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articles:iicplus_merlin [2017/12/14 15:13] M.G. [Fixing ROM 5X] |
articles:iicplus_merlin [2017/12/14 19:07] (current) M.G. [A Wild Bug Appears] |
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| ===== A Wild Bug Appears ===== | ===== A Wild Bug Appears ===== | ||
| - | Recently, a few members of the "Apple II Enthusiasts" Facebook group discovered a bug, seemingly in ROM 5X for the Apple IIc Plus: The Merlin assembler, specifically the 128K versions 2.58 and 2.59, would crash at the main menu when ROM 5X was installed, but worked fine with the stock Apple ROM. | + | Recently, "Apple II Enthusiasts" Facebook group members Skander Ben Abdelkrim, Eric Leung, and Wyatt Wong reported a bug, seemingly in ROM 5X for the Apple IIc Plus: The Merlin assembler, specifically the 128K versions 2.58 and 2.59, would crash at the main menu when ROM 5X was installed, but worked fine with the stock Apple ROM. |
| This had me a bit perplexed, as I ran through possibilities in my head. After booting a copy of [[http://mirrors.apple2.org.za/ftp.apple.asimov.net/images/programming/assembler/merlin/Merlin-8%20v2.58%20%28ProDOS%29%20Disk%201-2.dsk|Merlin 2.58]] in an emulator and looking at its normal behavior, I had a place to start - the crash was happening immediately after the prompt was displayed at the main menu. | This had me a bit perplexed, as I ran through possibilities in my head. After booting a copy of [[http://mirrors.apple2.org.za/ftp.apple.asimov.net/images/programming/assembler/merlin/Merlin-8%20v2.58%20%28ProDOS%29%20Disk%201-2.dsk|Merlin 2.58]] in an emulator and looking at its normal behavior, I had a place to start - the crash was happening immediately after the prompt was displayed at the main menu. | ||
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| There are plenty of programs that copy the ROM into RAM in order to modify it or make use of the routines in a non-standard memory configuration. That's what's going on here. | There are plenty of programs that copy the ROM into RAM in order to modify it or make use of the routines in a non-standard memory configuration. That's what's going on here. | ||
| - | Apple probably hit this problem early on in testing, perhaps noting an odd crash in a popular assembler. | + | Apple's engineers probably hit this problem early on in testing the IIc Plus, perhaps noting an odd crash in a popular assembler. |