steveh@tasman.cc.utas.edu.au (Steven Howell) (05/10/91)
Due to the excellent success i had with my request on the Zilog SCC chip, i decided to post again concerning another piece of hardware that we wish to employ. We have currently designed a Video Graphics Circuit based around the Intel 82786 VCP as the core. But to our suprise, local suppliers have discontinued this chip, and Intel informed me that they are no longer manufacturing this chip. So i had a quick flick through our Co-Processor manuals to see whats avail. I found a TMS34061FNL IC claiming it was capable of delivering high qual displays and has the ability to manage its own memory. Has anyone had any dealing with this chip. Could they give me some feed back on what it is like in performance and ability to program. Would it be considered capable of producing 640x480 in 256 colours, with its own bit map memory. thanks in advance steveh
stevenw@disk.uucp (Steven Weller) (05/15/91)
[ Stuff on the Intel 82786 and TMS 34061 graphics chips omitted ] It does not surprise me that the 82786 chip was discontinued. It was very slow, due mainly to the quad porting of the graphics memory. The 34061 is pretty good. It is a video controller designed for driving VRAMs. It does all the timing for video and memory accesses but does not draw a thing - that's up to the CPU. One disadvantage is that each scan line uses a multiple of 2**n pixels (or bytes, I cannot remember). This is a result of the use of VRAM I think, and means that you can end up needing much more memory than you would expect for certain display sizes. Steve -- : Phone: (502) 425 9560 << Steven Weller >> Fax: (502) 426 3944 : : Windsor Systems, 2407 Lime Kiln Lane, Louisville, KY, 40222 USA : : "A substance almost, but not quite, entirely unlike tea" : : stevenw@disk.UUCP or uunet!ukma!corpane!disk!stevenw :