Int_2 mod done!

[Acill]

Well I just did the Int_2 mod on my A3000 and am using the cyberscsi port on my CSPPC now. I cant believe the speed increase over the stock A3000 SCSI! I've felt like I have been cheated all these years! Well it was easy and fun to do. I sure am glad I did it!

[Roj]

What kinda speed do you get now? What drive(s) do you have in your system?

If yours is faster than mine I'm gonna be :-(

:-D

[Acill]

Hey Roj! I dont know about actual data transfer rate since I havent got a program to test it. I can just tell from moving from drawer to drawer, using Ibrowse and other stuff that writes to the disk a lot. My bootup time is fast too now.

How is the CVPPC working for you? Great card isnt it? It supports Warp3D if you didnt know!

[Crusher]

I´ve heard a number of 40MB/s(with a real UWscsi disk). Don´t know if it´s true but it sure feels like it.  :-D

[Roj]

How is the CVPPC working for you? Great card isnt it? It supports Warp3D if you didnt know!

The CVPPC is working out great. Warp3D was the first thing I installed, followed by StormMesa and all its gazillion demos. I've also worked around the lack of onboard scandoubler/flickerfixer by hooking up my old A520 and running the output from there through my All-in-Wonder card on my PC, so AGA screens show up in a window on.. er.. Windows. :inquisitive:

For speed tests, try ScsiBench and/or SysSpeed. I'm curious to see what speed results you get.

[patrik]

@Crusher:

I tried a one year old 10krpm 72GB IBM U160 disk on my CSPPC and got 34MB/Sec when doing raw reads from the disk. Ofcourse the CSPPC SCSI-interface was set to use the synchronous 20MHz 16-bit transfer mode... this mode is the fastest available mode and thus 40MB/Sec is the theoretical maximum for the CSPPC SCSI.

Just as a sidenote, even if the CSPPC SCSI-chip could handle faster SCSI transfer modes, like 80MB/Sec, it probably would not be able to transfer data to/from memory any faster. If you own a CSPPC, download bustest and execute it with the argument 'fast'. The results you will get from bustest is the bandwidth at which the 68k cpu can access the CSPPC onboard fastmem. You can assume that the CSPPC SCSI-chip wont be able to do any better multiple longword transfers than the 68k cpu. If you consider that, you will see that there is not much bandwidth headroom when using 40MB/Sec SCSI.

//end of long sidenote

(edit):

When using DiskSpeed to test what transferrates that could be achieved via the filesystem (as in everyday use), I got  a maximum of 32MB/Sec... not too shabby.


/Patrik

[Crusher]

Ok, but 32MB/s can I live with on an Amiga. I mean I think my A2000 with Blizzard 2060 and scsi (10MB/s) is fast, so a CSPPC with 32MB/s scsi is a dream.  :-D

I don´t own a CSPPC, yet that is, but my friend does but he thinks that buying a scsi disk is too expensive and he is happy with the internal IDE on his A4K. I bang my head against a wall everytime he says that.
The tests I did with his computer was when my cousin borrowed the Amiga and put one of his UWSCSI disks and used a program to set it to 40MB/s (probably a P5 prg). He used the computer for harddisk music recording, which worked very well.

So do you mean that it is the 68K that determines the memspeed between the CSPPC scsi and the CSPPC memory?  :-?
Or did you mean when I´m working normally in WB so I only use the 68K?
That should mean that I really should go for a CSPPC 233 with an 060?

[Acill]

Hey Rof, what is storm mesa? I've seen it before, but never tried it.

[patrik]

@Crusher:

The 68k doesnt determine the memspeed between the CSPPC scsi and CSPPC fastmem. The SCSI-chip on the CSPPC does the memory transfers by itself as it uses dma which means it accesses the memory in kindof the same way as the cpu. I was only implying the the SCSI-chip probably cant talk much faster to the memory than the 68060 as they both transfer at most 32-bits (a longword) during a buscycle (the ppc transfer at most 64-bit during a buscycle and should get atleast the double bandwidth towards fastmem) and thus a faster scsi-chip would not be able to perform much better... maybe a 10MB/Sec more with a 80Mb/Sec SCSI-chip... it was just a sidenote . The CSPPC scsi might even be able perform better in cpu-memory-bandwidth-intensive situations with lower spec cpu's as then there will be more fastmem bandwidth free for the SCSI-chip to use .


/Patrik

[Crusher]

Ok, now I follow you  :-)
Well, we can all agree that the CSPPC-scsi is fast anyway.

My friend came over today and I tried to convince him again that he should really buy a "real" harddisk for his CSPPC, he declined again. Grr.. I´ll buy a UW-disk for him and show him the speed and he´ll never go back to IDE again :evilgrin:

[Roj]

It's basically OpenGL for 3D boards. I don't have anything that uses it other than the several archives of demos that are kinda interesting. It's available here.