A3640 V3.0 refuses to run speed test on SysInfo V3.24 ?!

[alexh]

CatHerder wrote:
The 68LC040 includes an FPU but lacks a MMU. (Memory Management Unit) It actualy DOES include an FPU. (

68LC040 - includes both CPU and FPU

Total RUBBISH! LC's have no FPU but DO have an MMU.

Will your Amiga run slower with an LC chip? Absolutely not. Will it run slower if you use specific applications requiring, or benefitting from an FPU? NO.

Again BOLLOCKS. For software requiring an FPU an LC040 will run a software FPU emulator, that is if it works at all. Performance will be terrible!

yesterday I went and read the specs from Motorola explaining the difference

.
Erm Motorola / Freescale website:

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MC68040&nodeId=0162468rH3YTLC61654622

o On-Chip Floating Point Support (Full 040)
o On-Chip Memory Management Unit(Full 040, LC040, and 040V)

http://www.freescale.com/files/32bit/doc/ref_manual/MC68LC040APPA.pdf

Sorry for sounding a bit harsh, but you appear to be quoting rubbish in the hope of flogging some inferior LC040 chips to poor unsuspecting Amiga users  :madashell:

[alexh]

If sysinfo v3.24 is the program that I remember i.e.



On high end Amiga's it is a pile of poo. It crashes on my A4000D too.

I cannot remember if SCOUT has any CPU information:
http://www.aminet.net/package.php?package=util/moni/Scout.lha

A quick google showed up this program...

http://www.elho.net/dev/amiga/sysinfo/

Did this program ever really exist... I cannot find it on the net any version let alone the last 2.26 version. Being written in 1998 might give it the edge, if I could find it.

[alexh]

@kin-hell

Something to attempt in a vain effort to be able to run the speed test on the 1994 NickWilson Sysinfo (3.24) Check your 040 libraries, perhaps revert back to commodore ones?

[alexh]

Thanks to Effy, he sold me the card orignally, not realising it was a v3.2 card.

I think he would have sold it to you regardless?

The advantage of a v3.2 card over a v3.1 card are almost nill, slight speed increase and the ability to use a GVP Phonepak!

A3640's V3.0 with the cut 'n' jump are almost good enough for most systems.

[alexh]

Not if you want to run SCSI without DMA issues.

It's not SCSI related at all. It's local bus mastering related. I've got several SCSI cards that work fine on 3.0 cards with the cut n jump.

All 3.2 does over 3.1 is it saves upto 10 microseconds per DMA cycle.

[alexh]

The SCSI protocol relies on DMA calls being correct

:rtfm: The SCSI protocol doesnt require DMA. Some SCSI cards use DMA local bus mastering, some dont. You can even switch bus mastering off on cards that dont work with a certain revision A3640 to make them work!

One of the problems with the 3.0 cards is a DMA local bus mastering problem it is NOT (as previously stated) a SCSI problem.

If your SCSI requires DMA (Like the A3000 internal SCSI) then you are going to require a -02 U209 PAL or higher or switch off DMA. If your card doesnt use DMA, you'll be alright. Simple as that.

As you say a card designed to use DMA will probably be painfully slow without it (depending on CPU power) but hey.

Cut & jump is obviously a "work-around". Do you have a link with reference to the cut & jump procedure?

The Cut n jump fixes a problem with sampling the bus signals (STERM) so your Cybervision will work. The 3.1 -02 PAL fixes the bus mastering issue. The 3.2 -03 PAL fixes the the bus mastering issue in a different way without delays of upto 10 us per DMA access (Fixes GVP PhonePak and increases throughput).

http://wonkity.com/~wblock/a4000hard/a3640ref.html

There is a better page somewhere with pictures, I'll try and find it.

This is another good A3640 site. This repair of the capcitors can sometimes resurrect seemingly dead A3640's

http://joj.home.texas.net/amiga.html

[alexh]

FFS!....>Sometimes there is just "NO" telling anyone FACT is there! Almost as bad as alexh going on about DMA.

Oops, I just wanted to say to all those out there reading that it was a local DMA issue, not necessarily a SCSI issue.

Anyhow everything is sorted. Case closed