Checksum: 27007
Path: utzoo!utgpu!anakin
From: anakin@gpu.utcs.toronto.edu (Anakin Research)
Date: Thu, 26-Jan-89 21:05:50 EST
Message-ID: <1989Jan26.210550.10129@gpu.utcs.toronto.edu>
Organization: University of Toronto Computing Services
Newsgroups: comp.sys.amiga
Subject: Re: Lucas Accelerator
References: <6731@louie.udel.EDU> <819@faui10.informatik.uni-erlangen.de> <602@boing.UUCP>
Reply-To: anakin@gpu.utcs.UUCP (Anakin Research)

>451061%UOTTAWA.BITNET@CORNELLC.CIT.CORNELL.EDU (Valentin Pepelea) writes:
>>my Amiga 1000, and are successful in loading up KS 1.1 and WB 1.1 but if I loa
d
>>instead KS 1.2 or 1.3, then the Amiga hangs up on me before showing the WB
>>screen.
>You don't have an 68881 ?
>Since Kick1.2 the OS checks if the coprocessor for 68881
>This is done with a Coprocessor instruction. This instruction will never
>terminate if the Coprocessor cycle isn't terminated with a DTACK.
>The solution is to connect the ChipSelect with DSACK1 on the 68881.
 
>>Nope, if the 68881 is not there he should pull on buserr I think, signifying
>>that an access to an unattached coprocesor device has been made.
>>If the 68881 then standard bus protocol should be used.
 
>>I could be wrong, it has been a while since we worked on that code and had
>>the state anylizer hooked up testing the coldstart sequence.
 
 
 
>>-- 
>>Dale Luck     GfxBase/Boing, Inc.
 
 
        Oops! I'm afraid I don't pull *BERR if the Coprocessor ain't there.
Does anyone else. Boy ya learn something new every day. I must admit that
this makes perfect sense, Dale. Atleast his machine would GURU instead of
going off to la-la land. I humbly appologise.
 
                                        Brad
 
BTW Valentin, does the board work now with the 881 installed?