The Gold Card and Super Gold Card are quite different in this respect. The custom logic on the GC and SCG that I have are both Altera chips that max out at 50MHz, which gives a top CPU speed of 25 MHz. However, the SGC clocks the CPU at 24MHz, probably because that frequency allows faster memory transfers than at 25 MHz which could cause additional wait states. The 68EC020 was the fastest one made, 25 MHz, though a full 68020 was available as a 33 MHz version in a different package. However, the CPLD will not run at 66 MHz.
The 68000 in that socket style did have an FN20 (20 MHz) version, and swapping the CPU and clock IC might have the desired result, or it might not. I don't know if the contents of the custom logic in the cards is the same or different, but both the ones I have here have EPROMS with the same contents, both labelled "SGC 2.49". Dave On Sat, Mar 9, 2013 at 7:09 PM, Francois Lanciault < francoislancia...@hotmail.com> wrote: > Ok then what about the GoldCard ? The 68000 is socketed I believe. > > F. > > On 2013-03-09, at 18:32, Tony Firshman wrote: > > > On Saturday, March 9, 2013, Francois Lanciault wrote: > > > >> A stupid idea just came up to me. > >> > >> Knowing that it is difficult for various reasons to make a 680X0 board > as > >> fast or faster than the GoldCard, would it be possible to... make an > >> accelerator board for the GoldCard itself ? (Or SGC for that matter). > >> > >> Some kind of daughter board that would fit in the 68000 socket. All the > QL > >> address decoding and shadowing of memory would still be taken care by > the > >> GC but maybe a daughter board could run at a faster speed, especially > if it > >> has its own fast memory. Imagine a SGC fitted with a 68030 or a 68040 > >> daughter board :-) > >> > >> I have no knowledge of electronic board design so don't laugh to loud. > >> > >> Otherwise it is always nice to see someone working on original hardware > >> ad-ons > > > > > > Not laughing but the processor, on SGC certainly is soldered in > underneath > > another chip. I know that as Stuart H did a bodge job on some and I had > to > > rescue them. They were Quanta boards I think. > > > > Tony > > > > > > -- > > t...@firshman.co.uk http://firshman.co.uk > > Voice: +44(0)1442-828254 Fax: +44(0)1442-828255 Skype: tonyfirshman > > TF Services, 29 Longfield Road, Tring, Herts, HP23 4DG > > _______________________________________________ > > QL-Users Mailing List > > http://www.q-v-d.demon.co.uk/smsqe.htm > > > > _______________________________________________ > QL-Users Mailing List > http://www.q-v-d.demon.co.uk/smsqe.htm > _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
