WLA DX has stagnated a lot recently but there has been progress since the last time (November 2006). WLA DX is a Macro Assembler Package for GB-Z80/Z80/6502/65C02/6510/65816/HUC6280/SPC-700 and was written by Ville Helin.

Changes:

– data filtering macros (looks useful for non-standard string encoding)
– Mersenne Twister random numbers (not that you’d use them much at compile-time)
– Label and line number bugfixes

http://www.smspower.org/forums/viewtopic.php?t=11049