Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!att!alberta!calgary!enme.UCalgary.CA!deraadt From: deraadt@enme.UCalgary.CA (Theo de Raadt) Newsgroups: comp.sys.amiga.tech Subject: Reading the Amiga OKI clock chip Keywords: OKI MSM6242RS RTC Message-ID: <1403@cs-spool.calgary.UUCP> Date: 18 May 89 11:29:21 GMT Sender: news@calgary.UUCP Reply-To: deraadt@enme.UCalgary.CA (Theo de Raadt) Organization: U. of Calgary, Calgary, Alberta, Canada Lines: 25 I am in need of proper documentation for accessing the OKI chip on the Amiga 2000 or 500. Looking in the A500/A2000 Technical Reference Manual, I find some documentation on the chip, conflicting in some cases. The section on the chip, says the base address is $dc0000. Looking at the PAL equations a little later on in the book, I read that the chip maps into $d80000 - $d8ffff. Nice going guys. Which is it? It appears that the chip maps into long words, reading and writing the lowest nybble of the word. Is this right? Ie. register 5 is at base_address + 5*4.. right? What is this that I read about overlap between the custom graphics chip registers and the RTC? If the chip is at $d80000 - $d8ffff then there is no overlap, is there? Or do the graphics chips go down below $dff000 much? This is for Minix.. and also so that I can write a little program for myself to clear the test and stop bits - I hate when that happens and the clock does not work; that is what the problem is, right? Enough "right?" for tonight...