> On Jun 6, 2018, at 5:17 PM, Jim Manley via cctalk <cctalk@classiccmp.org> > wrote: > > ... > I'm one of the early senior docents at the Computer History Museum in > SillyCon Valley and yammered on endlessly about the 6600 and its neighbor, > the 7600, but I never thought about character generation on the displays > beyond it being vector-based drawing. I'm pretty sure it was done via > look-up tables that directed the beams along vectors on the displays for > the operating PDP-1 we play Spacewar! The crazy thing about the 6000 series display controller is that it doesn't use tables at all. The selection of what stroke step to produce for a given character and point in time is defined by a very large collection of gates. The 170 controller does use table lookup (a ROM with the equivalent information). I wonder why a ROM wasn't used in the 6000. Perhaps they couldn't find a cost-effective technology that's fast enough? Core rope would work just fine for this, but not at 100 ns cycle time. paul
- CDC 6600 display character generation Noel Chiappa via cctalk
- Re: CDC 6600 display character generation Toby Thain via cctalk
- Re: CDC 6600 display character genera... Eric Smith via cctalk
- Re: CDC 6600 display character generation Paul Koning via cctalk
- Re: CDC 6600 display character genera... Toby Thain via cctalk
- Re: CDC 6600 display character ge... Paul Koning via cctalk
- Re: CDC 6600 display character ge... Chuck Guzis via cctalk
- Re: CDC 6600 display characte... Paul Koning via cctalk
- Re: CDC 6600 display cha... Jim Manley via cctalk
- Re: CDC 6600 display... Paul Koning via cctalk
- Re: CDC 6600 dis... Jim Manley via cctalk
- Re: CDC 6600 dis... Paul Koning via cctalk
- Re: CDC 6600 dis... Chuck Guzis via cctalk
- RE: CDC 6600 display characte... Rick Bensene via cctalk
- Re: CDC 6600 display cha... Paul Koning via cctalk
- RE: CDC 6600 display... Rick Bensene via cctalk
- Re: CDC 6600 dis... Paul Koning via cctalk
- Re: CDC 6600 dis... Mark J. Blair via cctalk
- Re: CDC 6600 dis... William Donzelli via cctalk
- Re: CDC 6600 display character genera... Lars Brinkhoff via cctalk