LoopZ · shidel · Apr 4, 2026 · Apr 4, 2026 · Apr 4, 2026 · Apr 4, 2026
diff --git a/source/Glossary/86DOS.txt b/source/Glossary/86DOS.txt
@@ -0,0 +1,5 @@
+86-DOS
+
+	early ancestor of IBM PC-DOS and MS-DOS. the interfaces were
+largely copied from CP/M. also used as a generic term for the likes
+of DOS compatibles running on x86/PC platforms.
diff --git a/source/Glossary/AMIS.txt b/source/Glossary/AMIS.txt
@@ -1,3 +1,3 @@
 AMIS
 
-	Alternate Multiplex Interrupt Specification
+	see Alternate Multiplex Interrupt Specification
diff --git a/source/Glossary/Alternate Multiplex Interrupt Specification.txt b/source/Glossary/Alternate Multiplex Interrupt Specification.txt
@@ -0,0 +1,8 @@
+Alternate Multiplex Interrupt Specification
+
+	standardised protocol for allocating and enumerating multiplex
+numbers on a new INT 2D interface. up to 256 multiplexers using AMIS
+may be installed at the same time. INT 2D functions (in AL) 00h to 0Fh
+are assigned to or reserved for common AMIS functions, while functions
+10h to FFh are for private AMIS functions to be defined separately for
+each multiplexer. the multiplex number to operate on is passed in AH.
diff --git a/source/Glossary/CPM86.txt b/source/Glossary/CPM86.txt
@@ -2,5 +2,5 @@ CP/M-86
 
 	One of the three operating systems offered by IBM for its
 original PC (the other two were MSDOS and the UCSD p-System).  It has
-since evolved into DR-DOS version 6 and Novell DOS 7.
-
+since evolved into DOS Plus, DR-DOS, Novell DOS, Caldera OpenDOS,
+and Enhanced DR-DOS.
diff --git a/source/Glossary/DOS.txt b/source/Glossary/DOS.txt
@@ -0,0 +1,4 @@
+DOS
+
+	Disk Operating System, in IBM PC contexts usually referring to
+the 86-DOS family or compatibles.
diff --git a/source/Glossary/DPB.txt b/source/Glossary/DPB.txt
@@ -1,4 +1,3 @@
 DPB
 
-	see Drive Paramter Block
-
+	see Drive Parameter Block
diff --git a/source/Glossary/DRDOS.txt b/source/Glossary/DRDOS.txt
@@ -0,0 +1,5 @@
+DR-DOS
+
+	Digital Research DOS, based on CP/M-86 and DOS Plus. later
+renamed Novell DOS, Caldera OpenDOS, forked as Enhanced DR-DOS, and
+renamed DR-DOS again.
diff --git a/source/Glossary/Enhanced DRDOS.txt b/source/Glossary/Enhanced DRDOS.txt
@@ -0,0 +1,5 @@
+Enhanced DR-DOS
+
+	Enhanced DR-DOS kernel and shell from the DR-DOS/OpenDOS
+Enhancement Project, based on the 1997-05-01 release of the Caldera
+OpenDOS Machine Readable Source Kit v7.01
diff --git a/source/Glossary/FreeDOS.txt b/source/Glossary/FreeDOS.txt
@@ -0,0 +1,4 @@
+FreeDOS
+
+	project to create a FLOSS DOS version, started in 1994.
+ongoing as of 2026.
diff --git a/source/Glossary/IBM PCDOS.txt b/source/Glossary/IBM PCDOS.txt
@@ -0,0 +1,5 @@
+IBM PC-DOS
+
+	IBM Personal Computer DOS. IBM branded variant of MS-DOS,
+later continued as a fork. old sources included in the 2018 MS-DOS
+v2 and 2024 MS-DOS v4 releases.
diff --git a/source/Glossary/IISP.txt b/source/Glossary/IISP.txt
@@ -1,3 +1,4 @@
 IISP
 
-	IBM Interrupt Sharing Protocol
+	IBM Interrupt Sharing Protocol, see Table #02568 in INT 2D.
+used by MS-DOS/PC-DOS STACKS INT hooks and by AMIS multiplexers.
diff --git a/source/Glossary/MSDOS.txt b/source/Glossary/MSDOS.txt
@@ -0,0 +1,5 @@
+MS-DOS
+
+	Microsoft DOS, Microsoft branded variant of IBM PC-DOS.
+old sources included in the 2018 MS-DOS v2 and 2024 MS-DOS v4
+releases. late versions were bundled with MS Windows 95, 98, Me.
diff --git a/source/Glossary/Novell DOS.txt b/source/Glossary/Novell DOS.txt
@@ -0,0 +1,3 @@
+Novell DOS
+
+	Novell's renamed DR-DOS v7.00
diff --git a/source/Glossary/OpenDOS.txt b/source/Glossary/OpenDOS.txt
@@ -0,0 +1,6 @@
+OpenDOS
+
+	Caldera's renamed DR-DOS v7.01, also shipping with source
+texts for the kernel and shell in the 1997-05-01 release of the
+Caldera OpenDOS Machine Readable Source Kit v7.01
+
diff --git a/source/Glossary/PCDOS.txt b/source/Glossary/PCDOS.txt
@@ -0,0 +1,3 @@
+PC-DOS
+
+	see IBM PC-DOS
diff --git a/source/Glossary/RxDOS.txt b/source/Glossary/RxDOS.txt
@@ -0,0 +1,5 @@
+RxDOS
+
+	independently developed DOS kernel and shell, released under
+GNU GPL (any version) as v7.1.5 on 1999-08-07. an earlier version is
+the subject of the book "Dissecting DOS".
diff --git a/source/Glossary/lDOS.txt b/source/Glossary/lDOS.txt
@@ -0,0 +1,7 @@
+lDOS
+
+	ecm's DOS kernels and associated software, including the lDOS
+boot loaders and stages, lDebug debugger, lmacros macro collection
+for the Netwide Assembler, lRxDOS kernel, lEDR-DOS kernel, lMS-DOS
+kernel (the latter is now known as simply the lDOS kernel). note that
+the first letter is a small L, not a capital i.
diff --git a/source/Glossary/lEDRDOS.txt b/source/Glossary/lEDRDOS.txt
@@ -0,0 +1,7 @@
+lEDR-DOS
+
+	lDOS flavour fork of Enhanced DR-DOS v7.01.08 WIP, based on
+the source texts of the 2011-07-21 release of the  DR-DOS/OpenDOS
+Enhancement Project, in turn based on the 1997-05-01 release of
+the Caldera OpenDOS Machine Readable Source Kit v7.01 (sources of
+the kernel and shell)
diff --git a/source/Glossary/lMSDOS.txt b/source/Glossary/lMSDOS.txt
@@ -0,0 +1,4 @@
+lMS-DOS
+
+	lDOS fork of MS-DOS v4.01, based on the FLOSS release of
+MS-DOS v4.00 in 2024 April.
diff --git a/source/Glossary/lRxDOS.txt b/source/Glossary/lRxDOS.txt
@@ -0,0 +1,4 @@
+lRxDOS
+
+	lDOS fork of RxDOS v7.1.5, based on the 1999-08-07 GNU GPL
+(any version) source text release.
diff --git a/source/Interrupt List/INT 12 BIOS GET MEMORY SIZE/INT 12 BIOS GET MEMORY SIZE.txt b/source/Interrupt List/INT 12 BIOS GET MEMORY SIZE/INT 12 BIOS GET MEMORY SIZE.txt
@@ -6,7 +6,7 @@
 
 INT 12 - BIOS - GET MEMORY SIZE
 Return: AX = kilobytes of contiguous memory starting at absolute address 00000h
-Note:	this call returns the contents of the word at 0040h:0013h; in PC and
-	  XT, this value is set from the switches on the motherboard
+Note:	this call returns the contents of the word at MEM 0040h:0013h; in PC
+	  and XT, this value is set from the switches on the motherboard
 SeeAlso: INT 11"BIOS",INT 2F/AX=4A06h,INT 4C"Tandy 2000",MEM 0040h:0013h
-
+
diff --git a/source/Memory Map/MEM 0040h 0013h BASE MEMORY SIZE IN KBYTES.txt b/source/Memory Map/MEM 0040h 0013h BASE MEMORY SIZE IN KBYTES.txt
@@ -6,5 +6,8 @@
 
 MEM 0040h:0013h - BASE MEMORY SIZE IN KBYTES
 Size:	WORD
+Notes:	bootable lDebug will decrease the value in this WORD to reserve
+	  memory at the top of the Low Memory Area to itself. the total
+	  allocation size is 167 KiB for a current ldebug.com
 SeeAlso: INT 12
-
+