Path: chuka.playstation.co.uk!news From: Nick Slaven Newsgroups: scee.yaroze.freetalk.english Subject: Re: Interesting memory card fault Date: Wed, 10 Jun 1998 00:31:47 +0100 Organization: PlayStation Net Yaroze (SCEE) Lines: 34 Message-ID: <357DC5E3.ED113875@compuserve.com> References: <357C8169.9A5E5C0A@compuserve.com> NNTP-Posting-Host: ld37-114.lon.compuserve.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 4.04 [en] (Win95; I) Toby Sargeant wrote: > On a yaroze maybe that's 'system' memory, but on a grey playstation it's > only the first 64k. So no, it's not memory mapped. Hmm well thats that idea out the window then :( > really, seeing as the controllers are serial devices, and so they're pretty > hard to memory map (or at least, more difficult than providing the standard > serial registers). well, the psion organiser range of computers works on a serial bus, all you see from a programming perspective is a memory address, the nitty gritty of getting the info down a serial address/data bus is handled by the hardware, I was thinking maybe the playstation was similar, it must be something like this as the memory cards are on the same interface, & they are addressable. > What I'd really like to know is whether the pads can > generate an interrupt or whether they're polled. not of course that we'd > ever be privvy to information like that, but it would be nice to have a > keyboard attached to a controller port, and polled I/O would be a lot more > cumbersome for something like that. > > toby. good question !! cheers Nick -- http://www.netyaroze-europe.com/~nslaven/