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I didn't know that, but if it's the case, then I guess it's because it only has a 68020. But that can be fixed by adding the MMU, right? I may still have it at my Dad's house somewhere. We thought it was special. The layout of the labs was: ----+----------+---------------+----------+--- ...

I guess many people on the 68KMLA haven't even used the Mac II. I first heard about it through Personal Computer World (UK) in April 1987: The artist took a ray-traced image and extended it to the edges of the magazine. Then PCW also packed an A2-sized poster (folded 4x) in the magazine with...

It's amazing how one encounters cognitive hurdles (mostly abstractions) when learning new languages. First computer (aged 12-13, 1980-1981): ZX80. Personal Computer World listed a ZX80 "Duck Shoot" reaction game, which contained some machine code to pause the screen until a key was pressed. On...

Can anyone help me here? I wanted to play around with a bit of Swift and SwiftUI (because that's what Apple are promoting). I've read quite a bit in the documentation and watched a few videos, but frankly there's something I'm not getting about declarative UIs. Here's some code that illustrates...

LOL! I like AARCH32 assembly as well as Thumb, but my favourite still has to be Motorola 68000 (though I quite like MSP430 for the simplicity). All of these trace their ancestry back to the 6502, 6800 which in turn derive from the pdp-8 and pdp-11; which may also be inspired by the MIT...

That sounds amazing, like the inverse concept of the on-disk New World ROM with OF chip-ROM!! I guess it'll work on my PB1400c? I've done a lot of Z80, 68000, 8086, ARM(Cortex) assembly and PPC asm scares me too! The real problem for me is that the mnemonics are all a bit mad: random lengths...

I didn't know that. I knew that there were debates in the Houses of Parliament after the TV show "The Mighty Micro" was aired, on ITV (at the time, only 3 TV channels in the UK). https://en.wikipedia.org/wiki/BBC_Micro#History Although the UK never had minitel, there are probably a few more...

So, just to recap (sic). If I get 250ml of IPA from trade-chem.co.uk for £5.99 I can use a microfibre cloth (from a spec-saver's glasses case) to clean it? https://trade-chem.co.uk/liquids/isopropanol-alcohol-printer-cleaner/ Is it OK to use cotton-buds instead, or is there too much of a...

Great, I've just read it in French and understood it all! Fantastic sleuthing! I realise you've not yet managed to trigger the Easter egg, so it still remains as an image within PowerPC Enabler 1.1. It's really great to get a bit practice in French!

Part of the fun of this thread is finding the quirks in the 603 and P5200 specs. The 32-bit/64-bit hardware bus select is a good reminder though. Good point, it was a 68030-style PDS. It's OK, I've misunderstood a few things here - at least once I've gone back & repeated a previous...

Can you actually run System 1.0 to 7.5.3 on a 68010? Some instructions are privileged, like MOVE SR,dn; whereas they're not on the 68000. OTOH, the Mac's 68000 was always in Supervisor mode.

Hmm, but now I'm thinking it's quite hard to get standard bench tests onto it, so .. maybe not!

SpecInt92 and SpecFP92 (as well as Spec89) were measured against the VAX 11/780 which was defined to have a performance of 1 MIP (though in fact it was less than that). And for those not familiar, the VAX 11/780 was an early 32-bit Super-minicomputer developed at the end of the 1970s, around the...

I've just been reading the review of the IBM PC here: https://archive.org/details/BYTE-MAGAZINE-COMPLETE/198201_Byte_Magazine_Vol_07-01_The_IBM_Personal_Computer/page/60/mode/2up It focusses almost exclusively on the actual features of the PC rather than potential expansion. I haven't read...

I'm aware of it. It's possible it failed because (a) IBM didn't care much about small computers (b) The starting price of $9K was more expensive than many minicomputers of the day (c) it wasn't the right moment. I'm really just going on how the IBM PC was portrayed in its earliest years, up to...

Thanks. Yep (but here you're agreeing with me, and now I'm agreeing with you agreeing with me ;-) )! Right and this explains how ARM started out and expanded its market too. As a recap for those who don't know (which probably doesn't include @adespoton , but might include some reader of this...

I guess you never had a ZX Spectrum then ;-) Hmm, clever indeed! I always thought PDS was a good idea!

I guess that because the PM6100/60 bus speed and CPU scale in proportion (30MHz bus, 60MHz CPU), Quake will scale proportionally too. This implies Quake on such a machine would run at 7.5fps, a new record low! (P5200 at 75MHz/Mac OS 8.5 = 7.9fps).

The papers @noglin linked to earlier explains the design decision for the split I/D 8kB cache. For normal software it really is better than 16kB unified. The 603 team anticipated a 100% native PPC Mac OS from the start, because Tesseract was the primary PPC Mac project until March 1993 when it...

Curious, since it has pretty much the same graphics chip. So, it could be that the PPC 603 cache stalling issue you've been looking at makes it that 16% slower. OTOH, because it's testing QD graphics routines (isn't it?), then lots of small graphics operations will have a higher 68K overhead for...