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Forum: Hardware mods Today, 16:57
Replies: 189
Views: 10,220
Posted By hooverphonique
Well, let's hope they are within the typical...

Well, let's hope they are within the typical delay spec then, because otherwise you'll be in trouble :)
Forum: Hardware mods Today, 14:07
Replies: 189
Views: 10,220
Posted By hooverphonique
Do we know anything about the inter-flipflop...

Do we know anything about the inter-flipflop propagation delay variation on this? The 1803 is specified to be within 2ns, but as far as I can see, nothing is spec'd for 175.. I don't know how much of...
Forum: Coders. Asm / Hardware Yesterday, 21:51
Replies: 69
Views: 3,640
Posted By hooverphonique
Very interesting to follow, this thread is :) ...

Very interesting to follow, this thread is :)



yes, those old kickstart versions (1.2, 1.3) do use the blitter for mfm decoding..
Forum: Coders. Asm / Hardware Yesterday, 21:30
Replies: 6
Views: 212
Posted By hooverphonique
With (e.g.) bresenham, you can just keep...

With (e.g.) bresenham, you can just keep iterating, and the ufo will keep the same trajectory even when passing where Jack was.
Forum: Coders. Asm / Hardware 16 February 2018, 12:30
Replies: 69
Views: 3,640
Posted By hooverphonique
Additional drives are detected by the OS by...

Additional drives are detected by the OS by clocking the SEL line 32 times and looking at the pulse train coming out of the RDY line (this is one of the reasons you need extra hw to connect an...
Forum: Amiga scene 13 February 2018, 11:44
Replies: 6
Views: 456
Posted By hooverphonique
Look on the distributors page ;)

Look on the distributors page ;)
Forum: Coders. Asm / Hardware 12 February 2018, 12:08
Replies: 69
Views: 3,640
Posted By hooverphonique
No, it can't..

No, it can't..
Forum: support.Hardware 12 February 2018, 12:03
Replies: 7
Views: 236
Posted By hooverphonique
If you just use SEL2 on the amiga floppy port and...

If you just use SEL2 on the amiga floppy port and connect this to SEL0 of the first external drive, it will become DF2, but I think the amiga will skip looking for DF2 if DF1 isn't present, so you...
Forum: Coders. Asm / Hardware 07 February 2018, 15:52
Replies: 23
Views: 910
Posted By hooverphonique
Yes, that is probably a reasonable compromise..

Yes, that is probably a reasonable compromise..
Forum: Coders. Asm / Hardware 07 February 2018, 14:09
Replies: 23
Views: 910
Posted By hooverphonique
The whole point of using LoadView(NULL) is to...

The whole point of using LoadView(NULL) is to avoid having to explicitly set all sorts of gfx-related registers (which depend on chipset version) to reset the display ;)
Forum: Hardware mods 05 February 2018, 11:36
Replies: 5
Views: 336
Posted By hooverphonique
You could make an adapter board (or even one for...

You could make an adapter board (or even one for each chip if space permits) for the zip chips - they are the same, but in a different package. Otherwise the 424400 may serve as a replacement, which...
Forum: support.Hardware 05 February 2018, 11:29
Replies: 12
Views: 433
Posted By hooverphonique
^This.. And if you're able to make a solution...

^This.. And if you're able to make a solution using a PMIC for Li ion charging, I'm sure you're able to source the 5V from somewhere as well ;) (perhaps a spare molex power connector, if you don't...
Forum: Hardware mods 03 February 2018, 00:29
Replies: 5
Views: 336
Posted By hooverphonique
Looks like these are really har to find.. There's...

Looks like these are really har to find.. There's this (https://www.utsource.net/itm/p/2223520.html), though..

Otherwise making an adapter board with a different kind of 1Mx4 chip might be an...
Forum: Hardware mods 29 January 2018, 12:57
Replies: 2,770
Views: 200,860
Posted By hooverphonique
Stephen, did you notice this ...

Stephen, did you notice this (http://eab.abime.net/showpost.php?p=1215334&postcount=83)parallel port sd card interface project?
Maybe the amiga device driver implementation part of the code is of...
Forum: support.Hardware 29 January 2018, 12:02
Replies: 6
Views: 210
Posted By hooverphonique
Kickstart 3.1 has a longer delay while waiting...

Kickstart 3.1 has a longer delay while waiting for drives to get ready - maybe that's a solution?
Forum: Coders. Asm / Hardware 25 January 2018, 11:47
Replies: 3
Views: 242
Posted By hooverphonique
As Toni said, ABD and ACD gives the same result....

As Toni said, ABD and ACD gives the same result. If you want the blit to take more time (in order to better interleave cpu operations?), use BCD.
Forum: Hardware mods 11 January 2018, 11:17
Replies: 2,770
Views: 200,860
Posted By hooverphonique
Yes, I thought the same when watching a review of...

Yes, I thought the same when watching a review of the Witcher card, which has a couple of wires with IC test clips on the end that go to the CIA and GARY (IIRC). Looked nice and easy.

Don't get me...
Forum: Hardware mods 09 January 2018, 22:56
Replies: 2,770
Views: 200,860
Posted By hooverphonique
In the thread linked to by Toni, Ross hints at...

In the thread linked to by Toni, Ross hints at VPA using the E-clock domain, which would make autovectoring slow, so what the amiga designers did was probably this little hack of using the end of ROM...
Forum: Hardware mods 09 January 2018, 21:58
Replies: 2,770
Views: 200,860
Posted By hooverphonique
And this is most probably the reason most asm...

And this is most probably the reason most asm coders think it is using auto-vectoring (myself included back then), but in fact the amiga designers just reused the autovector indices (which the 68000...
Forum: Hardware mods 09 January 2018, 12:21
Replies: 2,770
Views: 200,860
Posted By hooverphonique
As far as I've understood it, technically the...

As far as I've understood it, technically the Amiga doesn't use auto-vectors (i.e. assertion of VPA), but does something that looks like auto-vectoring (using IPL to look up the vector number).
...
Forum: Retrogaming General Discussion 04 January 2018, 16:04
Replies: 184
Views: 13,912
Posted By hooverphonique
Each vertical line of a wall would need to be a...

Each vertical line of a wall would need to be a single color (i.e. a wall could have varying color left-to-right, but not top-to-bottom). What you're suggesting there is pretty much the same as...
Forum: Retrogaming General Discussion 21 December 2017, 11:30
Replies: 184
Views: 13,912
Posted By hooverphonique
Practically not really, I'd say...

Practically not really, I'd say...
Forum: Retrogaming General Discussion 20 December 2017, 12:00
Replies: 184
Views: 13,912
Posted By hooverphonique
Doing vertical blitter fill (2 xor'd sources, one...

Doing vertical blitter fill (2 xor'd sources, one destination) on a 320x256 3 bpl screen (and no other dma) takes more than 20ms, and slows the cpu a lot, so either low framerate or a small screen...
Forum: Retrogaming General Discussion 18 December 2017, 13:59
Replies: 184
Views: 13,912
Posted By hooverphonique
The point here is that the Genesis has 2 chunky...

The point here is that the Genesis has 2 chunky pixels per byte, which is what really makes the difference compared to the amiga - all the other speed-ups mentioned are trivial.
Forum: Coders. General 11 December 2017, 14:24
Replies: 40
Views: 3,832
Posted By hooverphonique
I know ;)

I know ;)
Forum: support.Demos 11 December 2017, 13:55
Replies: 7
Views: 552
Posted By hooverphonique
There are demos that require ppc and rtg, maybe...

There are demos that require ppc and rtg, maybe that's what you're after? iirc, many of them were made by a group called Potion..
Forum: Coders. General 08 December 2017, 11:24
Replies: 40
Views: 3,832
Posted By hooverphonique
The copper can load a palette register every 8...

The copper can load a palette register every 8 lo-res pixels. When you see "copper chunky" with a higher res, it's because multiple palette registers have been pre-loaded for that horizontal section...
Forum: Coders. Asm / Hardware 04 December 2017, 15:32
Replies: 22
Views: 1,428
Posted By hooverphonique
I saw something yesterday which suggests that the...

I saw something yesterday which suggests that the cd32 cias are implemented in the akiko chip, so they could have different functionality than orignal 8520's..
Forum: support.Hardware 20 November 2017, 11:45
Replies: 15
Views: 873
Posted By hooverphonique
Repository starred :) If you want some sort...

Repository starred :)

If you want some sort of connector on the main pcb, you could create a pci-card edge connector which doesn't cost anything (except for pcb routing effort).
Forum: support.WinUAE 18 November 2017, 00:03
Replies: 4
Views: 588
Posted By hooverphonique
Of course it wasn't data dependent, but rather...

Of course it wasn't data dependent, but rather the length/alignment of the code that made a difference, and that made a difference because my winuae cpu config was messed up (set to 68040) I think.
Forum: support.WinUAE 17 November 2017, 18:16
Replies: 4
Views: 588
Posted By hooverphonique
Only ISR enabled is VBI, and the blit is...

Only ISR enabled is VBI, and the blit is performed in there (as the only thing) with a blitwait after starting the blitter, then a move to $dff180. The background color change is rock-solid (i.e. not...
Forum: support.WinUAE 13 November 2017, 23:39
Replies: 4
Views: 588
Posted By hooverphonique
Data dependent OCS cycle-exact blitter speed?

I am blitting 27kB from one buffer to another in one go, using D=A xor C (A points to source, C/D to target). the source buffer is static at runtime, but depending on its contents, the blit duration...
Forum: Hardware mods 10 November 2017, 14:56
Replies: 337
Views: 43,503
Posted By hooverphonique
What's the deal with sysinfo there, saying it's...

What's the deal with sysinfo there, saying it's 1.0MB, when it's 1.5MB? :spin
Forum: support.Hardware 06 November 2017, 11:07
Replies: 15
Views: 669
Posted By hooverphonique
Right... My remark was relating to restart, not...

Right... My remark was relating to restart, not power cycling specifically - sorry!
Forum: support.Hardware 05 November 2017, 14:34
Replies: 15
Views: 669
Posted By hooverphonique
note that this only works if the drives are both...

note that this only works if the drives are both DD or HD.
Forum: Looking for a game name ? 26 October 2017, 16:57
Replies: 24
Views: 2,414
Posted By hooverphonique
Into the eagle's nest? http://hol.abime.net/2659

Into the eagle's nest? http://hol.abime.net/2659
Forum: Hardware mods 26 October 2017, 11:24
Replies: 37
Views: 2,592
Posted By hooverphonique
Hehehe.. I like it :laughing

Hehehe.. I like it :laughing
Forum: Hardware mods 25 October 2017, 13:51
Replies: 37
Views: 2,592
Posted By hooverphonique
I'm not sure how to interpret 'I also predicted...

I'm not sure how to interpret 'I also predicted your comment coming from Fyn', but a nice down-to-earth place with good food and a nice cocktail bar is Madklubben Vesterbro - but what suits you best...
Forum: Coders. Asm / Hardware 25 October 2017, 11:57
Replies: 63
Views: 4,430
Posted By hooverphonique
Yes. Although unlikely, the screen switch could...

Yes. Although unlikely, the screen switch could also be performed by the user at the critical point, so finding a fix/workaround is probably a good idea..
Forum: Hardware mods 25 October 2017, 11:52
Replies: 37
Views: 2,592
Posted By hooverphonique
Looks like a nice project where you more or less...

Looks like a nice project where you more or less thought of everything :great
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