exxos's Atari, Amiga & retro forum

PaulJ wrote: 12 Apr 2019 17:21 US with RateHD 896 K/s you/icky proto IDE with IDC drive ~1420 K/s = ~60% improvement.

The ACSI port is only 8bit, CPU & IDE is 16bit.

However the CPU takes more cycles to access RAM than DMA does. So if you ran 8bit on the CPU, it would be slower than the DMA port.

exxos wrote: 12 Apr 2019 17:33

PaulJ wrote: 12 Apr 2019 17:21 US with RateHD 896 K/s you/icky proto IDE with IDC drive ~1420 K/s = ~60% improvement.

The ACSI port is only 8bit, CPU & IDE is 16bit.

However the CPU takes more cycles to access RAM than DMA does. So if you ran 8bit on the CPU, it would be slower than the DMA port.

My thoughts also, The driver via DMA reads data from the drive into a memory buffer, possible issue here.. Does the driver read two bytes and write to memory once.. or does it read byte, write byte. Using DMA I would bet its read byte, write byte.. On the iDE one would hope its read word, write word. Guess one needs to understand the driver software to analyze the operation. It is encouraging to see a noticable speed improvement with the IDE interface. :) :) :)

The good news is everything I have connected so far works except the one CF, which I will send to exxos to try. As it works on the PC.

The biggest pain is having to partition larger drives up into lots of small partitions to make it compatible with TOS. Does anyone know the partition size limit for Emutos as I'll probably burn that to Rom too and see how it works with that?

As I'd mentioned to Icky, I've been thinking of seeing if I can adapt the IDE board to run from the mega bus. It's probably going to involve a whole shed load of jumper cables at first.

PhilC wrote: 12 Apr 2019 18:11 The good news is everything I have connected so far works except the one CF, which I will send to exxos to try. As it works on the PC.

:bravo:

Does that card simply not work at all then ?

exxos wrote: 12 Apr 2019 19:44

PhilC wrote: 12 Apr 2019 18:11 The good news is everything I have connected so far works except the one CF, which I will send to exxos to try. As it works on the PC.

:bravo:

Does that card simply not work at all then ?

the computer won't even get as far as changing the monitor to 50hz with it connected.

PhilC wrote: 12 Apr 2019 19:46 the computer won't even get as far as changing the monitor to 50hz with it connected.

wow, is it shorting out one of the signals to gnd or something ?!

exxos wrote: 12 Apr 2019 19:54

PhilC wrote: 12 Apr 2019 19:46 the computer won't even get as far as changing the monitor to 50hz with it connected.

wow, is it shorting out one of the signals to gnd or something ?!

It must be something daft like that. I've used it on a USB to IDE adaptor and a USB to CF adaptor on my laptop and all is fine though.

And here's the IDE board, finally complete thanks to labelling from Icky :lol:

PhilC wrote: 13 Apr 2019 13:01 And here's the IDE board, finally complete thanks to labelling from Icky :lol:

Everything in Ickys house has a label apparently, now he seems to be expanding his territory :lol:

exxos wrote: 13 Apr 2019 13:14

PhilC wrote: 13 Apr 2019 13:01 And here's the IDE board, finally complete thanks to labelling from Icky :lol:

Everything in Ickys house has a label apparently, now he seems to be expanding his territory :lol:

I wonder if he's labelled his wife and daughter yet?