From: MagerValp (MagerValp_at_cling.gu.se)
Date: 2002-06-12 10:41:07
>>>>> "B" == john/lori <firstname.lastname@example.org> writes: RB> May I suggest to have a look at: RB> http://home.hccnet.nl/g.baltissen/memv20.htm B> piggy-backing also lets you put ram where the VIC can see it. B> (I think Magervalp has this written up some where, doesn't he?) In C= Hacking issue 20 I describe how to piggyback 16K internally. Ruud was kind enough to send me some 2114 RAM so I started an article on adding 3K visible for the VIC. Unfortunately I killed the 74LS133 while desoldering. There's something wrong with my VIC chip too, and I haven't really had the time to fix it (anyone have a spare PAL mother- board?). From my notes: To add 3K internally you piggyback 6 2114 on top of the internal ones (UE2 + UD2 for the first K, UE3 + UD3 for the second, etc), use /RAM1 - /RAM3 (pins 1-3 on UC4) as chip selects, and cut /RAM1 - /RAM3 on the 74LS133 (pins 4-6 on UD9). -- ___ . . . . . + . . o _|___|_ + . + . + . Per Olofsson, arkadspelare o-o . . . o + MagerValp@cling.gu.se - + + . http://www.cling.gu.se/~cl3polof/ Message was sent through the cbm-hackers mailing list
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