From 9728739524c65142a09857ae6c0907a79776d163 Mon Sep 17 00:00:00 2001
From: Misutaa Urufu <8140068+MisutaaUrufu@users.noreply.github.com>
Date: Sat, 31 Jul 2021 11:43:56 -0500
Subject: [PATCH 1/3] Add Increased Memory Support

Code taken from https://www.vogons.org/viewtopic.php?p=658464#p658464, as part of the DOSBOX SVN fork.
---
 dosbox/src/ints/bios.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/dosbox/src/ints/bios.cpp b/dosbox/src/ints/bios.cpp
index a61bfe5d..07bc6dc4 100644
--- a/dosbox/src/ints/bios.cpp
+++ b/dosbox/src/ints/bios.cpp
@@ -790,6 +790,26 @@ static Bitu INT15_Handler(void) {
 		LOG(LOG_BIOS,LOG_NORMAL)("INT15:Function %X called, bios mouse not supported",reg_ah);
 		CALLBACK_SCF(true);
 		break;
+	case 0xe8:
+            switch (reg_al) {
+                case 0x01: { /* E801: memory size */
+                    Bitu sz = MEM_TotalPages()*4;
+                    if (sz >= 1024) sz -= 1024;
+                    else sz = 0;
+                    reg_ax = reg_cx = (sz > 0x3C00) ? 0x3C00 : sz; /* extended memory between 1MB and 16MB in KBs */
+                    sz -= reg_ax;
+                    sz /= 64;    /* extended memory size from 16MB in 64KB blocks */
+                    if (sz > 65535) sz = 65535;
+                    reg_bx = reg_dx = sz;
+                    CALLBACK_SCF(false);
+                }
+                    break;
+                default:
+                    LOG(LOG_BIOS,LOG_ERROR)("INT15:Unknown call %4X",reg_ax);
+                    reg_ah=0x86;
+                    CALLBACK_SCF(true);
+            }
+            break;
 	default:
 		LOG(LOG_BIOS,LOG_ERROR)("INT15:Unknown call %4X",reg_ax);
 		reg_ah=0x86;

From f4edd0798e26654cabc126b9fee704a527a47b25 Mon Sep 17 00:00:00 2001
From: Misutaa Urufu <8140068+MisutaaUrufu@users.noreply.github.com>
Date: Sat, 31 Jul 2021 11:45:49 -0500
Subject: [PATCH 2/3] 256MB Support

Increase supported memsize to 256MB
---
 dosbox/src/dosbox.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dosbox/src/dosbox.cpp b/dosbox/src/dosbox.cpp
index 917b3c0d..99228ccc 100644
--- a/dosbox/src/dosbox.cpp
+++ b/dosbox/src/dosbox.cpp
@@ -426,7 +426,7 @@ void DOSBOX_Init(void) {
 	secprop->AddInitFunction(&MEM_Init);//done
 	secprop->AddInitFunction(&HARDWARE_Init);//done
 	Pint = secprop->Add_int("memsize", Property::Changeable::WhenIdle,16);
-	Pint->SetMinMax(1,63);
+	Pint->SetMinMax(1,256);
 	Pint->Set_help(
 		"Amount of memory DOSBox has in megabytes.\n"
 		"  This value is best left at its default to avoid problems with some games,\n"

From 275c621b573c383057c34288faf0540d9fbbb04b Mon Sep 17 00:00:00 2001
From: Misutaa Urufu <8140068+MisutaaUrufu@users.noreply.github.com>
Date: Sat, 31 Jul 2021 11:46:51 -0500
Subject: [PATCH 3/3] 256MB Support

Increase supported memsize to 256MB
---
 dosbox/src/hardware/memory.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dosbox/src/hardware/memory.cpp b/dosbox/src/hardware/memory.cpp
index b03616f3..d88c537c 100644
--- a/dosbox/src/hardware/memory.cpp
+++ b/dosbox/src/hardware/memory.cpp
@@ -29,7 +29,7 @@
 
 #define PAGES_IN_BLOCK	((1024*1024)/MEM_PAGE_SIZE)
 #define SAFE_MEMORY	32
-#define MAX_MEMORY	64
+#define MAX_MEMORY	256
 #define MAX_PAGE_ENTRIES (MAX_MEMORY*1024*1024/4096)
 #define LFB_PAGES	512
 #define MAX_LINKS	((MAX_MEMORY*1024/4)+4096)		//Hopefully enough