 2k of "Expansion CMOS". 
  The AMI HI-FLEX description is below. If the chip does have only
  64 bytes, addresses will wrap so that requests for bytes 40h-7Fh will 
  return the same values as 00h-3Fh.
 
-
+

source/Interrupt List/INT 21 DOS Function Calls/INT 2136 DOS 2 GET FREE DISK SPACE.txt

@@ -22,5 +22,4 @@ Notes:	free space on drive in bytes is AX * BX * CX
 	  use AX=4402h"CD-ROM" instead
 	(FAT32 drive) the reported total and free space are limited to 2G-32K
 	  should they exceed that value
-SeeAlso: AH=1Bh,AH=1Ch,AX=4402h"CD-ROM",AX=7303h
-
+SeeAlso: AH=1Bh,AH=1Ch,AX=4402h"CD-ROM",AX=7303h,INT 2F/AX=110Ch

source/Interrupt List/INT 21 DOS Function Calls/INT 214C DOS 2 EXIT TERMINATE WITH RETURN CODE.txt

@@ -8,9 +8,10 @@ INT 21 - DOS 2+ - "EXIT" - TERMINATE WITH RETURN CODE
 	AH = 4Ch
 	AL = return code
 Return: never returns
-Notes:	unless the process is its own parent
-	  (see #01378 [offset 16h] at AH=26h), all open files are closed and
-	  all memory belonging to the process is freed
+Notes:	unless the process is its own parent (see #01378 [offset 16h] at
+	  AH=26h), all open files are closed and all memory belonging to the
+	  process is freed. (the same code path of not closing handles and
+	  not freeing memory is taken for TSR AH=31h.)
 	the parent process is made the current process. this INT 21 call
 	  reads the SS:SP stack of the parent from the parent's PSP (see
 	  #01378 [offset 2Eh] at AH=26h) and returns on that user stack,
@@ -40,5 +41,4 @@ Notes:	unless the process is its own parent
 	  so that they receive exactly the same user stack as was set
 	  up by the interrupt caller.
 SeeAlso: AH=00h,AH=26h,AH=4Bh,AH=4Dh,INT 15/AH=12h/BH=02h,INT 20,INT 22
-SeeAlso: INT 60/DI=0601h
-
+SeeAlso: INT 60/DI=0601h,INT 2F/AX=111Dh,INT 2F/AX=1122h

source/Interrupt List/INT 21 DOS Function Calls/INT 217142 EDR-DOS 64-bit seek.txt

@@ -18,7 +18,7 @@ Return: CF clear if successful
 	    AX = error code (01h,06h) (see #01680 at AH=59h/BX=0000h)
 	CF unchanged or CF set if no function 71h subfunctions supported
 	    AX = error code (7100h)
-SeeAlso: AH=42h
+SeeAlso: AH=42h,INT 2F/AX=1142h"dosemu2",INT 2F/AX=11C2h"dosemu2"
 Notes:	supported by FAT+ builds of Enhanced DR-DOS (including 2023+ lDOS
 	  flavour and if FATPLUS option enabled for 2023+ SvarDOS flavour;
 	  the SvarDOS fork introduced the FATPLUS option to disable it by

source/Interrupt List/INT 21 DOS Function Calls/INT 217303 Windows95 FAT32 GET EXTENDED FREE SPACE ON DRIVE.txt

@@ -25,7 +25,7 @@ BUGS:	this function returns a maximum of 2GB free space even on an FAT32
 	  partition larger than 2GB under some versions of Win95 and Win98,
 	  apparently by limiting the number of reported free clusters to no
 	  more than 64K -- but only in a DOS window if a TSR has hooked INT 21h
-SeeAlso: AX=7302h,AX=7304h,AX=7305h,AH=36h
+SeeAlso: AX=7302h,AX=7304h,AX=7305h,AH=36h,INT 2F/AX=11A3h"dosemu2"
 
 Format of extended free space structure:
 Offset	Size	Description	(Table 01789)

source/Interrupt List/INT 2F Multiplex/Networking/INT 2F110C NETWORK REDIRECTOR GET DISK INFORMATION.txt

@@ -16,5 +16,4 @@ Return: CF clear if data valid
 	    DX = number of available clusters
 	CF set if data invalid
 Notes:	this function is called by the DOS 3.1+ kernel
-SeeAlso: INT 21/AH=36h
-
+SeeAlso: INT 21/AH=36h,AX=11A3h"dosemu2"

source/Interrupt List/INT 2F Multiplex/Networking/INT 2F111D NETWORK REDIRECTOR CLOSE ALL REMOTE FILES FOR PROCESS ABORT.txt

@@ -15,8 +15,7 @@ Notes:	used when a process is aborted; the process being terminated is
 	this function is called by the DOS 3.1+ kernel
 	closes all FCBs opened by process
 	this is only called if the process being terminated isn't self-
-	  parented and the termination is no TSR.
+	  parented and the termination is no TSR (INT 21/AH=31h).
 	called after all PHT / Job File Table entries have been closed,
 	  and before FCB SFTs and busy SFTs are freed.
-SeeAlso: INT 21/AX=5D04h
-
+SeeAlso: AX=1122h,INT 21/AH=4Ch,INT 21/AX=5D04h

source/Interrupt List/INT 2F Multiplex/Networking/INT 2F1121 NETWORK REDIRECTOR SEEK FROM END OF REMOTE FILE.txt

@@ -18,6 +18,10 @@ Return: CF set on error
 Notes:	this function is called by the DOS 3.1+ kernel, but only when seeking
 	  from the end of a file opened with sharing modes set in such a
 	  manner that another process is able to change the size of the file
-	  while it is already open
+	  while it is already open. if the seek origin is the file's current
+	  seek or the start of the file, its resulting seek can be entirely
+	  determined by DOS's local understanding of the file (its SFT). if
+	  the seek origin is EOF and EOF may have changed, the redirector
+	  must be called to determine the final seek.
 SeeAlso: AX=1228h,INT 21/AH=42h
 

source/Interrupt List/INT 2F Multiplex/Networking/INT 2F1142 NETWORK REDIRECTOR dosemu2 64bit SEEK obsolete.txt

@@ -0,0 +1,22 @@
+----------------------------------------------------------------------------
+ Unique ID: 2F1142
+  Category: N   network
+      Flag: C   callout or callback (usually hooked rather than called)
+----------------------------------------------------------------------------
+
+INT 2F C - NETWORK REDIRECTOR - dosemu2 - 64-bit SEEK (obsolete)
+	AX = 1142h
+	DS:DX -> 64-bit seek buffer (in destination offset, out result seek)
+	CL = origin of move
+	    00h start of file
+	    01h current file position
+	    02h end of file
+	ES:DI -> SFT
+Return: CF set on error
+	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
+	CF clear if successful
+	    buffer updated with new 64-bit file position
+Notes:	called by fdpp or lDOS SEEKEXT to service 64-bit seeking from
+	  INT 21/AX=7142h on a redirector SFT
+	historical, now function number AX=11C2h is used
+SeeAlso: INT 21/AH=42h,INT 21/AX=7142h,AX=11C2h

source/Interrupt List/INT 2F Multiplex/Networking/INT 2F11A3 NETWORK REDIRECTOR dosemu2 GET LARGE DISK SPACE.txt

@@ -0,0 +1,17 @@
+----------------------------------------------------------------------------
+ Unique ID: 2F11A3
+  Category: N   network
+      Flag: C   callout or callback (usually hooked rather than called)
+----------------------------------------------------------------------------
+
+INT 2F C - NETWORK REDIRECTOR - dosemu2 - GET LARGE DISK SPACE
+	AX = 11A3h
+	ES:DI -> CDS
+Return: CF set on error
+	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
+	CF clear if successful
+	    SI = block size (currently always 512)
+	    AX:BX = number of blocks on disk, clamped to all-1s
+	    CX:DX = number of blocks free, clamped to all-1s
+Notes:	called by fdpp to service INT 21/AX=7303h on a redirector drive
+SeeAlso: INT 21/AX=7303h

source/Interrupt List/INT 2F Multiplex/Networking/INT 2F11A6 NETWORK REDIRECTOR dosemu2 GET LARGE FILE INFO.txt

@@ -0,0 +1,17 @@
+----------------------------------------------------------------------------
+ Unique ID: 2F11A6
+  Category: N   network
+      Flag: C   callout or callback (usually hooked rather than called)
+----------------------------------------------------------------------------
+
+INT 2F C - NETWORK REDIRECTOR - dosemu2 - GET LARGE FILE INFO
+	AX = 11A6h
+	DS:DX -> buffer for result (see #01784)
+	ES:DI -> SFT
+Return: CF set on error
+	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
+	CF clear if successful
+	    buffer written
+Notes:	called by fdpp or lDOS SEEKEXT to service INT 21/AX=71A6h on a
+	  redirector SFT
+SeeAlso: INT 21/AX=71A6h

source/Interrupt List/INT 2F Multiplex/Networking/INT 2F11C2 NETWORK REDIRECTOR dosemu2 64bit SEEK.txt

@@ -0,0 +1,22 @@
+----------------------------------------------------------------------------
+ Unique ID: 2F11C2
+  Category: N   network
+      Flag: C   callout or callback (usually hooked rather than called)
+----------------------------------------------------------------------------
+
+INT 2F C - NETWORK REDIRECTOR - dosemu2 - 64-bit SEEK
+	AX = 11C2h
+	DS:DX -> 64-bit seek buffer (in destination offset, out result seek)
+	CL = origin of move
+	    00h start of file
+	    01h current file position
+	    02h end of file
+	ES:DI -> SFT
+Return: CF set on error
+	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
+	CF clear if successful
+	    buffer updated with new 64-bit file position
+Notes:	called by fdpp or lDOS SEEKEXT to service 64-bit seeking from
+	  INT 21/AX=7142h on a redirector SFT
+	previously used function number AX=1142h
+SeeAlso: INT 21/AH=42h,INT 21/AX=7142h,AX=1142h