Recent content by Snial

Interesting. At first I was confusing it with the 5260, whose display is limited to 640x480 and was the reason I bought a PM4400 instead, in 1996. And there's no corresponding 5360. Instead, the 5400 and 5500 kept the 52xx and 5300. Oh no, I've just been looking through EveryMac.com at all the...

@superjer2000 . The thing to note about a Sinclair ZX Spectrum is, of course, that it's really a 1bpp bitmap system with a 32x24 character resolution, colour attribute overlay. The Bitmap video is at address 0x4000 and the colour attribute overlay is at address 0x5800. Thus the primary...

'tis always the way. The principle of locality usually holds true, which means that most computation takes place locally. So a faster CPU with larger L1 and L2 caches improves performance. However, the big shift towards processing masses of media over the past few decades pushes the performance...

I'm actually very similar. I'd stuff a 5V, 8-bit AVR into anything I could. Partly, because I think like you it seems incongruous to design a peripheral that's far more powerful than the host. Anyway, sometimes I do use 8-bit PICs, here's the dumbest project I ever did, a PIC programmer built...

Well done! And... you didn't use an 8-bit PIC :-) ? I am doubly impressed!

For fun I wrote a version of DumbDD in THINK C 5. It's <4kB and fairly crude. I transcribed the Forth routines from MacTech I linked earlier, but I have almost certainly made mistakes. I tried it on miniVMac with the actual SCSI writes blocked out (and a delay of 2/60ths of second between each...

OK, no worries! The DumbDD thread is the best route then and there's an alpha-quality app for it!

and (@jjuran ) does MacRelix have dd built-in? Would it be able to copy a raw .iso file to a SCSI device (e.g. the equivalent of dd if=myIso.iso of=/dev/sda0 )?

Except it'd be {0x39, 0x38} =14,648. So, 65535 => (65535-14648)/10000+9.8=14.8.8b9. Whoops, I had managed to make two mistakes! Now you only get 1 build digit, but you gain 3 feature and 1 bug-fix versions.

Hmmm. This has just set me thinking. My original Performa 400 came with 7.1p. Are we saying it was actually 7.1.2p, but About This Macintosh.. just displayed "7.1P"? I've lost count of the number of companies I've worked at which screwed up version control for embedded products, leading to a...

Aaah, OK. I'd looked at the web page talking about this and then forgot about it. So, perhaps that solves one problem: it results in a merged .iso . In this case, the .iso would be about 1.932GB I think, less than 2GB. Sorry about that. This is from...