The Sinclair QL Forum

Hi all, This topic is copied from the "SGC successor brainstorming" thread in order not to deviate to much from the initial subject. The following is the original post, followed by some additional thoughts by myself. Original post -----------------------------------------------------------...

Re: Q68 speed vs 68030 speed Yes, would be very interesting! Thank you! Hi Peter and all, I have benchmark the Q68 (SRAM area) with a 68030 @ 56mhz (not 50mhz as I first thought) The results are surprising! The benchmark program is pure 68000 machine code. It is a routine that compute the number of ...

Agreed, but only due to DRAM waitstates. If we compare for fast SRAM (thereby looking only at CPU speed) the Q68 executes many instructions in a single clock cycle, including multiplication. Even if a 16-bit databus is kept for the Q68, I doubt the 68030 still beats the Q68 at this core discipline....

Sorry if my opinions kind of diverge from many QL users... We are talking Super Gold Card replacement. Now at the time, the goal of the SGC was to add more speed and memory to the QL. It was not design to be able to play bareQL games, Although miracle system did their best so that old games would ru...

janbredenbeek wrote:It's QL5B and the sector size is 2048 bytes, so for direct access you should open 'flpx_*D4e'.

Jan.

I confirm. Freshly formatted ED disk. Sector read with "flp2_*D4e"

Francois

I have a ED drive with some floppy. I can check tonight. However, I will need to search online as I don't remember how to do direct sector access on the ED floppy. So if someone knows the correct sequence of command/utility to use let me know. François I'm looking through some old C68 code of mine, ...

If I remember well, SMSQ/E does not support microdrive.

As for GC and SGC with Minerva and QDOS, maybe the (S)GC copy the ROM in RAM and proceed with some code patching at startup ?

François

This makes more sense now on the switch side of things. The switch enable will trigger that lower of the 3 comparator's (there are 4 in the 339 package), and that in turn will switch Q6 on, allowing the SW pin to rise towards +12V, it would normally be dragged to 0.6V by the bias resistor to -12V a...

Thank you 1024MAK and Pr0f, your answers are definitely and better justified than anything I heard so far! The only remaining mystery is the fact that the switch circuit make sense only if the SW pin has a positive supply even though I have measured a negative voltage. Here is some description of th...

One quick question - as this could be a showstopper for your project... What monitor or TV do you intend to use? Light pen will only work correctly with a CRT based TV or Monitor, as the LCD doesn't have a 'light spot'. Well, not only it needs a CRT monitor, but it needs the specific high resolutio...