levi@kodak.UUCP (Ilia Levi) (03/22/89)
Does anybody have instructions on how to upgrade Atari 400 to 64K using 64Kbit chips?
clf3678@ultb.UUCP (C.L. Freemesser) (03/22/89)
I don't believe that you can expand a 400 to 64k. The highest it will go (the highest I've ever heard it can go) is 48k. I believe Axlon made a board that did this, and POSSIBLY Atari had one at one time. If you want 64k, you will have to get an XL/XE. =cf=
jcbst3@cisunx.UUCP (James C. Benz) (03/31/89)
In article <483@ultb.UUCP> clf3678@ultb.UUCP (C.L. Freemesser (709ITP)) writes: >I don't believe that you can expand a 400 to 64k. The highest it will >go (the highest I've ever heard it can go) is 48k. I believe Axlon made >a board that did this, and POSSIBLY Atari had one at one time. If you >want 64k, you will have to get an XL/XE. > >=cf= Oh yes you can, but the 400 can only access 48K without bank switching. I have a 400 at home (in the closet now - unused) with 64K and a variety of BASIC (yecch) programs that use the extra 16K. Haven't used it in a *long* time (since I got 800XL as a gift) but it requires poking a value into some register telling the processor to access the other bank. There were at one time several 64K upgrades for the 400, but none that I know of now. installation of the upgrade board required soldering two jumpers on the motherboard (yikes!) so it's not a trivial upgrade. -- Jim Benz jcbst3@unix.cis.pittsburgh.edu If a modem University of Pittsburgh answers, UCIR (412) 648-5930 hang up!