Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!apple!vsi1!daver!bungi.com!news From: gs@vw25.chips.com (George Scolaro) Newsgroups: comp.sys.nsc.32k Subject: Re: one step closer... Message-ID: Date: 20 Sep 90 19:36:41 GMT Sender: news@daver.bungi.com Lines: 44 Approved: news@daver.bungi.com [In the message entitled "one step closer..." on Sep 20, 12:07, Jon Buller writes:] > > These two problems have been fixed, and the pc532 now gets the correct data > out of the eprom for at least 10-15 bytes. I now need a copy of the Sounds like you still have a problem getting code out of the EPROM. > image of a "float-less" monitor, I believe that loading the cfg register is > eventually putting mine in the weeds. Is this true? or does it need to go > a LONG way to hit an fp instruction to blow it up? The setcfg of the FPU 'will not' cause the pc532 to hang. Accessing the FPU later on will though - but this is a 'long' time later. > Bruce, could you send me a copy of the float-less rom image? Thanks. Bruce is/will be on holidays for another couple of weeks. > And can anyone tell me if my guess about the cfg register is correct? (I > still need to hook it up to a terminal, one wasn't handy at the moment.) At the very least, if things are a bit working, the AIC6250 will be accessed and all the LEDs should be on, i.e. the outputs of the AIC6250 are 0 Volts. This happens within the first few instructions. I thought I sent you a copy of the first few hundred instructions or so? If the LEDs don't light then the EPROM code is still not being executed correctly. > At around 300-350 cycles the data bus had FF's on it ALL the time, is this > the DRAM initialization, or is it going off in space? Also, I pulled my > memory SIMMs from my Mac, so it is 8-bit not 9, do I just need to leave out > the parity pal, or can I leave it in, or is there some other hack that's > needed? If you don't have 9 bit drams (for parity) then you must remove the parity pal, otherwise you will get NMI asserted on the first parity error, which of course will happen pretty quickly after the 532 reads dram! regards, -- George Scolaro (gs@vw25.chips.com) Chips & Technologies (408) 434-0600 3050 Zanker Road San Jose, CA 95134