Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!lll-tis!ames!mailrus!tut.cis.ohio-state.edu!bloom-beacon!mit-eddie!bbn!rochester!PT.CS.CMU.EDU!andrew.cmu.edu!bm1q+ From: bm1q+@andrew.cmu.edu (Benjamin Jameson McCurtain) Newsgroups: comp.sys.mac.programmer Subject: screen swapping Message-ID: Date: 7 Apr 88 19:35:27 GMT Organization: Carnegie Mellon University Lines: 14 Does anyone have any pointers on how to accomplish this? I have a cruddy book with the source for megaroids, but it provides little or no explanation of the techniques. Also, the addresses are absolute, and I'd prefer vectors. At least the address of the video screens are for pre-mac plusses.. It says that 0xeffffe is the address of the VIA port to change between the primary and secondary screens. I think I found the vector in my LSC headers, but nothing I try seems to work. To display the front screen, it does *chsrcn |= 64, & then does &= ~64 do display the secondary screen, where chrsrcn is the address above. Am I missing something? Do I need to protect this memory somehow? Also, can someone recommend a *very* cheap sound digitizer for a poor college student? I'd actually prefer to build one myself, I still have my chips from my apple II days, but I'd have no idea how to interface them to the mac.. Thanks muchly, Ben McCurtain