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Forum: Coders. General Yesterday, 12:45
Replies: 305
Views: 19,664
Posted By meynaf
Ok then. Let's go for it. I suppose...

Ok then. Let's go for it.



I suppose the effect for the reads is the one mentioned by grond. It doesn't explain everything but it exists.
For the writes, we know why already.

Now perhaps...
Forum: Coders. General 11 June 2021, 13:46
Replies: 305
Views: 19,664
Posted By meynaf
Advantages of 040 and 060 is that they are able...

Advantages of 040 and 060 is that they are able to continue even if there are other memory accesses, and the push buffer (at least on 060) can contain several items.
You can however make things...
Forum: Coders. General 11 June 2021, 12:28
Replies: 305
Views: 19,664
Posted By meynaf
You said the 68030 is not able to continue...

You said the 68030 is not able to continue execution while a write is pending and that it's just timing sync. From my experience -- not the case.
The proof is that if you attempt to access memory...
Forum: Coders. General 11 June 2021, 08:52
Replies: 305
Views: 19,664
Posted By meynaf
If this is true, then a fastmem access should be...

If this is true, then a fastmem access should be doable for free too, not only register access. But it's not. Any memory access, even near the end of the loop, completely blocks until the write is...
Forum: Coders. General 08 June 2021, 13:05
Replies: 305
Views: 19,664
Posted By meynaf
For same reason the 68030 is supposed to do it ? ...

For same reason the 68030 is supposed to do it ?
Or perhaps they just don't have the relevant pins to detect the case ?



Now that's clear. Thank you.
Forum: Coders. General 08 June 2021, 12:39
Replies: 305
Views: 19,664
Posted By meynaf
Looks more like implementation issue - or simply...

Looks more like implementation issue - or simply something missed in the docs - than design issue.
The problem is that the bus cycle could be initiated long after next instruction is executed. In a...
Forum: Coders. General 08 June 2021, 11:54
Replies: 305
Views: 19,664
Posted By meynaf
Design bug, not really. That pin can not be...

Design bug, not really. That pin can not be changed by the underlying hardware before it has decoded the target address, and by that time the 68030 is probably already executing other instructions so...
Forum: Coders. Asm / Hardware 05 June 2021, 18:42
Replies: 202
Views: 172,625
Posted By meynaf
Perhaps it should, yes. Alas this movem...

Perhaps it should, yes. Alas this movem addressing mode isn't allowed.
Forum: Coders. General 05 June 2021, 13:14
Replies: 35
Views: 1,063
Posted By meynaf
Not really. Ancient versions ARE no-op, actually....

Not really. Ancient versions ARE no-op, actually.
But newer ones aren't useful for all 030 owners due targeting EC030 or specific boards. All of what they're supposed to fix has of course little, if...
Forum: Amiga scene 05 June 2021, 12:47
Replies: 52
Views: 22,274
Posted By meynaf
Good luck then. There appears to be code...

Good luck then. There appears to be code scattered in the data files...
Forum: Coders. General 05 June 2021, 12:13
Replies: 35
Views: 1,063
Posted By meynaf
Atari ST has a cartridge connector and it hasn't...

Atari ST has a cartridge connector and it hasn't been used that much...
Forum: Coders. General 05 June 2021, 11:59
Replies: 35
Views: 1,063
Posted By meynaf
Odd, i've always thought 68030.library was no-op....

Odd, i've always thought 68030.library was no-op.
I wonder what it might fix.
Anyway, this won't fix dma wait issues. If you want to see that on your 68060, get some software that can play maxtrax...
Forum: Coders. General 05 June 2021, 11:53
Replies: 35
Views: 1,063
Posted By meynaf
Classical DMA wait issues, nothing mysterious. ...

Classical DMA wait issues, nothing mysterious.
Some games such as Kyrandia or Darkseed randomly miss notes because of this. It may be rare (depends on the music), but it happens.
Forum: Amiga scene 05 June 2021, 07:41
Replies: 52
Views: 22,274
Posted By meynaf
I've had a quick look some years ago. Sundog is...

I've had a quick look some years ago.
Sundog is a different beast, not coded in the same way at all.
So feasible... perhaps, but so much work...
Forum: Coders. General 04 June 2021, 16:17
Replies: 35
Views: 1,063
Posted By meynaf
Have you checked exactly ? To be sure a full...

Have you checked exactly ? To be sure a full disassembly is necessary and i've found nothing about that "DMusic2" software you mention.
I'm ready to bet that it does not play thru audio.device but...
Forum: Coders. General 04 June 2021, 13:13
Replies: 35
Views: 1,063
Posted By meynaf
Aside of channel allocation so direct hardware...

Aside of channel allocation so direct hardware access under OS becomes possible, yes audio.device is worthless.
As it does not properly work around these idiocracies you mention -- as a result all...
Forum: request.Music 03 June 2021, 21:04
Replies: 27
Views: 1,979
Posted By meynaf
Ambermoon can also give access to all musics but...

Ambermoon can also give access to all musics but not right from the start. You can do it by using elf-harp.
Forum: Coders. Asm / Hardware 31 May 2021, 12:11
Replies: 24
Views: 1,064
Posted By meynaf
If the code does not fit into the cache, it has...

If the code does not fit into the cache, it has better be short. The branch solution looks like it is the shortest.
Forum: Amiga scene 27 May 2021, 07:37
Replies: 231
Views: 25,618
Posted By meynaf
No, it was long ago and i didn't pay much...

No, it was long ago and i didn't pay much attention to this. Probably not very good anyway :D
Forum: Amiga scene 26 May 2021, 07:04
Replies: 231
Views: 25,618
Posted By meynaf
Sorry to deceive you, but read the post above...

Sorry to deceive you, but read the post above yours. :p
Forum: Amiga scene 25 May 2021, 19:11
Replies: 231
Views: 25,618
Posted By meynaf
From going into my games list, could come up with...

From going into my games list, could come up with :
Ambermoon
Civilization
Colonization
Dune
Dungeon Master 1 & 2
Chaos Strikes Back
Evil's doom
Eye of the beholder 1 & 2
Flashback
Forum: Coders. General 24 May 2021, 08:07
Replies: 305
Views: 19,664
Posted By meynaf
No it's not right. Many assemblers will emit a...

No it's not right. Many assemblers will emit a warning if you do so.
F.e. phxass will assemble btst #14,(a0) to 0810 000E - but will emit a warning "Bit manipulation out of range".
So yes, at...
Forum: Coders. General 22 May 2021, 19:44
Replies: 305
Views: 19,664
Posted By meynaf
Perhaps you need to know that btst in memory is a...

Perhaps you need to know that btst in memory is a byte operation so bit number ranges from 0 to 7, hence btst #14,(a0) is incorrect.
Forum: request.Music 22 May 2021, 07:41
Replies: 27
Views: 1,979
Posted By meynaf
IIRC SA 1.x and SA 2.x interpret some effect...

IIRC SA 1.x and SA 2.x interpret some effect differently.
Forum: Coders. General 21 May 2021, 10:40
Replies: 305
Views: 19,664
Posted By meynaf
That same manual says swap is word size. But...

That same manual says swap is word size.
But swap affects full 32-bits of the register.
Forum: Coders. General 21 May 2021, 07:55
Replies: 305
Views: 19,664
Posted By meynaf
But look at Table 3-2. Data Movement Operation...

But look at Table 3-2. Data Movement Operation Format.
It says 8->32.



My point is that correct syntax of moveq does not take a size. Same as abcd,tas...
Badly worded with "moveq has no...
Forum: Coders. General 20 May 2021, 20:12
Replies: 305
Views: 19,664
Posted By meynaf
Technically, moveq is 8->32, not 32. You don't...

Technically, moveq is 8->32, not 32. You don't believe me ? Read this then :
http://www2.ece.ohio-state.edu/~degroat/ECE5465/Reference%20mtl/M68000PRM.pdf



Not exactly, no. They just say - and...
Forum: Coders. General 20 May 2021, 19:39
Replies: 305
Views: 19,664
Posted By meynaf
It is not wrong notions. It is 30+ years of...

It is not wrong notions. It is 30+ years of coding.
That some "official" online doc says something does not change what is correct and what is not (btw. Freescale isn't Motorola as we knew it).

...
Forum: Coders. General 20 May 2021, 16:57
Replies: 113
Views: 4,625
Posted By meynaf
Assuredly :) That's keyboard membrane...

Assuredly :)



That's keyboard membrane scan done in 100hz interrupt. Do simple SEI in your code, and gain 20% speed :spin



That's not me saying it's 20%, i'd have bet on much lower...
Forum: Coders. General 20 May 2021, 16:44
Replies: 113
Views: 4,625
Posted By meynaf
That depends how hard you try. And rare are the...

That depends how hard you try. And rare are the programs which need 100% all the time.
Forum: Coders. General 20 May 2021, 16:19
Replies: 113
Views: 4,625
Posted By meynaf
I didn't say it was. I am just expressing an...

I didn't say it was. I am just expressing an opinion, i'm not asking them to change ;)



There are ways to gain some % back, f.e. by raising the task priority, calling CloseWorkbench(), or even...
Forum: Coders. General 20 May 2021, 15:53
Replies: 113
Views: 4,625
Posted By meynaf
You'll have to be a little more precise......

You'll have to be a little more precise... Perhaps you've just run some 68020+ program on 68000 (ok, i should check and bail out, i'm too lazy...).



I still prefer the idea to have specific...
Forum: Coders. General 20 May 2021, 14:02
Replies: 113
Views: 4,625
Posted By meynaf
I've never had any real compatibility issues....

I've never had any real compatibility issues. Only "compatiblity" reports i had were a 040 machine that was rarely used and had random hardware failures, and a cd drive where my picture viewer failed...
Forum: Coders. General 20 May 2021, 09:40
Replies: 305
Views: 19,664
Posted By meynaf
It is in the domain of tolerances. VASM's...

It is in the domain of tolerances. VASM's compatibility with other assemblers - even old and/or buggy ones - is quite high.
As an example, most assemblers will accept moveq.l even though it is...
Forum: Amiga scene 20 May 2021, 08:52
Replies: 21
Views: 1,697
Posted By meynaf
I am really sad that shit happened. I consider...

I am really sad that shit happened. I consider Damien as a friend. Hopefully it is not permanent ban.
Not knowing the facts, I cannot judge.
At least, this sends the message that nobody is above...
Forum: Coders. General 20 May 2021, 08:25
Replies: 113
Views: 4,625
Posted By meynaf
Let's just say we can't agree. It's not the end...

Let's just say we can't agree. It's not the end of the world.



You're talking about the latter, I'm talking about the former (even if i probably didn't explicit it, or even if i indirectly...
Forum: Coders. General 19 May 2021, 19:07
Replies: 113
Views: 4,625
Posted By meynaf
It is neither. Just knowledge about cpu...

It is neither. Just knowledge about cpu incompatibilities - and it's not much as normal code isn't affected.



The reasons why something can break on 68040 but not on 68030 are known so i can...
Forum: Coders. General 19 May 2021, 17:12
Replies: 113
Views: 4,625
Posted By meynaf
I don't need a 68040 to know my code will work on...

I don't need a 68040 to know my code will work on it.
Forum: Coders. General 19 May 2021, 16:51
Replies: 113
Views: 4,625
Posted By meynaf
That's nitpicking. This is cherry...

That's nitpicking.



This is cherry picking.



And the others are ?
Forum: Coders. General 19 May 2021, 15:32
Replies: 113
Views: 4,625
Posted By meynaf
You wrote : "such an environment is far less...

You wrote : "such an environment is far less fragile than the OS itself".
This strongly suggests you're talking about crashing. Bugs that can't crash don't stress the OS.



What you don't see...
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