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Forum: Nostalgia & memories Yesterday, 10:24
Replies: 27
Views: 644
Posted By Bruce Abbott
About 6 years ago when moving house I threw out a...

About 6 years ago when moving house I threw out a working A600 with Viper630 because the keys were yellowed, and two faulty CD32s that probably could have been repaired. However I did keep my A1200...
Forum: Coders. General 05 May 2021, 21:37
Replies: 13
Views: 441
Posted By Bruce Abbott
What happens if you make the height 64?

What happens if you make the height 64?
Forum: Coders. General 05 May 2021, 21:30
Replies: 76
Views: 3,853
Posted By Bruce Abbott
You have discovered one of the nice things about...

You have discovered one of the nice things about 68k code - most of the time there is little to gain from 'optimizing' for the 020 and 030. This is good because it means you can concentrate on...
Forum: Nostalgia & memories 05 May 2021, 21:02
Replies: 57
Views: 2,858
Posted By Bruce Abbott
It was the same problem on the Amiga too. Some...

It was the same problem on the Amiga too. Some games were 'cracked' and distributed even before the official release! The sales life of games was short, so they had to be developed quickly and...
Forum: Amiga scene 02 May 2021, 10:49
Replies: 19
Views: 1,278
Posted By Bruce Abbott
Gary Kildall was streets ahead of Microsoft, who...

Gary Kildall was streets ahead of Microsoft, who stole his idea? The truth is rather different.

CP/M (https://en.wikipedia.org/wiki/CP/M#MS-DOS_takes_over)


Microsoft didn't 'steal' anything...
Forum: Hardware mods 01 May 2021, 04:21
Replies: 36
Views: 2,826
Posted By Bruce Abbott
The ATA-1 specification...

The ATA-1 specification (http://eab.abime.net/attachment.php?attachmentid=29718&d=1320241861) does not say anything about termination, only that...


Here's a typical ISA bus IDE controller card....
Forum: News 01 May 2021, 02:46
Replies: 55
Views: 9,536
Posted By Bruce Abbott
Yes. It routes the internal drive's read data to...

Yes. It routes the internal drive's read data to the external drive's write data pin, and drive select 3 to the external drive's write enable. Then both drives are selected at the same time so data...
Forum: News 29 April 2021, 12:53
Replies: 55
Views: 9,536
Posted By Bruce Abbott
It only gets complex when people try to abuse it...

It only gets complex when people try to abuse it - which lawyers love making money out of.

It's only a 'minefield' if you make it one.

Considering that X-Copy was the favorite tool of immoral...
Forum: Retrogaming General Discussion 27 April 2021, 11:31
Replies: 75
Views: 9,489
Posted By Bruce Abbott
BTW it's not only mediocre ports that might be...

BTW it's not only mediocre ports that might be improved. In 1986 when I transferred the Graphic Adventure Creator (https://en.wikipedia.org/wiki/Graphic_Adventure_Creator) from tape to disk, I...
Forum: Retrogaming General Discussion 27 April 2021, 11:07
Replies: 75
Views: 9,489
Posted By Bruce Abbott
Even more shocking are all those ZX Spectrum...

Even more shocking are all those ZX Spectrum games that were ported to the CPC with the Spectrum's crappy screen mode emulated, complete with color clash!

But some games, such as Jon Ritman's...
Forum: Retrogaming General Discussion 27 April 2021, 10:06
Replies: 75
Views: 9,489
Posted By Bruce Abbott
'Back in the time' I had a CPC664, which was only...

'Back in the time' I had a CPC664, which was only produced for a very short time. The 664 was basically a combination of the 464 with the optional disc drive built in instead of the cassette tape...
Forum: Coders. General 26 April 2021, 09:25
Replies: 107
Views: 10,511
Posted By Bruce Abbott
Not just less impressive looking, but less...

Not just less impressive looking, but less impressive functionally too. For example, one 'impressive' thing I liked about the Amiga was how it broke free of the horrible 8+3 filename length that...
Forum: Coders. General 26 April 2021, 07:50
Replies: 107
Views: 10,511
Posted By Bruce Abbott
No we don't. The original statement I made that...

No we don't. The original statement I made that you objected to was that by the 90's it didn't matter how many PCs IBM sold, because PC clones dominated the market and Apple's share of that market...
Forum: Hardware mods 26 April 2021, 06:24
Replies: 60
Views: 9,338
Posted By Bruce Abbott
I had the same problem with my unit. It chops the...

I had the same problem with my unit. It chops the top and bottom off PAL screens, and the aspect ratio is a bit off. I changed the Workbench resolution to 720x480 and it produced an excellent...
Forum: Amiga scene 24 April 2021, 19:53
Replies: 22
Views: 2,106
Posted By Bruce Abbott
Turns out there is...

Turns out there is (http://m68k.aminet.net/package/misc/emu/amipc-engine) a PC-Engine emulator for the A1200. It only works on some games, and is pretty slow - but it does work.

On my A1200 with...
Forum: Amiga scene 23 April 2021, 10:21
Replies: 22
Views: 2,106
Posted By Bruce Abbott
MSX and Colecovision use the TMS9918 video...

MSX and Colecovision use the TMS9918 video display processor, which is quite different to the NES's graphics system. So I suspect it's not hardware similarities that remind you, but a similar...
Forum: Coders. C/C++ 22 April 2021, 09:41
Replies: 26
Views: 1,614
Posted By Bruce Abbott
No, we didn't forget. You invited negativity by...

No, we didn't forget. You invited negativity by posting this,

and then this,

If only we had known that by 'Amiga 68k, even if it runs at 5 fps' you actually meant a Vampire, and by 'forget the...
Forum: Retrogaming General Discussion 17 April 2021, 23:39
Replies: 66
Views: 4,100
Posted By Bruce Abbott
Yes, it is. Doom was the game that the Amiga was...

Yes, it is. Doom was the game that the Amiga was measured up to in the mid 90's, and failed. But in the late 90's the price of accelerator cards like the Blizzard 1230-IV tumbled, and then the A1200...
Forum: Retrogaming General Discussion 17 April 2021, 09:17
Replies: 66
Views: 4,100
Posted By Bruce Abbott
Yes, obviously. It's acceptable to me. ...

Yes, obviously.

It's acceptable to me.

True.

030 and 020 have same compatibility, but FastRAM outside 16MB address range may be a problem, in which case you just run NoFastMem and play the...
Forum: Amiga scene 17 April 2021, 03:23
Replies: 480
Views: 33,771
Posted By Bruce Abbott
Before 1981? Data is hard to come by, but if you...

Before 1981? Data is hard to come by, but if you include the Z80 then I would guess the markets were comparable. But it's not relevant anyway. Commodore never intended to be a chip vendor, and other...
Forum: Amiga scene 16 April 2021, 05:42
Replies: 480
Views: 33,771
Posted By Bruce Abbott
Same reason as all the others - to make money! ...

Same reason as all the others - to make money!

Olivetti (http://www.computinghistory.org.uk/det/10534/Olivetti-M24/), Ferranti (http://www.computinghistory.org.uk/det/7141/Ferranti-Advance-86/),...
Forum: Coders. C/C++ 15 April 2021, 15:54
Replies: 26
Views: 1,614
Posted By Bruce Abbott
Which games? In what way did they 'fail to run'? ...

Which games? In what way did they 'fail to run'?

You can't run them on a real MSX computer?
Forum: Retrogaming General Discussion 14 April 2021, 10:46
Replies: 194
Views: 10,761
Posted By Bruce Abbott
Define 'accurately'. Paula has 14 bits per...

Define 'accurately'.

Paula has 14 bits per channel, which should be plenty enough. But as you say, this is the smallest problem.

Not that strange, it just sums the 3 DAC current outputs in a...
Forum: Retrogaming General Discussion 12 April 2021, 02:59
Replies: 194
Views: 10,761
Posted By Bruce Abbott
Not really. The YM22149 generates square waves...

Not really. The YM22149 generates square waves with up to 32 levels. Paula can easily reproduce that with enough fidelity that you would not be able to tell that it wasn't a YM, and play several...
Forum: Retrogaming General Discussion 11 April 2021, 08:55
Replies: 194
Views: 10,761
Posted By Bruce Abbott
Joking aside, the YM is less resource-hungry than...

Joking aside, the YM is less resource-hungry than Paula - a particularly important factor for 8 bit computers, but also an advantage on lower powered 16 bit machines too. No sample memory is...
Forum: Amiga scene 10 April 2021, 03:51
Replies: 480
Views: 33,771
Posted By Bruce Abbott
If this was true then chip manufacturers would...

If this was true then chip manufacturers would have gone for the smallest possible size straight away - but they couldn't because their processes were not clean and accurate enough. Only after...
Forum: Amiga scene 09 April 2021, 09:03
Replies: 480
Views: 33,771
Posted By Bruce Abbott
You were thinking of Windows 10 when you wrote...

You were thinking of Windows 10 when you wrote that, right?

Yeah, all those different video and picture formats that people created just to be different (they will tell you it was to make it...
Forum: Coders. Asm / Hardware 07 April 2021, 23:38
Replies: 3
Views: 479
Posted By Bruce Abbott
There is also this online reference... ...

There is also this online reference...

MC680x0 Reference 1.1, ©April,May 1995 by Flint/DARKNESS. (http://oldwww.nvg.ntnu.no/amiga/MC680x0_Sections/index.HTML)

...which may be more convenient...
Forum: Amiga scene 07 April 2021, 02:29
Replies: 480
Views: 33,771
Posted By Bruce Abbott
No, they didn't. And with an IBM computer they...

No, they didn't. And with an IBM computer they didn't have to worry because IBM had their back. Not that using it was easy. You had to pore over manuals and try to remember arcane commands with...
Forum: Amiga scene 06 April 2021, 03:24
Replies: 480
Views: 33,771
Posted By Bruce Abbott
That's right. A PC was always better than an...

That's right. A PC was always better than an Amiga in every way that matters (even a 1981 PC with 64k RAM and no disk drive). So why would anyone want an Amiga?

A computer that is not used for...
Forum: Retrogaming General Discussion 05 April 2021, 03:29
Replies: 194
Views: 10,761
Posted By Bruce Abbott
But two sound chips don't sound twice as good as...

But two sound chips don't sound twice as good as a single chip. What I find impressive is how mach can be done with 3 or channels. I listen to an '8 channel' mod and wonder whether it is actually...
Forum: Amiga scene 03 April 2021, 23:45
Replies: 29
Views: 2,421
Posted By Bruce Abbott
Which is why the easiest way to do a fast chunky...

Which is why the easiest way to do a fast chunky mode would have been to use separate video memory like PCs did. If that means no sprites, blitter, copper etc. in chunky mode then too bad. PCs didn't...
Forum: Amiga scene 03 April 2021, 23:16
Replies: 480
Views: 33,771
Posted By Bruce Abbott
Yep, that REAL arsehole who invented the PC, the...

Yep, that REAL arsehole who invented the PC, the bane of every other computer platform since! If it wasn't for this arsehole the Amiga would have thrived!

Manufacturing silicon chips has never...
Forum: support.Hardware 03 April 2021, 01:28
Replies: 103
Views: 3,316
Posted By Bruce Abbott
I second that suggestion. In 1990 what would you...

I second that suggestion. In 1990 what would you have done - that's right, bought a spiffy new RAM expansion! Today they are much cheaper and more affordable, smaller, lower power and more reliable....
Forum: Amiga scene 03 April 2021, 00:48
Replies: 29
Views: 2,421
Posted By Bruce Abbott
'As soon as they could', would be when VGA...

'As soon as they could', would be when VGA appeared - and only in one resolution (320x200) with no blitter, no sprites, no copper etc. The CPU had to do it all - which made it much easier to program...
Forum: Amiga scene 02 April 2021, 10:37
Replies: 480
Views: 33,771
Posted By Bruce Abbott
If an AGA A3000 had been released in 1991,...

If an AGA A3000 had been released in 1991, existing A3000 owners like me would have been pissed!

But it wasn't going to happen. Schematics for the prototype are dated 15th November 1991, which...
Forum: Amiga scene 02 April 2021, 10:05
Replies: 480
Views: 33,771
Posted By Bruce Abbott
2.5" hard drives were not 'ridiculously'...

2.5" hard drives were not 'ridiculously' expensive. They cost a bit than typical 3.5" and 5.25" drives, but then so did SCSI drives (which Amiga users were used to having to pay extra for).

One...
Forum: Coders. Asm / Hardware 01 April 2021, 21:13
Replies: 74
Views: 4,544
Posted By Bruce Abbott
There are other ways of dealing with that, though...

There are other ways of dealing with that, though an extra table might be the simplest method.

Seems I have misinterpreted what you meant by Trace mode. I was thinking you would be using it to...
Forum: Amiga scene 01 April 2021, 20:19
Replies: 480
Views: 33,771
Posted By Bruce Abbott
Yep, if you just 'place' it over the CPU it can...

Yep, if you just 'place' it over the CPU it can be unreliable (had that problem with the Viper CPU board in my A600). The Vampire came with screws that clamp the board down to the motherboard. The...
Forum: Amiga scene 01 April 2021, 19:33
Replies: 480
Views: 33,771
Posted By Bruce Abbott
Only if the 'fast' RAM is separated from the...

Only if the 'fast' RAM is separated from the ChipRAM bus. This was why the trapdoor memory in an OCS A500 is called 'slow' memory - it's connected to the ChipRAM bus so it is constrained to the same...
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