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Posted Thu Feb 2, 2012 7:30 AM
Posted Thu Feb 2, 2012 10:54 AM
Please don't hang me if I'm wrong on this...
There's a version of GFA Basic (Or is it assembler? I have it at home and I'm at work right now) that does support the 68881 and not the 68882.
Also some benchmarks do see the 68881 and not the 68882. But these do use the 68882 as the results are fast calculation results.
And if memory serves right, the Atari FPU card will only work with the 68881 due to the way it's accessed. Though I'm not 100% about this last one.
Posted Thu Feb 2, 2012 11:12 AM
Posted Thu Feb 2, 2012 4:21 PM
Posted Thu Feb 2, 2012 6:19 PM
Posted Thu Feb 2, 2012 11:11 PM
Hello Lynxpro and DarkLord,
Just now I had a look. And it's GFA Basic that uses the 68881.
The point was that some programs don't recognise the 68882 but would use the 68881.
If memory serves right, it had to do with so called Line-F of Line-A access of memory-mapped access.
But as I'm not very familiar with the 68000 software, I'm not aquainted with the details.
Edited by Lynxpro, Thu Feb 2, 2012 11:13 PM.
Posted Thu Apr 19, 2012 9:35 AM
Just out of curiosity, what programs are known for working with the 68881 but not the 68882?
; This Subroutine returns true in d0 when an MC68882 is installed, ; false otherwise. testMc68882: move.l d1, -(sp) moveq.l #0, d0 moveq.l #0, d1 fsave -(sp) move.b 1(sp), d1 cmp.b #$18, d1 beq.s is68881 moveq.l #1, d0 .is68881: frestore (sp)+ move.l (sp)+, d1 rts
Edited by Ato, Thu Apr 19, 2012 9:44 AM.
Posted Thu Apr 19, 2012 5:24 PM
Posted Wed May 2, 2012 12:06 AM
Edited by HiroProX, Wed May 2, 2012 12:07 AM.
Posted Wed May 2, 2012 6:46 AM
BTW, if you look at the mainboard for an A1200, the traces and pinout for an FPU is present. Now if this works or is just an artifact from an earlier revision (like the label for it being a 1mb or 2mb board) is unknown as far as I know.
Posted Fri Nov 2, 2012 7:32 AM
The name of the extension card is Atari SFP004. Installation manual: http://www.atarimani...o-processor.pdf and some pictures: http://www.maedicke....ware/sfp004.htm
And I have to apalogise because I was wrong. It was not a ROM-port card but one for the Mega-ST internal 68000 expansion bus. Sorry again for the wrong information.
Whoopsy Daisy! Quite some improvement. Would be really nice if you could add support for the FPU-on-a-card for later comparison if we find somebody who has got one. :-)
Posted Tue Jan 8, 2013 5:41 PM
Posted Tue Jan 8, 2013 7:25 PM
Hi, I have myself the Atari SFP004, but I am unable to find any SW that would be able to use it. I am particularly looking at Fortran compiler that I used to have back in 80' when I used it for numerical calculations. It all went by when I sold my Atari stuff... Now back I was able to get the SFP004 but not single SW package. I know that there should exist GFA Basic that can utilize the 68881, but I prefer Omikron Basic (this is much faster then GFA even without the 68881) but I not sure if there was ever a version supporting the 68881 co-processor.
Posted Wed Jan 9, 2013 8:32 AM
This doesn't affect Falcons or TTs at all since they are 030 based.
Posted Wed Jan 9, 2013 8:59 AM
So can we safely assume that it wouldn't affect accelerated machines with '030 CPU's
Posted Wed Jan 9, 2013 10:27 PM
Posted Thu Jan 10, 2013 7:32 PM
Posted Fri Jan 11, 2013 6:12 AM
There are megabus graphics cards which have an FPU slot to upgrade the 68000 in the Mega ST.
I had two of them, but I gave them away, not remembering the names anymore. I do believe both to have been Matrix cards. (Darklord, listen to this! Upgrade your STacy with a Matrix megabus graphics card!)
Posted Fri Jan 11, 2013 6:19 AM
Posted Fri Jan 11, 2013 7:14 AM
(Darklord, listen to this! Upgrade your STacy with a Matrix megabus graphics card!)
Posted Fri Jan 11, 2013 7:29 AM
Edited by jens, Fri Jan 11, 2013 7:40 AM.
Posted Sat Jan 12, 2013 7:18 AM
Posted Tue Aug 27, 2013 4:32 PM
Posted Tue Aug 27, 2013 7:23 PM
Posted Wed Aug 28, 2013 11:05 AM
Well after searching around for the chip mfg logos I figured out that the previous post I made was linking to chips made by Freescale and ON Semiconductor. I assume they are the same as the Motorola mfg parts.
ON Semiconductor was part of Motorola and Freescale is what has become of Motorola. So it should be OK.
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