From: nelsonse48@gmail.com   
      
   On Tuesday, November 29, 2022 at 11:59:01 AM UTC-6, Steven Nelson wrote:   
   > On Tuesday, November 29, 2022 at 10:01:15 AM UTC-6, waynej...@gmail.com   
   wrote:    
   > > Have you tried reseating all the socketed chips?   
   > Removed all interface boards before doing system test. Reseated the 8 ram   
   chips, the emu, the you, and the zip chip (cpu). No effect. Still trying to   
   determine if or which ram chips are bad. I ordered 16 4164 ram chips from   
   Jameco but none of them are    
   helping. I don't know if they are CAS before RAS.   
      
   Still confused on RAM errors.  The video screen is displaying correctly now.    
   System check shows "RAM    11000111"  which to me shows errors in chip   
   locations 6  7 8 11 12 13.  But a 48k ram check shows no errors.  In monitor   
   "co50 c053 c054 c057 n 265:   
   ff n 266<265.bffem 266<265.bffev 265:0 n 266<265.bffem 266<265.bffev 34:14 "   
   (space after 34:14 then return)  The AppleII will go to HGR mode and display   
   white and dark graphic screen along with question marks and inverse @   
   characters at the bottom of    
   the screen.  If some RAM chips are bad, faulty addresses will be printed on   
   the bottom of the screen.  I get the flashing black/white screen and inverse @   
   but solid blob instead of ? char.  This is a enhanced //e and not a ][+ so   
   that may be the reason    
   for ? char difference.  Anyway, no faulty ram are indicated.  In Applesoft,   
   trying "10 ?6+3"  then run gives sysntax error in line 65xxx.  So definitely a   
   problem in upper 16k.  ROM or RAM?   
   If system check shows bad ram why doesn't 48k ram test show bad ram?  I   
   changed all the RAM chips but the system check always shows the same RAM   
   pattern.  Swapping a 0 chip with a 1 chip doesn't change anything.  I am not   
   trusting the system check at    
   this point.  Next step is to hook up a disk drive and see if I can boot a   
   diagnstic disk.  Not sure a system will load though.  I think I need to   
   isolate the problem(s) first.  Thnx for any help.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)