From: me@yyzkevin.com   
      
   on the topic of duke3d,  I have not been able to get any version to crash   
   including the one listed above.    I would not say this is conclusive of   
   anything, but it is perhaps potentially maybe might be could be promising...   
   still need to test on some    
   other machines, of which working I have the  50Z with IBM 486 Planar,  and    
   the PCServer 500 S/390 which I can pop out to try the soundcard in.   
      
   The adlib distortion/jibberish was really bothering me, something so simple   
   having issues.    I started trying to understand a bit more.  I was measuring   
   the channel ready signal and I would often see what to me were unexpected   
   transitions as I currently    
   understand that every slot has its own channel ready signal,  and the system    
   logically or's them together to drive a common channel ready return.  I saw   
   the various historic discussions  mentioning  system speed etc, programs not   
   having delays,   the     
   JP5 (channel ready) and it all ending at   the :solution: being creatives CQM   
   chip that always responds quickly.   
      
   in any case, I thought perhaps   asserting the channel ready only briefly was   
   not enough as the default extended cycle varies per system.  so  I made some   
   changes  converting the  ready signal to a latch and clearing it some clock   
   cycles later...     and    
   then initially I thought it was magic I was hearing near perfect adlib   
   audio,   but then I heard a glitch here and there and while 1000% improved   
   something was not right.   
      
   I was seeing propagation delays between my test signals I could not explain   
   and then while looking at the hardware I noticed something.      My board is   
   all populated with 74HCT family chips.  While by itself this would not have   
   jumped out at me,   the    
   note from TubeTime is concerning:   
      
   "Logic chips are all specified as AHCT, but ALS or ACT may also be used. Do   
   not use LS or HCT devices, particularly for U2, since Micro Channel is a much   
   faster bus than ISA and this logic is not quite fast enough to meet the timing   
   margins. "   
      
   So I may be using a unpredictable wildcard here for my testing,  I will need   
   to see if this part substitution  may be contributing to the adlib issues.    
   why adlib and not soundblaster?  I suppose the  dsp commands are by design   
   very slow due to the "   
   inbox/outbox" and status register topology,  and  during audio playback with   
   DMA this presumably has some differences causing it to not fall victim to a   
   potentially timing tolerance issue of these out of spec chips. no sure.   
      
       Another user on the  facebook group mentioned the same  adlib symptom on   
   some systems,   i've asked them where they got the board and when it was   
   made,  I may follow up and ask what family the logic chips are.  maybe it   
   means nothing.   
      
      
      
   On Saturday, 1 July 2023 at 22:03:29 UTC-4, Ryan Alswede wrote:   
   > >> after. Some games may have intentionally not been clearing the interrupt   
   flag for some other reason, these will not be happy. This is all just   
   experimentation in fun at this point. quite a hack.   
   > Try Duke Nukem 3D basic version with your TSR work around for fun. Atomic   
   edition works. Basic 3D does not.    
   >    
   > Located here if you don't already have a copy.    
   > https://archive.org/details/duke-3-d   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)