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Search: Posts Made By: Megol
Forum: Coders. General 15 June 2018, 15:19
Replies: 18
Views: 791
Posted By Megol
I can assure you nobody laughed at the Andropolis...

I can assure you nobody laughed at the Andropolis 3D part.
Forum: Amiga scene 10 June 2018, 17:47
Replies: 625
Views: 25,378
Posted By Megol
Something worth spending my time for. Like maybe...

Something worth spending my time for. Like maybe getting somebody to realize things aren't based on personal ideas but facts.
If one instead get repeatedly insulted in a way that shows the others in...
Forum: Amiga scene 10 June 2018, 17:25
Replies: 625
Views: 25,378
Posted By Megol
Anything up to ARM version 5 should be possible...

Anything up to ARM version 5 should be possible to do, first released in 1998 so ca 20 years ago.
Forum: Retrogaming General Discussion 02 June 2018, 14:45
Replies: 5
Views: 399
Posted By Megol
This is really nice! Didn't even know of that...

This is really nice! Didn't even know of that board, opens up some possibilities for cheap and quick interfaces.

Any idea if it would possible to add Amiga mouse support? The board/firmware would...
Forum: Amiga scene 31 May 2018, 16:07
Replies: 625
Views: 25,378
Posted By Megol
Because it doesn't make any difference. ...

Because it doesn't make any difference.



BIC = bit clear
NE = execute on Not Equal = Z condition code clear
No S = doesn't set flags

R0, R1, R2 ASR R3 ; R0 = R1 op (R2 ASR R3)
Forum: Amiga scene 25 May 2018, 18:44
Replies: 625
Views: 25,378
Posted By Megol
..

..
Forum: Amiga scene 25 May 2018, 17:56
Replies: 625
Views: 25,378
Posted By Megol
..

..
Forum: Amiga scene 23 May 2018, 20:24
Replies: 625
Views: 25,378
Posted By Megol
Smaller: yes. A few percent at most. Not easier...

Smaller: yes. A few percent at most.
Not easier to support in software.
Faster: in a pure speed-demon design, yes. A few percent lower latency in adder path and about one clock lower latency for...
Forum: Amiga scene 22 May 2018, 18:46
Replies: 625
Views: 25,378
Posted By Megol
Do not understand what that would be. ...

Do not understand what that would be.



Yes while doing the work of two instructions together being 24 bytes. Guess what's smaller, easier to support in hardware, faster?

64 bit values are...
Forum: Amiga scene 22 May 2018, 15:05
Replies: 625
Views: 25,378
Posted By Megol
Modern processors are implementations of their...

Modern processors are implementations of their ISA and the idea behind the ISA is what IBM called architecture when releasing the IBM 360: a contract describing how the processor behaves rather than...
Forum: Amiga scene 18 May 2018, 12:20
Replies: 625
Views: 25,378
Posted By Megol
For processing intensive workloads that is close...

For processing intensive workloads that is close to unmeasurable.

And that is by interpreting this nonsense to something that could be remotely relevant in context.
Forum: Amiga scene 15 May 2018, 12:54
Replies: 625
Views: 25,378
Posted By Megol
Pins were expensive at the time with the 68000...

Pins were expensive at the time with the 68000 using the largest package possible. The processor core is actually fully 16 bit with the exception of the registers (conceptually, they were implemented...
Forum: Amiga scene 14 May 2018, 14:17
Replies: 625
Views: 25,378
Posted By Megol
That isn't saying anything. Many RISC designs are...

That isn't saying anything. Many RISC designs are easy to code for but not exactly funny. The original ARM is different, it is in many ways more CISC than RISC.



Tongue in cheek I hope. I wrote...
Forum: Amiga scene 13 May 2018, 20:28
Replies: 625
Views: 25,378
Posted By Megol
And this philosophy is what exactly? ...

And this philosophy is what exactly?



You keep saying this but have you actually programmed for x86 and ARM?

What is wrong with the original ARM instruction set for instance?
Forum: Amiga scene 13 May 2018, 14:29
Replies: 625
Views: 25,378
Posted By Megol
That's not a good idea. One could do that with...

That's not a good idea. One could do that with either hardware or software translation to native instruction set - which is how most designs but the most RISCy RISC ones does it.

The type of...
Forum: Amiga scene 13 May 2018, 12:52
Replies: 625
Views: 25,378
Posted By Megol
So you are a fan of segmentation? Given your...

So you are a fan of segmentation? Given your views on x86 I'd never thought I see this. ;)



Who talks about loading? Think single level store: every data that can be accessed have an address....
Forum: News 12 May 2018, 14:32
Replies: 41
Views: 3,361
Posted By Megol
Be very careful when doing something like that!...

Be very careful when doing something like that! IME it's very easy to worsen the contacts and very hard to get them better.
Forum: Amiga scene 10 May 2018, 20:13
Replies: 625
Views: 25,378
Posted By Megol
Don't act stupid. Meltdown is an Intel ****up...

Don't act stupid.
Meltdown is an Intel ****up but can be protected against with some performance impact.
Spectre is a bigger problem but doesn't lead to computers being broken as you imply.
...
Forum: Amiga scene 10 May 2018, 14:44
Replies: 625
Views: 25,378
Posted By Megol
That's not backwards compatible. If one are to...

That's not backwards compatible. If one are to drop that why not make a modern OS instead?



Of course it can be supported without any memory protection, the problem with dragging Amiga OS into...
Forum: Coders. General 06 May 2018, 13:37
Replies: 6
Views: 615
Posted By Megol
The problem is that the main idea is supporting a...

The problem is that the main idea is supporting a "prefix" instruction before any old instruction translating any 2 op instruction into a 3 op one.

Sure just supporting longs is one option but...
Forum: Coders. General 04 May 2018, 18:25
Replies: 6
Views: 615
Posted By Megol
I agree that confusion isn't good however the...

I agree that confusion isn't good however the problems described are real.



Actually that don't have to be the case. In an unlikely future with a wide OoO 68k with let's say 3 ALU pipes 2 of...
Forum: Coders. General 03 May 2018, 16:53
Replies: 6
Views: 615
Posted By Megol
A question to coders - 3 op instructions [fpga 68k]

I've started thinking on 68k FPGA again, as before it will probably not result in anything. Except wasting of my time of course.

Thinking about a 3 operand extension where instructions can have...
Forum: Amiga scene 02 May 2018, 18:33
Replies: 625
Views: 25,378
Posted By Megol
The main problem is that it wouldn't be a classic...

The main problem is that it wouldn't be a classic Amiga and it wouldn't be a modern machine. IIRC the Hombre chip wouldn't even run an Amiga-type operating system.

The Apollo project is working on...
Forum: Amiga scene 01 May 2018, 19:01
Replies: 625
Views: 25,378
Posted By Megol
If you want a modern system yes. There are...

If you want a modern system yes.

There are no modern 68k chips. The Apollo core is comparable to a 1995 Pentium MMX but clocked much lower. Other effects makes it better in some cases but I'd bet...
Forum: Amiga scene 01 May 2018, 18:44
Replies: 17
Views: 1,119
Posted By Megol
Xerox, Apple Lisa, Apple Macintosh - yes. Unix -...

Xerox, Apple Lisa, Apple Macintosh - yes. Unix - no.

MGR for Unix was released in some form in 1984.
X Windows - 1984.



No.
Forum: Amiga scene 28 April 2018, 16:21
Replies: 625
Views: 25,378
Posted By Megol
When the philosophy hinder development that makes...

When the philosophy hinder development that makes it hard.
Many ideas from the original are there in the modified NextStep system.



This is like comparing CP/M with a modern Linux system. Are...
Forum: News 26 April 2018, 15:35
Replies: 39
Views: 4,143
Posted By Megol
Perhaps this isn't just an Amiga accelerator?

Perhaps this isn't just an Amiga accelerator?
Forum: Amiga scene 26 April 2018, 15:24
Replies: 625
Views: 25,378
Posted By Megol
Many things changed were because of technical...

Many things changed were because of technical reasons. The original Mac OS was extended significantly compared to the original but it still had the same code base. A code base that didn't work...
Forum: Amiga scene 21 April 2018, 15:35
Replies: 625
Views: 25,378
Posted By Megol
Neither would I. But that wasn't what I was...

Neither would I. But that wasn't what I was referring to: directly controlling the GPU by writing registers and memory fields according to the documentation.

This would probably be easiest in...
Forum: Coders. General 20 April 2018, 20:36
Replies: 516
Views: 37,099
Posted By Megol
Well I'd watch it.

Well I'd watch it.
Forum: Amiga scene 20 April 2018, 20:29
Replies: 625
Views: 25,378
Posted By Megol
But is this only positive? Before throwing things...

But is this only positive? Before throwing things at me remember that Amiga OS while advanced for its time have severe limitations even in the NG forms.

Old programs already have to run under...
Forum: Amiga scene 20 April 2018, 20:23
Replies: 625
Views: 25,378
Posted By Megol
Of course you can code for it directly if you...

Of course you can code for it directly if you choose the right GPU. Intel and AMD have released good information in the past at least. But why?

Not that direct programming was considered a central...
Forum: Coders. Asm / Hardware 29 January 2018, 20:45
Replies: 23
Views: 1,762
Posted By Megol
LE is the mirroring of BE (and vice versa of...

LE is the mirroring of BE (and vice versa of course) - in your example 87654321.

But whatever. The real world doesn't care.
Forum: Coders. Asm / Hardware 29 January 2018, 16:39
Replies: 23
Views: 1,762
Posted By Megol
If you accept that the format isn't scrambled...

If you accept that the format isn't scrambled then you don't have to.

The L->R order for writing isn't more valid than the R->L order. Plenty of writing systems combine the two without being...
Forum: Coders. Asm / Hardware 28 January 2018, 15:14
Replies: 23
Views: 1,762
Posted By Megol
As I already said I have no problem reading hex...

As I already said I have no problem reading hex dumps using the LE format.
Really if that is a problem for someone they shouldn't be reading hex dumps at all.

BTW you swapped BE <-> LE in your...
Forum: Coders. Asm / Hardware 28 January 2018, 14:54
Replies: 23
Views: 1,762
Posted By Megol
Most influential computer family: IBM system...

Most influential computer family:
IBM system 360 that lives on as the Z family of computers. 1965 to 2018 and still going strong. Big endian.
Forum: Coders. Asm / Hardware 27 January 2018, 22:28
Replies: 23
Views: 1,762
Posted By Megol
It helps with some math but doesn't really matter...

It helps with some math but doesn't really matter anymore. But the same applies to big endian - just doesn't matter.



byte: LL
word: LL LH
dword (long): LL LH HL HH

Is read in the order:...
Forum: Coders. Asm / Hardware 27 January 2018, 21:55
Replies: 23
Views: 1,762
Posted By Megol
Why would it be superior? Some things are better...

Why would it be superior? Some things are better and some things are worse.

Doesn't matter in practice. Unless one is lazy and don't want to learn simple things.



Signed zero, less value...
Forum: Coders. Asm / Hardware 17 January 2018, 13:15
Replies: 17
Views: 874
Posted By Megol
Thanks for the explanation! While I have used the...

Thanks for the explanation! While I have used the "trick" in the past I've never actually looked at how it works.
Forum: Coders. Asm / Hardware 17 January 2018, 00:01
Replies: 17
Views: 874
Posted By Megol
Well floats are just scaled integers with a funky...

Well floats are just scaled integers with a funky encoding.
But a lookup table should be faster in this case I think?
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