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Merlin was a macro assembler developed by mathematics professor Glen Bredon, initially running on the Apple II under DOS 3.3, for the 6502 processor. It was published commercially by Southwestern Data Systems, later known as Roger Wagner Publishing. Merlin continued to be updated as successors to the 6502 became available: first the 65C02 and later the 65816 and 65802. A ProDOS version was made available as Merlin Pro (this package also included the DOS 3.3 version). The 8-bit version of Merlin was later renamed Merlin 8, and a 16-bit version, dubbed Merlin 16, was released for the Apple IIgs. Versions for the Commodore 64 and Commodore 128, dubbed Merlin 64 and Merlin 128 respectively, were also released.
Merlin included an integrated source code editor (initially a line editor; later versions included a full-screen editor) and also a disassembler, called Sourceror. A related utility, Sourceror.FP, could generate a commented disassembly of the Apple II's Applesoft BASIC, the source code for which had never been released by Apple, from the customer's own ROM.
- Public.Domain.notice.txt on apple2.org.za
- Re: merlin source code on macgui.com (2005)
- 8-Bit Merlin IDE version 2.59 Source now documented and available on callapple.org (2011)
- Merlin-8 v2.47 (Glen Bredon)(Apple IIe, IIgs) "Semi-official Public Domain Release With Source Codes" (July 20, 2007)
- Peterson, Cheryl (1985-04-01). "Merlin 64". Ahoy!. pp. 26–27. Retrieved 27 June 2014.