English Amiga Board


Go Back   English Amiga Board > Search Forums

Showing results 1 to 40 of 609
Search took 0.07 seconds.
Search: Posts Made By: Bruce Abbott
Forum: Coders. C/C++ Today, 09:41
Replies: 26
Views: 1,288
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: 58
Views: 2,870
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: 58
Views: 2,870
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: 31,483
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: 31,483
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: 1,288
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: 9,610
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: 9,610
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: 9,610
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: 31,483
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: 31,483
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: 414
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: 31,483
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: 31,483
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: 9,610
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: 2,262
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: 31,483
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: 102
Views: 2,343
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: 2,262
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: 31,483
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: 31,483
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: 73
Views: 3,693
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: 31,483
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: 31,483
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...
Forum: Retrogaming General Discussion 01 April 2021, 08:53
Replies: 194
Views: 9,610
Posted By Bruce Abbott
Yeah, but that's to be expected on any platform -...

Yeah, but that's to be expected on any platform - because 90% of everything is crap.
(https://en.wikipedia.org/wiki/Sturgeon%27s_law)
Forum: Coders. General 01 April 2021, 00:32
Replies: 91
Views: 8,393
Posted By Bruce Abbott
Proof? I already supplied proof that IBM was...

Proof? I already supplied proof that IBM was doing much better than Apple at the time in question, despite the PC Jr.
PS/2 and PS/1 didn't come until later.

IBM did screw up with the PS/2 for...
Forum: Amiga scene 01 April 2021, 00:07
Replies: 480
Views: 31,483
Posted By Bruce Abbott
That's a good point. It is obvious that Commodore...

That's a good point. It is obvious that Commodore intended the PCMCIA port to be used for FastRAM expansion. Unfortunately at that time laptop PCs tended to use proprietary RAM extensions (sometimes...
Forum: Coders. Asm / Hardware 31 March 2021, 22:55
Replies: 73
Views: 3,693
Posted By Bruce Abbott
Not sure what you mean by that. To trace each...

Not sure what you mean by that. To trace each instruction as it is being executed you absolutely do need 'something special' to break out of the interpreter at the beginning or end of each...
Forum: Coders. Asm / Hardware 31 March 2021, 16:55
Replies: 73
Views: 3,693
Posted By Bruce Abbott
Yes, that is what I meant. Perhaps an analogy...

Yes, that is what I meant. Perhaps an analogy might help get my point across - say I have a car that normally cruises at 100kph, but I put a gearbox in that slows it down to 10kph. If I had a way to...
Forum: Amiga scene 31 March 2021, 00:34
Replies: 480
Views: 31,483
Posted By Bruce Abbott
They wouldn't have been the first - or last - to...

They wouldn't have been the first - or last - to do that. Problem with that theory is they used a 25 pin D connector for both parallel and serial ports, so instead of frying your machine being...
Forum: Coders. Asm / Hardware 30 March 2021, 21:42
Replies: 73
Views: 3,693
Posted By Bruce Abbott
Considering that everything is already being...

Considering that everything is already being slowed down by 1000% I wouldn't be concerned about an extra 10% - especially if it meant making things a lot less complicated - but that's just me.

I...
Forum: Amiga scene 30 March 2021, 05:01
Replies: 480
Views: 31,483
Posted By Bruce Abbott
So what did David Pleasance manage to do on the...

So what did David Pleasance manage to do on the UK market? Did he manage to establish the Amiga as a viable alternative to a PC for productivity apps? Or was he just a salesmen pushing boxes? Did...
Forum: Coders. Asm / Hardware 30 March 2021, 01:55
Replies: 73
Views: 3,693
Posted By Bruce Abbott
That may not be suitable because it modifies the...

That may not be suitable because it modifies the upper 16 bits of D7, but you can do this instead:-

ext.w d7
add.w d7,a6


'NOP' - 29% faster without break
'RTS' - 22% faster without break...
Forum: Retrogaming General Discussion 28 March 2021, 16:29
Replies: 194
Views: 9,610
Posted By Bruce Abbott
Agreed. The first computer I had with an AY was...

Agreed. The first computer I had with an AY was the Amstrad CPC664, which did have stereo output on the headphone socket. It sounded much better when connected to a good stereo system than using the...
Forum: Coders. Asm / Hardware 27 March 2021, 21:18
Replies: 73
Views: 3,693
Posted By Bruce Abbott
I did some testing on my A1200 with Blizzard...

I did some testing on my A1200 with Blizzard 1230-IV 50MHz 030 to see what execution speed can be expected. First I timed 50 million nops (a block of 1000 nops repeated 50,000 times) which took 3...
Forum: Amiga scene 27 March 2021, 03:41
Replies: 480
Views: 31,483
Posted By Bruce Abbott
Very few games that were worth running on the...

Very few games that were worth running on the A600 required the numeric keypad, but many older games wouldn't work properly on a machine with a faster CPU or FastRAM (there were also a lot that...
Forum: Retrogaming General Discussion 27 March 2021, 02:31
Replies: 194
Views: 9,610
Posted By Bruce Abbott
That would describe the SN76489...

That would describe the SN76489 (https://en.wikipedia.org/wiki/Texas_Instruments_SN76489), but the AY has more - its volume controls can be set to ramp automatically to produce sawtooth or triangle...
Forum: Retrogaming General Discussion 27 March 2021, 01:41
Replies: 194
Views: 9,610
Posted By Bruce Abbott
And it doesn't have an AY either unless you add...

And it doesn't have an AY either unless you add the Speech/Sound cartridge (http://www.cocopedia.com/wiki/index.php/Speech/Sound_Cartridge_(26-3144A)). Standard CoCo sound is produced by a 6 bit DAC,...
Forum: Coders. Asm / Hardware 26 March 2021, 11:19
Replies: 73
Views: 3,693
Posted By Bruce Abbott
Oh sorry, when you said "Release the code ?...

Oh sorry, when you said "Release the code ? Maybe, but it's too big to be suitable for a contest" I didn't realize you meant you wanted to keep it private.

Not sure what you mean by this. But...
Forum: Amiga scene 26 March 2021, 10:47
Replies: 480
Views: 31,483
Posted By Bruce Abbott
The biggest problem with PCMCIA was that the...

The biggest problem with PCMCIA was that the standard wasn't finished 'at the time' and it was mostly only used in PC laptops that treated it like an ISA bus so properly implemented 'generic' cards...
Showing results 1 to 40 of 609

 
Forum Jump

All times are GMT +2. The time now is 16:01.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Page generated in 0.12465 seconds with 10 queries