MS Dos Commands for Work or Play - Trip down memory lane 

Bet that is hard to use. I love DosBox tho, its really good and fun to use. Love having an old school computer tho 😊😊

@@Dosbite I figure it out that Magic DosBox starts in the 16 bit Big Real Mode/Unreal Mode with a segment size of 4 gb for data segment with ems=true in the config file. That is a nice feature. The official version starts with 64 kb segment size like MS DOS.

I use the routine below to switch into the 16 bit Big Real Mode/Unreal Mode in MS DOS 6.22 with disabled emm386.exe in the config.sys file and within DosBox on a Windows-PC with ems=false in the config file of DosBox together with Debug from Paul Vojta to use 32 bit assembler mnemonics. @echo off REM UNREAL.BAT REM For switching from the 16 bit Real Address mode into 16 bit Unreal-/Big real mode with REM changing the segment size from 64 kb segment size to 4 gb segment size REM for DS, ES, FS, GS segment register, but not CS and SS segment register REM and at last open the 21 address line. echo a>tmp.deb REM -- disable interrupts and NMI -- echo CLI>>tmp.deb echo IN AL,70>>tmp.deb echo OR AL,80>>tmp.deb echo OUT 70,AL>>tmp.deb REM -- calculate addresses -- echo XOR EAX,EAX>>tmp.deb echo MOV AX,CS>>tmp.deb echo MOV [016D],AX>>tmp.deb echo SHL EAX,04>>tmp.deb echo MOV EBX,EAX>>tmp.deb echo MOV [01B2],AX>>tmp.deb echo MOV [01BA],AX>>tmp.deb echo ROR EAX,10>>tmp.deb echo MOV [01B4],AL>>tmp.deb echo MOV [01BC],AL>>tmp.deb echo XOR EAX,EAX>>tmp.deb echo MOV AX,01A8>>tmp.deb echo ADD EBX,EAX>>tmp.deb echo MOV WORD PTR [01A0],27>>tmp.deb echo MOV [01A2],EBX>>tmp.deb echo PUSHF>>tmp.deb echo LGDT [01A0]>>tmp.deb echo MOV DX,SS>>tmp.deb echo MOV EAX,CR0>>tmp.deb echo OR AL,1>>tmp.deb echo MOV CR0,EAX>>tmp.deb echo JMP 0008:0150>>tmp.deb REM -- start protect mode -- echo org 0150>>tmp.deb echo MOV AX,10>>tmp.deb echo MOV SS,AX>>tmp.deb echo MOV AX,18>>tmp.deb echo MOV DS,AX>>tmp.deb echo MOV ES,AX>>tmp.deb echo MOV FS,AX>>tmp.deb echo MOV GS,AX>>tmp.deb echo MOV EAX,CR0>>tmp.deb echo AND EAX,-2>>tmp.deb echo MOV CR0,EAX>>tmp.deb echo JMP 0734:0170>>tmp.deb REM -- switch back to Real mode -- echo org 0170>>tmp.deb echo MOV SS,DX>>tmp.deb echo POPF>>tmp.deb REM -- open address line -- echo XOR CX,CX>>tmp.deb echo IN AL,64>>tmp.deb echo AND AL,2>>tmp.deb echo LOOPNZW 0175>>tmp.deb echo JNZ 0197>>tmp.deb echo MOV AL,D1>>tmp.deb echo OUT 64,AL>>tmp.deb echo XOR CX,CX>>tmp.deb echo IN AL,64>>tmp.deb echo AND AL,2>>tmp.deb echo LOOPNZW 0183>>tmp.deb echo JNZ 0179>>tmp.deb echo MOV AL,DF>>tmp.deb echo OUT 60,AL>>tmp.deb echo XOR CX,CX>>tmp.deb echo IN AL,64>>tmp.deb echo AND AL,2>>tmp.deb echo LOOPNZW 0191>>tmp.deb REM -- enable interrupts and NMI -- echo IN AL,70>>tmp.deb echo AND AL,7F>>tmp.deb echo OUT 70,AL>>tmp.deb echo STI>>tmp.deb echo RET>>tmp.deb REM -- Global descriptor table -- echo org 01A0>>tmp.deb echo DB 0,0,0,0,0,0,0,0>>tmp.deb echo DB 0,0,0,0,0,0,0,0>>tmp.deb REM 01B0 echo DB FF,FF,0,0,0,9A,0,0>>tmp.deb REM 01B8 echo DB FF,FF,0,0,0,92,0,0>>tmp.deb REM 01C0 echo DB FF,FF,0,0,0,92,FF,FF>>tmp.deb echo.>>tmp.deb echo n UNREAL.COM>>tmp.deb echo rcx>>tmp.deb echo C8>>tmp.deb echo wcs:100>>tmp.deb REM - unassemble routine - echo ucs:100 l4F>>tmp.deb echo ucs:150 l1F>>tmp.deb echo ucs:170 l2F>>tmp.deb REM -- Global descriptor table -- echo dcs:1A0 l8>>tmp.deb echo dcs:1A8 l8>>tmp.deb echo dcs:1B0 l8>>tmp.deb echo dcs:1B8 l8>>tmp.deb echo dcs:1C0 l8>>tmp.deb echo q>>tmp.deb debugDEB.INF del tmp.deb UNREAL.COM del UNREAL.COM Hint: In the 16 bit Big Real Mode/Unreal Mode we can use 32 bit addresses like the following instructions for example to copy some bytes from the upper left corner to the center of the screen using the linear frame buffer located in C0000000 in the fourth gigabyte using svga-S3 emulation of DosBox in 800x600x32 resolution with VBE modenumber: 1.) rep DB 67 ; address size prefix movsd ; using ds:esi + es:edi 2.) mov eax,[esi] ; ds:esi 3.) mov [edi],eax ; ds:edi

Oh wow, that sounds good and interesting. Bet your good at that then. Sounds fun. You should have your own website. We have a cool Dos Community on FB that would find that interesting. We have 70k members. Link in bio of video. Sounds awesome 😊👍👍👍💾💾💾💾💾 wish I could program more

@@Dosbite I do not like facebook, but i have the discord app installed. In DOS/DosBox we have a lot of software interrupts with DOS functions and BIOS function of the mainboard and the graphic BIOS that we can use example for to load a file into the memory, or to switch into graphic mode, to get user input from keyboard and mouse.

@@maxmuster7003 That cool Oh cool, that sounds real interesting and cool. Awesome :)

I am not sure if youtube let me post it. CENTER.BAT 6 1b "Hello world!" @echo off REM CENTER.BAT REM Need three parameter (%1 %2 %3) attached. REM Usage: CENTER.BAT row color "TEXT" echo acs:100>tmp.deb echo mov ax,B800>>tmp.deb echo mov es,ax>>tmp.deb echo mov di,%1>>tmp.deb echo mov bx,%1>>tmp.deb echo shl di,7>>tmp.deb echo shl bx,5>>tmp.deb echo add di,bx>>tmp.deb echo cld>>tmp.deb echo mov si,140>>tmp.deb echo lodsb>>tmp.deb echo cmp al,FF>>tmp.deb echo jnz 0117>>tmp.deb echo sub si,141>>tmp.deb echo mov bx,50>>tmp.deb echo mov cx,si>>tmp.deb echo sub bx,si>>tmp.deb echo shr bx,1>>tmp.deb echo shl bx,1>>tmp.deb echo add di,bx>>tmp.deb echo mov ah,%2>>tmp.deb echo mov si,140>>tmp.deb echo lodsb>>tmp.deb echo stosw>>tmp.deb echo dec cx>>tmp.deb echo jnz 0132>>tmp.deb echo ret>>tmp.deb echo org 140>>tmp.deb echo DB "%3", FF>>tmp.deb echo.>>tmp.deb echo n CENTER.COM>>tmp.deb echo rcx>>tmp.deb echo 90>>tmp.deb echo wcs:100>>tmp.deb echo q>>tmp.deb debugnul del tmp.deb CENTER.COM del CENTER.COM

Sounds awesome, oh cool, interesting stuff 😊 thank you

@@Dosbite Please let me know if there is a problem with the batch files.

@@Dosbite I published a Picture to character converter ...please google within quotes There is a download link of a zip file from my google drive with some pictures to display, a start.bat to start and the some more batch files, one with the converter inside. To run the start.bat it need to copy debug inside the folder or a path command that points to debug. To get a new picture from the internet i use a Windows-PC, because on Android i do not know where the file of the picture is stored and paint online is impossible to use with a touch screen. To reduce the colors and to change the picture format i use Pictview, it is a picture viewer for DOS.

@@maxmuster7003 😊👍