IBM PC 5150

Boots an IBM PC/XT (Intel 8088) running GlaBIOS, which loads DOS from drive A: to the A:\> prompt. Click the screen, then type at the DOS prompt (try DIR, then VER). Add ?debug, or click Debug, to inspect the live 8088 registers, read physical memory, disassemble, and single-step. Step here is a TRUE one-instruction step (MartyPC has a native single-instruction debugger step), unlike the burst step of a JIT core.

Boots the IBM PC (Model 5150) straight to IBM Cassette BASIC ("The IBM Personal Computer Basic ... Ok"). Type BASIC directly (e.g. 10 PRINT"HELLO":GOTO 10, then RUN). Add ?debug, or open the debugger, to single-step the 8088 and set breakpoints. Click the screen first so it captures the keyboard.