Tabakal@UB.CC.UMICH.EDU (10/31/90)
Well, here we go again. The continuing tales of the ASIC high speed 65816 chip as dictated to me by Tony Fadell. This chapter is in response to some of Jawaid Bazyar's requests for features to implement a multi-tasking operating system for the GS: Thanks for the news!... Let me clarify some things first.. We did not implement the ABORT pin on the '816 because the original version of the '816 had problems with abort during REP,SEP, and 2 other addressing modes (I don't remember them off hand) We chose instead to put in a page mode pin .. in the words of Jawaid "high speed bank memory access." This will allow you to only have to specify part of the address instead of the whole address to make writes to memory up to 8 times faster. Apple told us if they had such a pin they could make the GS run at 8Mhz on the motherboard with little change to the existing design. As far as the Motorola parts are concerned I have not looked at their spec sheets. I would think it is very possible to integrate one of the chips. The chips are layed out and are now in fab.. More details to come.. ----------------------------------------------------------------------------- Todd A. Bakal All snappy sayings aside, U of M Apple User's Group !Index will be updated Ann Arbor, Michigan ASAP or my name's not... Internet: Tabakal@ub.cc.umich.edu FTP: ummts.cc.umich.edu Tab@terminator.cc.umich.edu 35.1.1.43 (PC5:) UUCP: ...!uunet!ub.cc.umich.edu!tabakal BITnet: Tabakal@UMICHUB