Gloom was definately assembler, as was Guardian.
As Skid commented, mark wrote a few Defenders, one in Blitz 1, the popular one in Blitz ][. and updated one (sort of Stargate++) called Oblivion was in ASM, There was also one short lived ASM version of Defender written in the zero pass assembler that was written in Blitz (ZASM?? The name escapes me).
As Skid commented, mark wrote a few Defenders, one in Blitz 1, the popular one in Blitz ][. and updated one (sort of Stargate++) called Oblivion was in ASM, There was also one short lived ASM version of Defender written in the zero pass assembler that was written in Blitz (ZASM?? The name escapes me).