Recent content by jjuran

Dark Castle and Beyond Dark Castle write directly to the sound buffer, so the Sound Driver's four-tone channels don't apply.

How? Is there a program to do this?

They're not. The code I wrote never calls GetMMUMode() on a 64K (or 128K) ROM, and even if it did, it would merely return garbage because it's just a memory read, not a trap call. See below. ROM85 can have three values: 0xFFFF in the 64K ROM, 0x7FFF in a 128K+ ROM without Color QuickDraw...

Oops. I recalled that _StripAddress takes its parameter in D0 and returns its result in D0, forgetting that StripAddress() takes a void* and returns Ptr. Adding the appropriate casts is left as an exercise. Using StripAddress() in this way is only slightly better than calling Gestalt(). It...

Please forgive the semantic digression that follows. MacPaint and QuickDraw weren't released — they were exhibited. (If the distinction is unclear, ask any resident of a zoo.) The QuickDraw code is not free, at least not in any way that benefits me or my users. I don't ever look at it, for...

At the first MacHack I attended, the keynote speaker was Eric Raymond, touting the benefits of open source. At the "Apple Handshake" session, I inquired about the possibility of releasing the code of HyperCard, only to be met with this dismissal from Steven Glass: "Open source will not be a...

You mean like this? https://www.v68k.org/ams/

typedef UInt32 Bool32; inline Bool32 In32BitMode() { return StripAddress(0xFF000000); }

I use 3x menu blinks. :-) A better tell for a reset PRAM would be the clock. Any time before 1984 is a dead giveaway. Related: I wrote this for a client a few years ago: https://github.com/jjuran/metamage_1/blob/master/mac/hacks/TimeyWimey/TimeyWimey.c

I like having builds automated from the command line, so I use Rez. For example, here's the master build script for the Legacynth installer: https://github.com/jjuran/metamage_1/blob/master/apps/mac/Legacynth/bin/mksea.sh

Mac OS APIs are full of structs with 32-bit members that are only 16-bit aligned. For example, the parID field of FSSpec and portBits.baseAddr of GrafPort. (I think you were clear on this, but in case I confused anyone else, I was talking about emulating 68K code on a little-endian host.)

thinks for a minute Okay, that's pretty clever. :-) Though I'm curious if that would still work on a 32-bit architecture with only 16-bit alignment (e.g. 68K). On a little-endian host, $"0102 0304 0506 0708" would be stored $"0403 0201 0807 0605". If you read a 32-bit value from $1002, that...

That's how the software cursor works. A copy of the cursor image is kept around offscreen, as is a save buffer for pixels overwritten by the onscreen cursor. (Whether either image is cached in VRAM is an implementation detail that's opaque to me as a Mac OS user and irrelevant to my emulator —...

Is the source code public?

Even if the sprite is too shallow, you could limit it to black-and-white cursors — which is most of them. A more significant limitation would be the lack of XOR mode in the blitter, used in the I-beam cursor for example. It's not out of the question. Here's a proof of concept for how it...