Am 11.03.2016 21:48, schrieb Thierry Godefroy: > On Fri, 11 Mar 2016 21:16:08 +0100, Peter Graf wrote: > >>> Strange... I'd have expected that the problem was the video memory, >>> but 800x600 pixels consume less memory than 1024x512 pixels... >> >> Yes it is strange. Has to do withe the fact that neither 800 nor 600 are >> powers of two and the CPLDs are manually optimized to the last gate. > > No chance to get a "larger" (i.e. with more gates) CPLD that would fit > the same socket ?... Or perhaps by using a modern and larger (in both > size and number of gates) CPLD that would piggy-back on the old CPLD > socket via a small adpater printed circuit ?...
I have considered that, but adaptors which fit into PLCC are prohibitively expensive and hard to get. > A native 800x600 resolution would be a definitive (and probably the > best) solution to the problem, so I think it would be worth investigating > some more its feasability... Still 800x600 would require change of all three operating systems and several pieces of application software! Moreover, software that directly writes into QL 512x256 would fail, like the beloved QL Chess. >> I can display it without scaling here also, but it looks crazy with only >> about a quarter of the screen area covered. > > True, but better than a blank screen... :-P Yup. >> .../... >>> Well, depending on how many are "a few", this could be done with >>> manual wiring... >> >> If I remember correctly, it was 6 wires. > > That's definitely not a problem then: I've seen (and did) hardware mods > with more "flying" wires than this... > However, another issue with this solution could be the lack of room to > piggy-back a daughter board on the EPROM slots, especially with the 2 > ISA slots occupied and a heat-sink+fan on the 68060... It depends. Using SMD components, the board could be about as small as the ROM socket area. >> .../... >>> It would be another machine... Not sure you'd find a "market" for it. >> >> I guess not, but I'm not looking for a market anyway. The fewer people >> want it, the less work I have. The two things that still motivate me, is >> to have fun and to keep the QL alive. >> >> So the best thing will probably be to concentrate on the Q68. This cute >> piece of hardware is in working condition for more than 8 years now, >> only struggling with "soft" issues and my notorious lack of time. > > Any picture/spec sheet ? Q68 runs about QXL speed, even without the cache I am working on. Features - Plain 68000 core, 68020 nearly complete - 32 MB SDRAM - PS/2 keyboard and mouse - Two fullsize SD card interfaces - SER - Ethernet - Battery buffered RTC (and yes, the battery is separate!) - Stereo sound - Up to 1024x768 VESA VGA, QL modes in hardware - 8x10 cm board size, fitting existing nice case - Single 5V power supply I demonstrated my Q68 at the "QL is 30" show, where someone took a picture: http://www.qlforum.co.uk/viewtopic.php?f=12&t=1087&start=10 Meanwhile I replaced the wired components you see on that picture by SMD for machine manufacture. QDOS Classic and Minerva are running, but issues with QL-SD driver and Pointer Environment. All the best Peter _______________________________________________ QL-Users Mailing List
