Amiga questions you've always been too embarrassed to ask - Page 57

daxb · 26 November 2016, 13:46

The board design is responsible. Some PPC cards are know for slow chip ram access. Apollo 1240 has/had fastest chip ram access. The new ACA cards may have the fastest chip ram access today?

rare_j · 26 November 2016, 21:33

Thanks for the explaination. I want to check Blizzard 1230 IV chipram access speed compared to bare A1200. Does sysinfo do this?

zipper · 26 November 2016, 22:48

SysSpeed.

daxb · 27 November 2016, 01:22

Bustest might be worth a try.

AlgoRythmic · 29 November 2016, 21:23

Just to be sure, is the Vampire 500 v2 board compatible with a A500+(Plus) model?
Sorry if this has been asked before. Ive searched but couldn't find a definitive answer to this.

emufan · 29 November 2016, 21:47

Quote:

Originally Posted by AlgoRythmic

Just to be sure, is the Vampire 500 v2 board compatible with a A500+(Plus) model?
Sorry if this has been asked before. Ive searched but couldn't find a definitive answer to this.

someone on apollo-core forum wrote this on 16 Nov 2016:

Quote:

V500 will work in A500, A500+, A1000 and A2000 as far as I know.

but you should join the irc channel of the apollo team, link on top of the forum website,
and ask majsta, brian or gunnar

appiah4 · 30 November 2016, 15:15

Who owns the rights to the 680000 CPU and would it be possible to manufacture one with today's fab technology's (14nm etc.) at 1GHz? What would theoretically happen if you would plug in such a chip onto an A500 mainboard?

demolition · 30 November 2016, 15:41

Doing a standard 68000 in a modern 14nm etc process won't make it able to run at modern clock speeds. Apart from being limited by power which will help by going to a modern process, the maximum clock speed is also limited by the propagation delay in the digital gates inside the chip. What matters is the maximum delay from one input to an output. Newer processes will have faster propagation delays due to the gates and capacitances being smaller but not nearly that much.

My guess is that perhaps 68k could be taken to 100MHz before reaching the wall. To achieve higher clocks, you need to pipeline (parallelize) stuff which is what the Vampire team is doing. Doing stuff in parallel will make the maximum signal path shorter, thus enabling higher clocks.

appiah4 · 30 November 2016, 15:52

Even 100MHz is crazy fast compared to say 7MHz in an A500; that would be equivalent to a high and 486 part I'd guess, in terms of raw power?

demolition · 30 November 2016, 16:39

The latest 'real' 68000 can be clocked @50 MHz (overclocked but runs stable), it is available right now and it is not particularly expensive.

Here is a test with Zeus 68k running a 50 MHz 68000:
http://apollo-core.com/knowledge.php...e=352&z=R4yAzw

Gordon · 30 November 2016, 21:44

What's a genlock?

eXeler0 · 30 November 2016, 23:01

Quote:

Originally Posted by Gordon

What's a genlock?

If you remember the old days of analogue video signals and crt tvs you might appreciate that it was a practial issue how to sync video signals from say your Amiga with a different video source. A genlock made sure the signals were synchronized (or "locked" as in "generator locked") when you combined signals from different sources.

Skickat från min LG-H850 via Tapatalk

idrougge · 30 November 2016, 23:17

A genlock superimposes the Amiga graphics on top of another video signal, such as for subtitling, channel logos or infographics.

TroyWilkins · 01 December 2016, 00:40

Quote:

Originally Posted by Gordon

What's a genlock?

I found this video, which demonstrates one being used, which may help?

[ Show youtube player ]

Retro1234 · 01 December 2016, 08:27

Have Two amigas connected via genlock and add that parallax scrolling in youre favourite game youve always wanted

Gordon · 01 December 2016, 11:04

Thank you for the answers everyone, i now know what it is.

emufan · 01 December 2016, 21:08

Quote:

Originally Posted by Gordon

Thank you for the answers everyone, i now know what it is.

you can genlock'ing with winuae - using a capture device connected to your windows box. or just using a video file.

Winuae config (f12) -> Chipset -> Genlock connected -> Capture device (or Video File)

TroyWilkins · 02 December 2016, 00:35

Quote:

Originally Posted by emufan

you can genlock'ing with winuae - using a capture device connected to your windows box. or just using a video file.

Winuae config (f12) -> Chipset -> Genlock connected -> Capture device (or Video File)

I did not know about that one, cool, thank you, that's pretty neat!

emufan · 02 December 2016, 00:54

Quote:

Originally Posted by TroyWilkins

I did not know about that one, cool, thank you, that's pretty neat!

that looks like "build in noise" - choose "video file" and select a movie in the box below (avi, mp4).

TroyWilkins · 02 December 2016, 02:23

Quote:

Originally Posted by emufan

that looks like "build in noise" - choose "video file" and select a movie in the box below (avi, mp4).

I don't have that option, besides, the noise option makes it nice and obvious where the genlock input would be showing.

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26 November 2016, 13:46	#1121
daxb Registered User Join Date: Oct 2009 Location: Germany Posts: 3,307	The board design is responsible. Some PPC cards are know for slow chip ram access. Apollo 1240 has/had fastest chip ram access. The new ACA cards may have the fastest chip ram access today?

26 November 2016, 21:33	#1122
rare_j Zone Friend Join Date: Apr 2005 Location: London Posts: 1,178	Thanks for the explaination. I want to check Blizzard 1230 IV chipram access speed compared to bare A1200. Does sysinfo do this?

26 November 2016, 22:48	#1123
zipper Registered User Join Date: Mar 2004 Location: finland Posts: 1,843	SysSpeed.

27 November 2016, 01:22	#1124
daxb Registered User Join Date: Oct 2009 Location: Germany Posts: 3,307	Bustest might be worth a try.

29 November 2016, 21:23	#1125
AlgoRythmic Registered User Join Date: Jun 2016 Location: MiggyLand Age: 44 Posts: 13	Just to be sure, is the Vampire 500 v2 board compatible with a A500+(Plus) model? Sorry if this has been asked before. Ive searched but couldn't find a definitive answer to this.

30 November 2016, 15:15	#1127
appiah4 Registered User Join Date: May 2015 Location: Somewhere in Time Posts: 492	Who owns the rights to the 680000 CPU and would it be possible to manufacture one with today's fab technology's (14nm etc.) at 1GHz? What would theoretically happen if you would plug in such a chip onto an A500 mainboard?

30 November 2016, 15:41	#1128
demolition Unregistered User Join Date: Sep 2012 Location: Copenhagen / DK Age: 44 Posts: 4,190	Doing a standard 68000 in a modern 14nm etc process won't make it able to run at modern clock speeds. Apart from being limited by power which will help by going to a modern process, the maximum clock speed is also limited by the propagation delay in the digital gates inside the chip. What matters is the maximum delay from one input to an output. Newer processes will have faster propagation delays due to the gates and capacitances being smaller but not nearly that much. My guess is that perhaps 68k could be taken to 100MHz before reaching the wall. To achieve higher clocks, you need to pipeline (parallelize) stuff which is what the Vampire team is doing. Doing stuff in parallel will make the maximum signal path shorter, thus enabling higher clocks.

30 November 2016, 15:52	#1129
appiah4 Registered User Join Date: May 2015 Location: Somewhere in Time Posts: 492	Even 100MHz is crazy fast compared to say 7MHz in an A500; that would be equivalent to a high and 486 part I'd guess, in terms of raw power?

30 November 2016, 16:39	#1130
demolition Unregistered User Join Date: Sep 2012 Location: Copenhagen / DK Age: 44 Posts: 4,190	The latest 'real' 68000 can be clocked @50 MHz (overclocked but runs stable), it is available right now and it is not particularly expensive. Here is a test with Zeus 68k running a 50 MHz 68000: http://apollo-core.com/knowledge.php...e=352&z=R4yAzw

30 November 2016, 21:44	#1131
Gordon Settler Join Date: Feb 2007 Location: Serf City Posts: 1,760	What's a genlock?

30 November 2016, 23:17	#1133
idrougge Registered User Join Date: Sep 2007 Location: Stockholm Posts: 4,356	A genlock superimposes the Amiga graphics on top of another video signal, such as for subtitling, channel logos or infographics.

01 December 2016, 08:27	#1135
Retro1234 Phone Homer Join Date: Jun 2006 Location: 5150 Posts: 5,812	Have Two amigas connected via genlock and add that parallax scrolling in youre favourite game youve always wanted

01 December 2016, 11:04	#1136
Gordon Settler Join Date: Feb 2007 Location: Serf City Posts: 1,760	Thank you for the answers everyone, i now know what it is.

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