The Sinclair QL Forum

I was under the impression that DMA could not be used on the Q60. It can't since there is no DMA controller on the Q60. Peter apparently took it as a reproach while I was not even speaking about the Q60 but was just saying that for a future design , a DMA mode (or more likely a bus arbitrator with ...

You came up with your Q60 CDROM experiences, then: That's how you started the dispute, of course about Q60/ISA scenario. Even with four exclamation marks... What followed were your time consuming sideways, and allocating opinions to me that I never had - just not to admit the statement was simply w...

Sorry, but you keep shifting scenarios away from what was previously discussed, instead of simply admitting you were wrong. You brought up Q60/ISA as a case where DMA would allow higher data rate. Not at all !!! I simply said that *for a modern design* (the subject of this thread), DMA was a must h...

I just kept coming back to your original point that DMA was required for faster data transfer rate, which remains wrong, no matter how you turn it. Sad that you don't admit that a well implemented DMA, able to transfer one word (with word width = bus width) at each bus or memory clock cycle is *obv...

Either way, it is the peripheral bus (ISA), not the CPU, which slows down CDROM data transfer on the Q60. DMA would not speed up the transfer. Oh yes it would !!!! No. For an ISA bus design with a CPU as fast as 68060, throughput is just a matter of generating optimal repetitive ISA bus cycles to b...

Believe me (as the implementer of the ATAPI/CD-ROM driver for the Q60), data transfer via the CPU *is* the bottleneck There were several ways to access CDROM by Duncan, Wolfgang and Thierry, so I don't know who you are, and what you mean in particular. Maybe tell us? The latter (I prefer to keep as...

My worry is that the last monitor I got that can still display the Q60 screen is over 15 years old and won't last forever (I already repaired it twice)... As mentioned earlier, I'm currently in the test phase of a stopgap solution. Less than ideal, because it leave one third of the screen black. Th...

As a happy (but worried) owner of a Q60, I'd vote for a video circuit upgrade, since LCD monitors are incapable of properly syncing the Q60 1024x512 mode (the last monitor I tried it with, an Eizo FlexScan EV2455, manages to sync it, but in VGA 640x480 mode, meaning 32 lines are missing and the hori...

Hi, This sounds interesting, but how about p1 and p2 binaries, they may also have absolute addresses referencing ROM? I don't think so (LC1 and LC2 ROM SBASIC PROCedures were used to launch the passes, so they probably took care of that...)... Or, more exactly, I don't remember all the gloomy detai...

In fact, the QL C (Metacomco C) ROM is easily convertible into a LRESPRable file: I did it 28 (or so) years ago, to free the EPROM slot of my QL and use other toolkits together with QL C. IIRC, beside an added initialization routine similar to the one already posted in this thread, I simply used a s...