That's how I learnt x86 assembly using MS-DOS and "debug" - which was a program that came with DOS. The proper assemblers at that time were Microsoft's MASM and

That's how I learnt x86 assembly using MS-DOS and "debug" - which was a program that came with DOS. The proper assemblers at that time were Microsoft's MASM and Borland's TASM. With no access to those, the only option was to use the one bundled in DOS. Fun times, where you had to compute relative addresses of JMPs, based on the address where the JMP instruction sat. And then, you could even write to a particular cylinder/sector/offset on the hard disk and replace the boot sector with your own code.