Tpasm is a command line based cross assembler for a variety of common
microprocessors and controllers, currently supporting:

	Rockwell 6502 (6502, 65c02)
	Motorola 6805 (6805, 68705), 6809, 68hc11
	Intel 8051 (8031, 8032, 8051, 8052, 80c390)
	Atmel AVR (avt, attiny, at90, atmega series)
	Core Technologies CTXP-1
	Microchip PIC (12xxx, 14xxx, 16xxx, 17xxx series)
	Sunplus SPCxxx series
	Zilog Z80 (z80, z180)

Features include:

  * True multi-pass assembly (will take as many passes as needed)
  * Multiple segments
  * Sophisticated expressions
  * Macros, repeats, conditionals
  * Arbitrary length labels
  * Local labels
  * Supporting new processors is reasonably straightforward
  * Can switch between processors during assembly

WWW: http://www.sqrt.com/