The PC-88 version was never a direct port. Because the hardware lacked the scrolling capabilities of the NES, the game played one screen at a time. When Mario reached the edge, the screen would cut to black and load the next section. This "flicker-screen" style made precise platforming nearly impossible and killed the momentum that made Mario famous. Furthermore, the limited color palette and slow processor meant the original ROM felt sluggish and visually muddy. Finding a "Better" Experience
Released alongside the PC-88 version, the X1 version is widely considered superior. It uses all eight colors (including green for pipes), features smoother "Zelda-style" screen transitions instead of black screens, and supports gamepads via the Joy Card peripheral. Super Mario Bros Special Pc 88 Rom BETTER
For the ultimate experience, check for ROM hacks that alter the original game files. The PC-88 version was never a direct port