DSEAH@WPI.BITNET (04/23/88)
If you write to a //e I/O location, you won't read back what you wrote. To maintain compatibility with the Apple ][+ yet to provide exhancements to the Apple //e, some locations are used "twice". You write to location xx to set something, and read xx to find out something else. The Apple //e Reference Manual is a good source for information regarding use of the auxiliary memory. So, so have to keep track of what bank of memory you are using yourself. Incidentally, I think the location for the push buttons are $C061-$C063. To verify that your Ramcard does work, you may wish to try this small program. Get into the monitor and type this in: * <- monitor prompt *300:18 4C 11 C3<return> *3F8:4C 00 03<return> This program will make a new monitor move command. If you type *2000<2000.3FFF<ctrl-y><return> the stuff in auxiliary memory 2000 to 3FFF will be moved to main memory starting at 2000. To move stuff from main memory to auxiliary memory, change the 18 at $300 to 38. Then the above command will move data from main memory 2000 to 3FFF to auxiliary memory starting at 2000. Try putting a picture in main memory (2000-3FFF) and moving it to auxiliary memory. Load in a different picture, change the bank to the next one in your ramcard, and move the picture again. Then clear hires page 1 and see if you can load the picture back. $300 must be 18 for auxmem->main, 38 for main->auxmen. +-----------------------------------------------+---------------------------+ | Bitnet: DSeah@WPI.Bitnet | We can't receive files! | | Internet: DSeah%WPI.Bitnet@CUNYVM.CUNY.EDU | EMAIL only! Apples Rock! | +-----------------------------------------------+---------------------------+
dcw@sun-bear.lcs.mit.edu (Dave Whitney) (08/10/89)
For those who want to buy RAM chips *very* cheap, I suggest the Chip Merchant at 1-800-426-6375. I just bought 2 megs (1meg chips) for $186. (incl. shipping!) These are 1megx1 80ns chips, more speed than you need in a //. CAS before RAS and stuff (these chips will work on a GSRam +). They take cash or cashier's check COD. No credit. Their ads say "prices subject to drop without notice." It's true. I called and asked three days ago, and it was about $200 for 2meg. Friendly service, etc... (no way related to this Co., just satisfied. We'll see if the chips actually *work*, but I have no fears.) Dave Whitney dcw@sun-bear.lcs.mit.edu ...!mit-eddie!sun-bear!dcw dcw@athena.mit.edu My employer pays me well. This, however, does not mean he agrees with me. I wrote Z-Link & BinSCII. Send me bug reports. I use a //GS. Send me Tech Info.
dcw@sun-bear (Dave Whitney) (08/16/89)
Well, I got the RAM today, and it works just dandy. I ran it through that RAM tester (pretty gruelling test), and it passed happily. I wholeheartedly recommend The Chip Merchant. I don't have their 800 number handy, but here's the info that's on the shipping box: THE CHIP MERCHANT 9285 Chesapeake Dr. Ste. L San Diego, CA 92123 619-268-4774 (I have no association with The Chip Merchant, except as a satisfied customer) Dave Whitney dcw@sun-bear.lcs.mit.edu ...!mit-eddie!sun-bear!dcw dcw@athena.mit.edu My employer pays me well. This, however, does not mean he agrees with me. I wrote Z-Link & BinSCII. Send me bug reports. I use a //GS. Send me Tech Info.
ralphw@ius3.ius.cs.cmu.edu (Ralph Hyre) (08/19/89)
>I suggest the Chip Merchant... >take cash or cashier's check COD. No credit. Their ads say "prices subject Not a malign chip merchant. I'd fear anyplace that wouldn't take credit cards, since you're limited for alternatives like chargebacks if they start jerking you around. (ie won't accept returns, etc.) -- - Ralph W. Hyre, Jr. Internet: ralphw@{ius{3,2,1}.,}cs.cmu.edu Phone:(412) CMU-BUGS Amateur Packet Radio: N3FGW@W2XO, or c/o W3VC, CMU Radio Club, Pittsburgh, PA "You can do what you want with my computer, but leave me alone!8-)"