2bc8f61e   
   From: tlake@twcny.rr.com   
      
   "Jim Leonard"  wrote in message   
   news:27c323aa-4ab9-4361-b8f9-58d2ce037f59@79g2000hsk.googlegroups.com...   
      
   > - The PCjr required a hardware modification to run some Tandy 1000   
   > programs that otherwise wouldn't display.  Does anyone know why the   
   > mod was required, especially since the Tandy 1000 was supposed to be   
   > PCjr compatible?   
      
   The jr had its video memory at a fixed location no matter how much RAM was   
   installed.   
   That's why you needed all those fixes when adding memory past the 128K mark.   
   The 1000 moved video memory based on RAM size and so could use it all with no   
   tricks.   
   >   
   > - The PCjr has a real video IRQ on IRQ 5 -- does the Tandy support/   
   > emulate that?   
      
   In the original 1000s IRQ5 was for disk support, same as jr.   
   In later models, it was configurable by the user (jumper?)   
   >   
   >   
   > - The PCjr has a very complete and detailed technical reference   
   > available; is there a similar tech ref for the Tandy 1000?   
      
   Yes, there was a very good Tech Ref manual for the original 1000.   
   I used to own one and I just saw on on eBay a couple weeks ago.   
      
   Tom Lake   
      
   --- SoupGate-Win32 v1.05   
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