[HN Gopher] Tetris Max 2.9.1 and Macintosh System 6.0.8 Bugs
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Tetris Max 2.9.1 and Macintosh System 6.0.8 Bugs
Author : zdw
Score : 47 points
Date : 2023-07-29 03:19 UTC (1 days ago)
(HTM) web link (www.bigmessowires.com)
(TXT) w3m dump (www.bigmessowires.com)
| altairprime wrote:
| (2023)
| mproud wrote:
| Haha, I suppose a person might think this was an old bug report
| drafted from 25 years ago!
| dietrichepp wrote:
| I've been doing some dives into Mac 68K programming recently, and
| ran into the same question--what about color on System 6? Like
| the author, I don't have a Mac which is both color and runs
| System 6.
|
| The old Inside Macintosh volumes are sometimes difficult to
| follow. New features got added to newer system software versions,
| and new features got added to newer ROM versions, and if you want
| to support older Macs, then you sometimes have to search through
| the volumes until you find when a particular feature was
| introduced. (The original Inside Macintosh volumes are organized
| in chronological order, corresponding to major ROM or system
| software updates.) If you just look at the description of one of
| the functions in the OS or toolbox, there's no mention of when it
| was introduced.
|
| I also discovered that despite my efforts to make a program
| compatible with the Mac 128K and 512K, my programs won't run on
| those systems. The 128K and 512K have the very first ROM version,
| with the 64K ROMs, and I suspect that the application startup
| code which ships with CodeWarrior checks for a 64K ROM and aborts
| the program. So even if I'm careful to only use functions that
| are available in the 64K ROM, my program won't run on a 64K ROM
| unless I use a different toolchain or rewrite the startup code.
| azalemeth wrote:
| Naive question: what's wrong with quemu and this emulation
| target?
| duskwuff wrote:
| qemu only supports one 68k Macintosh machine target (the
| Quadra 800), which is too new to run System 6.
| jamesfmilne wrote:
| To target stuff that old I'd try MPW. I used to use Codewarrior
| back in the day, but these days I prefer MPW, as its more like
| developing on modern macOS/Linux.
| dietrichepp wrote:
| That's a good suggestion--I decided not to use MPW because
| the CodeWarrior compilers are better, the CodeWarrior UX is
| better, etc. For now, I'd rather drop 128K support and keep
| using CodeWarrior. The binaries work just fine on Macs with
| the 128K ROM (like the Mac Plus), and there are a number of
| additional difficulties you face when developing for 64K
| ROMs.
|
| Some of the other difficulties--no MaxApplZone, the segment
| manager behaves differently, and if you really want Mac 128K
| support, you have to copy to an MFS formatted disk. Some
| versions of the OS ship with broken MFS implementations,
| presumably because nobody cared whether it worked. I suspect
| that the segment manager behavior is a particularly thorny
| issue because it affects the location of code segments in
| memory, and you have to be careful when you only have 128K.
| Someone wrote:
| Check whether your code gets called by writing a _main_ that
| doesn't use any traps but just loops clearing the screen, fills
| it with black, clears it, etc.
|
| If it doesn't get called, disassemble the startup code. It
| can't be long.
|
| I would use a version of ResEdit that has a built-in
| disassembler (advantage: you won't have to run that on a 512k
| Mac, but can use a beefier one or an emulator)
|
| You also may want to use the earliest version of CodeWarrior
| you can find, as support for System 6 may have stopped at some
| time.
| dietrichepp wrote:
| CodeWarrior ships with the source code for the startup code,
| but it is unfortunately somewhat long.
| anthk wrote:
| Check jcs's site. He writes unix/openbsd related code but it
| has a section on System6 programming. https://jcs.org/system6c
| Also, telnet to klud [DOT] ge to test his BBS hosted in a
| System 6 machine.
| yyyk wrote:
| I wonder how well this would have run with Ardi. I used to run a
| few older Mac games on it without serious issues some years ago.
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