Yes the capacity is 1 Mbit, but unlike 'true' 1 Mbit chips they can store and output 4 bits at once. Which is probably the reason why the Trump Card 2 was faster - there are less refresh cycles needed during which the 68008 has to wait for RAM access.XorA wrote:That still makes 1 megabit, so I am a little confused what you mean!janbredenbeek wrote:Yes, but the RAM chips are really 4 bit ones. There's a circuit diagram in the same directory (http://gigant.chem.elte.hu/ZXSpectrum/QL_Trump_Card/) where the picture resides and that clearly shows each chip has 4 data lines.XorA wrote: 256K x 4 bit is 1 megabit so its talking about the TC2
Jan.