XPost: comp.sys.cbm, rec.games.video.classic   
   From: MagerValp@cling.gu.se   
      
   >>>>> "PB" == Payton Byrd  writes:   
      
   PB> The C64's slow disk access had nothing to do with the DOS, but was   
   PB> a side-effect of an industrial engineer getting too happy with the   
   PB> cutting knife and removing a motherboard trace that the Kernal   
   PB> programmer was depending on. Before the error was caught over   
   PB> 100,000 boards had been produced and the Kernal programmer had to   
   PB> scramble to fix the Kernal in both the C64 and the 1541 to work   
   PB> without the trace and all of the boards had to have the updated   
   PB> Kernal retrofitted.   
      
   What? Where on earth did you come up with that?   
      
   IEC is slow because of the 6522 shift register bug, forcing Bob   
   Russell to implement it with bit-banging when doing the VIC-20 kernal.   
   He chose a slow but reliable bitrate, as he didn't have time to test   
   it properly before shipping. IEC is slow on the C64 because management   
   wanted it to be compatible with the 1540 disk drive. Badlines screwed   
   that up, and therefore it's even slower on the C64. Fast serial is   
   available on the C128 + 1571 as they use 6526 chips, with working   
   shift registers.   
      
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