RetroVibing: MS-DOS for GenZ

MS DOS DEBUG + Batch File searching for 8×16 character set in memory of DosBox.

Press space for next 16 bytes
Press escape key for exit

Start Batch File with segment and offset address attached. Make sure that the offset address can divided by 16.

Example:
C:>MEMSPY.BAT C000 1A00

@echo off
REM MEMSPY.BAT
REM Display 16 bytes
REM Need two parameter attached
REM for segment and offset: like C000 1700
REM Space = next 16 bytes
REM ESC = Exit

echo a>tmp.deb
echo mov ax,b800>>tmp.deb
echo mov es,ax>>tmp.deb
echo mov bx,%1>>tmp.deb
echo mov si,%2>>tmp.deb
echo cld>>tmp.deb
echo mov ds,bx>>tmp.deb
echo xor di,di>>tmp.deb
echo mov ch,10>>tmp.deb
REM — Output segment address —
echo mov dx,bx>>tmp.deb
echo call 0170>>tmp.deb
echo mov al,3A>>tmp.deb
echo stosb>>tmp.deb
echo inc di>>tmp.deb
REM — Output offset address —
echo mov dx,si>>tmp.deb
echo call 0170>>tmp.deb
echo add di,2>>tmp.deb
REM — Get byte from ds:si —
echo lodsb>>tmp.deb
REM — Output byte —
echo xor dx,dx>>tmp.deb
echo mov ah,al>>tmp.deb
echo mov dh,al>>tmp.deb
echo mov cl,2>>tmp.deb
echo call 0172>>tmp.deb
echo add di,2>>tmp.deb
REM — Output bits —
echo mov dl,ah>>tmp.deb
echo mov cl,8>>tmp.deb
echo mov al,31>>tmp.deb
echo rol dl,1>>tmp.deb
echo test dl,1>>tmp.deb
echo jnz 0141>>tmp.deb
echo mov al,30>>tmp.deb
echo stosb>>tmp.deb
echo inc di>>tmp.deb
echo dec cl>>tmp.deb
echo jnz 0136>>tmp.deb
REM — next row —
echo add di,76>>tmp.deb
echo dec ch>>tmp.deb
echo jnz 0112>>tmp.deb
REM — increase seg address + 64 kb —
echo cmp si,0>>tmp.deb
echo jnz 0157>>tmp.deb
echo add bx,1000>>tmp.deb
REM — get key from keyboard —
echo mov ah,0>>tmp.deb
echo int 16>>tmp.deb
echo cmp al, 1b>>tmp.deb
echo jz 0187>>tmp.deb
echo cmp al,20>>tmp.deb
echo jz 010C>>tmp.deb
echo jmp 0157>>tmp.deb
REM — Subroutine —
REM — Output 4 hex ASCII —
echo org 0170>>tmp.deb
echo mov cl,4>>tmp.deb
echo rol dx,4>>tmp.deb
echo mov al,dl>>tmp.deb
echo and al,F>>tmp.deb
echo cmp al,A>>tmp.deb
echo jb 017F>>tmp.deb
echo add al,7>>tmp.deb
echo add al,30>>tmp.deb
echo stosb>>tmp.deb
echo inc di>>tmp.deb
echo dec cl>>tmp.deb
echo jnz 0172>>tmp.deb
echo ret>>tmp.deb
REM

echo.>>tmp.deb

echo n MEMSPY.COM>>tmp.deb

echo rcx>>tmp.deb

echo 88>>tmp.deb

echo wcs:100>>tmp.deb

echo q>>tmp.deb

debug<tmp.deb>DEB.INF

del tmp.deb
cls

MEMSPY.COM

del MEMSPY.COM