On Sunday, March 10, 2013, Dave Park wrote: > 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".
Again from memory but I am sure one logic chip (Altera EP1810?) now does not work. They changed the spec in some way which broke SGC. Roy Wood tracked down hundreds, and bought them. He managed to get his money back. I still have Stuart H's programming adapters he bought for my Omnipro2 and the code. > > > Tony -- [email protected] 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
