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diff --git a/include/iprt/asm-amd64-x86-watcom-16.h b/include/iprt/asm-amd64-x86-watcom-16.h
new file mode 100644
index 00000000..a3fd3ebd
--- /dev/null
+++ b/include/iprt/asm-amd64-x86-watcom-16.h
@@ -0,0 +1,831 @@
+/** @file
+ * IPRT - AMD64 and x86 Specific Assembly Functions, 16-bit Watcom C pragma aux.
+ */
+
+/*
+ * Copyright (C) 2006-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef IPRT_INCLUDED_asm_amd64_x86_watcom_16_h
+#define IPRT_INCLUDED_asm_amd64_x86_watcom_16_h
+/* no pragma once */
+
+#ifndef IPRT_INCLUDED_asm_amd64_x86_h
+# error "Don't include this header directly."
+#endif
+
+/*
+ * Turns out we cannot use 'ds' for segment stuff here because the compiler
+ * seems to insists on loading the DGROUP segment into 'ds' before calling
+ * stuff when using -ecc.  Using 'es' instead as this seems to work fine.
+ *
+ * Note! The #undef that preceds the #pragma aux statements is for undoing
+ *       the mangling, because the symbol in #pragma aux [symbol] statements
+ *       doesn't get subjected to preprocessing.  This is also why we include
+ *       the watcom header at both the top and the bottom of asm-amd64-x86.h file.
+ */
+
+#undef      ASMGetIDTR
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetIDTR = \
+    ".286p" \
+    "sidt fword ptr es:[bx]" \
+    parm [es bx] \
+    modify exact [];
+#endif
+
+#undef      ASMGetIdtrLimit
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetIdtrLimit = \
+    ".286p" \
+    "sub  sp, 8" \
+    "mov  bx, sp" \
+    "sidt fword ptr ss:[bx]" \
+    "mov  bx, ss:[bx]" \
+    "add  sp, 8" \
+    parm [] \
+    value [bx] \
+    modify exact [bx];
+#endif
+
+#undef      ASMSetIDTR
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetIDTR = \
+    ".286p" \
+    "lidt fword ptr es:[bx]" \
+    parm [es bx] nomemory \
+    modify nomemory;
+#endif
+
+#undef      ASMGetGDTR
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetGDTR = \
+    ".286p" \
+    "sgdt fword ptr es:[bx]" \
+    parm [es bx] \
+    modify exact [];
+#endif
+
+#undef      ASMSetGDTR
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetGDTR = \
+    ".286p" \
+    "lgdt fword ptr es:[bx]" \
+    parm [es bx] nomemory \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMGetCS
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetCS = \
+    "mov ax, cs" \
+    parm [] nomemory \
+    value [ax] \
+    modify exact [ax] nomemory;
+#endif
+
+#undef      ASMGetDS
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetDS = \
+    "mov ax, ds" \
+    parm [] nomemory \
+    value [ax] \
+    modify exact [ax] nomemory;
+#endif
+
+#undef      ASMGetES
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetES = \
+    "mov ax, es" \
+    parm [] nomemory \
+    value [ax] \
+    modify exact [ax] nomemory;
+#endif
+
+#undef      ASMGetFS
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetFS = \
+    ".386" \
+    "mov ax, fs" \
+    parm [] nomemory \
+    value [ax] \
+    modify exact [ax] nomemory;
+#endif
+
+#undef      ASMGetGS
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetGS = \
+    ".386" \
+    "mov ax, gs" \
+    parm [] nomemory \
+    value [ax] \
+    modify exact [ax] nomemory;
+#endif
+
+#undef      ASMGetSS
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetSS = \
+    "mov ax, ss" \
+    parm [] nomemory \
+    value [ax] \
+    modify exact [ax] nomemory;
+#endif
+
+#undef      ASMGetTR
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetTR = \
+    ".286" \
+    "str ax" \
+    parm [] nomemory \
+    value [ax] \
+    modify exact [ax] nomemory;
+#endif
+
+#undef      ASMGetLDTR
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetLDTR = \
+    ".286" \
+    "sldt ax" \
+    parm [] nomemory \
+    value [ax] \
+    modify exact [ax] nomemory;
+#endif
+
+/** @todo ASMGetSegAttr   */
+
+#undef      ASMGetFlags
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetFlags = \
+    "pushf" \
+    "pop ax" \
+    parm [] nomemory \
+    value [ax] \
+    modify exact [ax] nomemory;
+#endif
+
+#undef      ASMSetFlags
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetFlags = \
+    "push ax" \
+    "popf" \
+    parm [ax] nomemory \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMChangeFlags
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMChangeFlags = \
+    "pushf" \
+    "pop ax" \
+    "and dx, ax" \
+    "or  dx, cx" \
+    "push dx" \
+    "popf" \
+    parm [dx] [cx] nomemory \
+    value [ax] \
+    modify exact [dx] nomemory;
+#endif
+
+#undef      ASMAddFlags
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMAddFlags = \
+    "pushf" \
+    "pop ax" \
+    "or  dx, ax" \
+    "push dx" \
+    "popf" \
+    parm [dx] nomemory \
+    value [ax] \
+    modify exact [dx] nomemory;
+#endif
+
+#undef      ASMClearFlags
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMClearFlags = \
+    "pushf" \
+    "pop ax" \
+    "and dx, ax" \
+    "push dx" \
+    "popf" \
+    parm [dx] nomemory \
+    value [ax] \
+    modify exact [dx] nomemory;
+#endif
+
+/* Note! Must use the 64-bit integer return value convension.
+         The order of registers in the value [set] does not seem to mean anything. */
+#undef      ASMReadTSC
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMReadTSC = \
+    ".586" \
+    "rdtsc" \
+    "mov ebx, edx" \
+    "mov ecx, eax" \
+    "shr ecx, 16" \
+    "xchg eax, edx" \
+    "shr eax, 16" \
+    parm [] nomemory \
+    value [dx cx bx ax] \
+    modify exact [ax bx cx dx] nomemory;
+#endif
+
+/** @todo ASMReadTscWithAux if needed (rdtscp not recognized by compiler)   */
+
+
+/* ASMCpuId: Implemented externally, too many parameters. */
+/* ASMCpuId_Idx_ECX: Implemented externally, too many parameters. */
+/* ASMCpuIdExSlow: Always implemented externally. */
+/* ASMCpuId_ECX_EDX: Implemented externally, too many parameters. */
+
+#undef      ASMCpuId_EAX
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMCpuId_EAX = \
+    ".586" \
+    "xchg ax, dx" \
+    "shl eax, 16" \
+    "mov ax, dx" \
+    "cpuid" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [ax dx] \
+    value [ax dx] \
+    modify exact [ax bx cx dx];
+#endif
+
+#undef      ASMCpuId_EBX
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMCpuId_EBX = \
+    ".586" \
+    "xchg ax, dx" \
+    "shl eax, 16" \
+    "mov ax, dx" \
+    "cpuid" \
+    "mov ax, bx" \
+    "shr ebx, 16" \
+    parm [ax dx] \
+    value [ax bx] \
+    modify exact [ax bx cx dx];
+#endif
+
+#undef      ASMCpuId_ECX
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMCpuId_ECX = \
+    ".586" \
+    "xchg ax, dx" \
+    "shl eax, 16" \
+    "mov ax, dx" \
+    "cpuid" \
+    "mov ax, cx" \
+    "shr ecx, 16" \
+    parm [ax dx] \
+    value [ax cx] \
+    modify exact [ax bx cx dx];
+#endif
+
+#undef      ASMCpuId_EDX
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMCpuId_EDX = \
+    ".586" \
+    "xchg ax, dx" \
+    "shl eax, 16" \
+    "mov ax, dx" \
+    "cpuid" \
+    "mov ax, dx" \
+    "shr edx, 16" \
+    parm [ax dx] \
+    value [ax dx] \
+    modify exact [ax bx cx dx];
+#endif
+
+/* ASMHasCpuId: MSC inline in main source file. */
+/* ASMGetApicId: Implemented externally, lazy bird. */
+
+/* Note! Again, when returning two registers, watcom have certain fixed ordering rules (low:high):
+            ax:bx, ax:cx, ax:dx, ax:si, ax:di
+            bx:cx, bx:dx, bx:si, bx:di
+            dx:cx, si:cx, di:cx
+            si:dx, di:dx
+            si:di
+         This ordering seems to apply to parameter values too. */
+#undef      ASMGetCR0
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetCR0 = \
+    ".386" \
+    "mov eax, cr0" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [] nomemory \
+    value [ax dx] \
+    modify exact [ax dx] nomemory;
+#endif
+
+#undef      ASMSetCR0
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetCR0 = \
+    ".386" \
+    "shl edx, 16" \
+    "mov dx, ax" \
+    "mov cr0, edx" \
+    parm [ax dx] nomemory \
+    modify exact [dx] nomemory;
+#endif
+
+#undef      ASMGetCR2
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetCR2 = \
+    ".386" \
+    "mov eax, cr2" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [] nomemory \
+    value [ax dx] \
+    modify exact [ax dx] nomemory;
+#endif
+
+#undef      ASMSetCR2
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetCR2 = \
+    ".386" \
+    "shl edx, 16" \
+    "mov dx, ax" \
+    "mov cr2, edx" \
+    parm [ax dx] nomemory \
+    modify exact [dx] nomemory;
+#endif
+
+#undef      ASMGetCR3
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetCR3 = \
+    ".386" \
+    "mov eax, cr3" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [] nomemory \
+    value [ax dx] \
+    modify exact [ax dx] nomemory;
+#endif
+
+#undef      ASMSetCR3
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetCR3 = \
+    ".386" \
+    "shl edx, 16" \
+    "mov dx, ax" \
+    "mov cr3, edx" \
+    parm [ax dx] nomemory \
+    modify exact [dx] nomemory;
+#endif
+
+#undef      ASMReloadCR3
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMReloadCR3 = \
+    ".386" \
+    "mov eax, cr3" \
+    "mov cr3, eax" \
+    parm [] nomemory \
+    modify exact [ax] nomemory;
+#endif
+
+#undef      ASMGetCR4
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetCR4 = \
+    ".386" \
+    "mov eax, cr4" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [] nomemory \
+    value [ax dx] \
+    modify exact [ax dx] nomemory;
+#endif
+
+#undef      ASMSetCR4
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetCR4 = \
+    ".386" \
+    "shl edx, 16" \
+    "mov dx, ax" \
+    "mov cr4, edx" \
+    parm [ax dx] nomemory \
+    modify exact [dx] nomemory;
+#endif
+
+/* ASMGetCR8: Don't bother for 16-bit. */
+/* ASMSetCR8: Don't bother for 16-bit. */
+
+#undef      ASMIntEnable
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMIntEnable = \
+    "sti" \
+    parm [] nomemory \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMIntDisable
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMIntDisable = \
+    "cli" \
+    parm [] nomemory \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMIntDisableFlags
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMIntDisableFlags = \
+    "pushf" \
+    "cli" \
+    "pop ax" \
+    parm [] nomemory \
+    value [ax] \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMHalt
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMHalt = \
+    "hlt" \
+    parm [] nomemory \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMRdMsr
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMRdMsr = \
+    ".586" \
+    "shl ecx, 16" \
+    "mov cx, ax" \
+    "rdmsr" \
+    "mov ebx, edx" \
+    "mov ecx, eax" \
+    "shr ecx, 16" \
+    "xchg eax, edx" \
+    "shr eax, 16" \
+    parm [ax cx] nomemory \
+    value [dx cx bx ax] \
+    modify exact [ax bx cx dx] nomemory;
+#endif
+
+/* ASMWrMsr: Implemented externally, lazy bird. */
+/* ASMRdMsrEx: Implemented externally, lazy bird. */
+/* ASMWrMsrEx: Implemented externally, lazy bird. */
+
+#undef      ASMRdMsr_Low
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMRdMsr_Low = \
+    ".586" \
+    "shl ecx, 16" \
+    "mov cx, ax" \
+    "rdmsr" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [ax cx] nomemory \
+    value [ax dx] \
+    modify exact [ax bx cx dx] nomemory;
+#endif
+
+#undef      ASMRdMsr_High
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMRdMsr_High = \
+    ".586" \
+    "shl ecx, 16" \
+    "mov cx, ax" \
+    "rdmsr" \
+    "mov eax, edx" \
+    "shr edx, 16" \
+    parm [ax cx] nomemory \
+    value [ax dx] \
+    modify exact [ax bx cx dx] nomemory;
+#endif
+
+
+#undef      ASMGetDR0
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetDR0 = \
+    ".386" \
+    "mov eax, dr0" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [] nomemory \
+    value [ax dx] \
+    modify exact [ax dx] nomemory;
+#endif
+
+#undef      ASMGetDR1
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetDR1 = \
+    ".386" \
+    "mov eax, dr1" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [] nomemory \
+    value [ax dx] \
+    modify exact [ax dx] nomemory;
+#endif
+
+#undef      ASMGetDR2
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetDR2 = \
+    ".386" \
+    "mov eax, dr2" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [] nomemory \
+    value [ax dx] \
+    modify exact [ax dx] nomemory;
+#endif
+
+#undef      ASMGetDR3
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetDR3 = \
+    ".386" \
+    "mov eax, dr3" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [] nomemory \
+    value [ax dx] \
+    modify exact [ax dx] nomemory;
+#endif
+
+#undef      ASMGetDR6
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetDR6 = \
+    ".386" \
+    "mov eax, dr6" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [] nomemory \
+    value [ax dx] \
+    modify exact [ax dx] nomemory;
+#endif
+
+#undef      ASMGetAndClearDR6
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetAndClearDR6 = \
+    ".386" \
+    "mov edx, 0ffff0ff0h" \
+    "mov eax, dr6" \
+    "mov dr6, edx" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [] nomemory \
+    value [ax dx] \
+    modify exact [ax dx] nomemory;
+#endif
+
+#undef      ASMGetDR7
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMGetDR7 = \
+    ".386" \
+    "mov eax, dr7" \
+    "mov edx, eax" \
+    "shr edx, 16" \
+    parm [] nomemory \
+    value [ax dx] \
+    modify exact [ax dx] nomemory;
+#endif
+
+#undef      ASMSetDR0
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetDR0 = \
+    ".386" \
+    "shl edx, 16" \
+    "mov dx, ax" \
+    "mov dr0, edx" \
+    parm [ax dx] nomemory \
+    modify exact [dx] nomemory;
+#endif
+
+#undef      ASMSetDR1
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetDR1 = \
+    ".386" \
+    "shl edx, 16" \
+    "mov dx, ax" \
+    "mov dr1, edx" \
+    parm [ax dx] nomemory \
+    modify exact [dx] nomemory;
+#endif
+
+#undef      ASMSetDR2
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetDR2 = \
+    ".386" \
+    "shl edx, 16" \
+    "mov dx, ax" \
+    "mov dr2, edx" \
+    parm [ax dx] nomemory \
+    modify exact [dx] nomemory;
+#endif
+
+#undef      ASMSetDR3
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetDR3 = \
+    ".386" \
+    "shl edx, 16" \
+    "mov dx, ax" \
+    "mov dr3, edx" \
+    parm [ax dx] nomemory \
+    modify exact [dx] nomemory;
+#endif
+
+#undef      ASMSetDR6
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetDR6 = \
+    ".386" \
+    "shl edx, 16" \
+    "mov dx, ax" \
+    "mov dr6, edx" \
+    parm [ax dx] nomemory \
+    modify exact [dx] nomemory;
+#endif
+
+#undef      ASMSetDR7
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMSetDR7 = \
+    ".386" \
+    "shl edx, 16" \
+    "mov dx, ax" \
+    "mov dr7, edx" \
+    parm [ax dx] nomemory \
+    modify exact [dx] nomemory;
+#endif
+
+/* Yeah, could've used outp here, but this keeps the main file simpler. */
+#undef      ASMOutU8
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMOutU8 = \
+    "out dx, al" \
+    parm [dx] [al] nomemory \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMInU8
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMInU8 = \
+    "in al, dx" \
+    parm [dx] nomemory \
+    value [al] \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMOutU16
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMOutU16 = \
+    "out dx, ax" \
+    parm [dx] [ax] nomemory \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMInU16
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMInU16 = \
+    "in ax, dx" \
+    parm [dx] nomemory \
+    value [ax] \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMOutU32
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMOutU32 = \
+    ".386" \
+    "shl ecx, 16" \
+    "mov cx, ax" \
+    "mov eax, ecx" \
+    "out dx, eax" \
+    parm [dx] [ax cx] nomemory \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMInU32
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMInU32 = \
+    ".386" \
+    "in eax, dx" \
+    "mov ecx, eax" \
+    "shr ecx, 16" \
+    parm [dx] nomemory \
+    value [ax cx] \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMOutStrU8
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMOutStrU8 = \
+    ".186" \
+    "mov ax, ds" \
+    "mov ds, di" \
+    "rep outsb" \
+    "mov ds, ax" \
+    parm [dx] [si di] [cx] nomemory \
+    modify exact [si cx ax] nomemory;
+#endif
+
+#undef      ASMInStrU8
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMInStrU8 = \
+    ".186" \
+    "rep insb" \
+    parm [dx] [di es] [cx] \
+    modify exact [di cx];
+#endif
+
+#undef      ASMOutStrU16
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMOutStrU16 = \
+    ".186" \
+    "mov ax, ds" \
+    "mov ds, di" \
+    "rep outsw" \
+    "mov ds, ax" \
+    parm [dx] [si di] [cx] nomemory \
+    modify exact [si cx ax] nomemory;
+#endif
+
+#undef      ASMInStrU16
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMInStrU16 = \
+    ".186" \
+    "rep insw" \
+    parm [dx] [di es] [cx] \
+    modify exact [di cx];
+#endif
+
+#undef      ASMOutStrU32
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMOutStrU32 = \
+    ".386" \
+    "mov ax, ds" \
+    "mov ds, di" \
+    "rep outsd" \
+    "mov ds, ax" \
+    parm [dx] [si di] [cx] nomemory \
+    modify exact [si cx ax] nomemory;
+#endif
+
+#undef      ASMInStrU32
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMInStrU32 = \
+    ".386" \
+    "rep insd" \
+    parm [dx] [es di] [cx] \
+    modify exact [di cx];
+#endif
+
+#undef ASMInvalidatePage
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMInvalidatePage = \
+    ".486" \
+    "shl edx, 16" \
+    "mov dx, ax" \
+    "invlpg [edx]" \
+    parm [ax dx] \
+    modify exact [dx];
+#endif
+
+#undef      ASMWriteBackAndInvalidateCaches
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMWriteBackAndInvalidateCaches = \
+    ".486" \
+    "wbinvd" \
+    parm [] nomemory \
+    modify exact [] nomemory;
+#endif
+
+#undef      ASMInvalidateInternalCaches
+#ifdef IPRT_ASM_AMD64_X86_WATCOM_16_INSTANTIATE
+#pragma aux ASMInvalidateInternalCaches = \
+    ".486" \
+    "invd" \
+    parm [] \
+    modify exact [];
+#endif
+
+#endif /* !IPRT_INCLUDED_asm_amd64_x86_watcom_16_h */
+