Path: utzoo!censor!geac!torsqnt!lethe!yunexus!ists!helios.physics.utoronto.ca!news-server.csri.toronto.edu!cs.utexas.edu!samsung!usc!apple!agate!ucbvax!ECN.PURDUE.EDU!rferguso From: rferguso@ECN.PURDUE.EDU (Robert S. Ferguson) Newsgroups: comp.sys.cbm Subject: 1750 REU problems Message-ID: <9101180107.AA27760@gn.ecn.purdue.edu> Date: 18 Jan 91 01:07:08 GMT Sender: daemon@ucbvax.BERKELEY.EDU Lines: 27 I just got a 1750 Clone for Christmas. I worked fine when I tried it with Geos v1.3 on my parents C-128. I also loaded the demos that come with it, and they worked OK too. But, when I took it to school with me and tried it with Geos v2.0, it said there was no REU. I tried unplugging it and putting it back in, but that didn't make any difference. So I tried the test programs that came with it. The fast test on the 1750 disk said "testing..." and then it said "finished." That didn't help, so I tried the slow test. It scrolled a bunch of data before the screen suddenly went blank. Next I tried the test on the 1764 disk. Here is what that test said: 256K Expansion Ram Test Test Pass/Fail Dout Din Bnk/Addr 3 Fail 55AA FF 0 1000 (rest of test deleted) I did try the REU with a nearby 64C, and it worked fine. I think the problem is in my 128. Has anybody else had a problem like this? Any suggestions as to what I should try next would be appreciated. By the way, I don't really need the REU, but I would like to be able to use it.