DMA port "update" ideas..

Post by **Icky** » Mon Oct 22, 2018 11:44 pm

exxos wrote: ↑Mon Oct 22, 2018 11:40 pm
Icky wrote: ↑Mon Oct 22, 2018 11:34 pm Nope its booted - The 16MHz needed to be buffered so I took it from the 16MHZ_BUFFERED_1 that was spare on IC900 pin 12
oh sweet! benchmark time then

Spoke to soon its temperamental. Went to put in the HDD and it did not boot. No signal this time.

Put it back to 8MHz and its working again.

Post by **exxos** » Mon Oct 22, 2018 11:48 pm

Icky wrote: ↑Mon Oct 22, 2018 11:44 pm Spoke to soon its temperamental. Went to put in the HDD and it did not boot. No signal this time.

Put it back to 8MHz and its working again.

Assume you going through a 33R resistor to the DMA clock pin ?

Post by **Icky** » Tue Oct 23, 2018 12:00 am

exxos wrote: ↑Mon Oct 22, 2018 11:48 pm
Icky wrote: ↑Mon Oct 22, 2018 11:44 pm Spoke to soon its temperamental. Went to put in the HDD and it did not boot. No signal this time.

Put it back to 8MHz and its working again.
Assume you going through a 33R resistor to the DMA clock pin ?

You assume right

It does seem to be temperamental on 16MHz

Post by **exxos** » Tue Oct 23, 2018 12:04 am

Icky wrote: ↑Tue Oct 23, 2018 12:00 am It does seem to be temperamental on 16MHz

Could be interfacing issues to the MMU, or the DMA might not just cope with it. Up the voltage a bit, see if it helps

Post by **Icky** » Tue Oct 23, 2018 12:10 am

exxos wrote: ↑Tue Oct 23, 2018 12:04 am
Icky wrote: ↑Tue Oct 23, 2018 12:00 am It does seem to be temperamental on 16MHz
Could be interfacing issues to the MMU, or the DMA might not just cope with it. Up the voltage a bit, see if it helps

Will take a better look tomorrow.

Post by **Icky** » Tue Oct 23, 2018 6:55 pm

Icky wrote: ↑Tue Oct 23, 2018 12:10 am
exxos wrote: ↑Tue Oct 23, 2018 12:04 am

Could be interfacing issues to the MMU, or the DMA might not just cope with it. Up the voltage a bit, see if it helps
Will take a better look tomorrow.

Yep got it stable with a bit more juice

However although its running at 16MHz the Gigafile is not recognised @ 16MHz. Drop back down to 8MHz and it sees it

Post by **exxos** » Tue Oct 23, 2018 7:07 pm

Icky wrote: ↑Tue Oct 23, 2018 6:55 pm Yep got it stable with a bit more juice

However although its running at 16MHz the Gigafile is not recognised @ 16MHz. Drop back down to 8MHz and it sees it

Does the floppy still work ?

Post by **Icky** » Tue Oct 23, 2018 7:11 pm

exxos wrote: ↑Tue Oct 23, 2018 7:07 pm
Icky wrote: ↑Tue Oct 23, 2018 6:55 pm Yep got it stable with a bit more juice

However although its running at 16MHz the Gigafile is not recognised @ 16MHz. Drop back down to 8MHz and it sees it
Does the floppy still work ?

Yes the floppy works fine.

EDIT: @16MHz

Post by **exxos** » Tue Oct 23, 2018 7:13 pm

Icky wrote: ↑Tue Oct 23, 2018 7:11 pm Yes the floppy works fine.

EDIT: @16MHz

If you can format a floppy fully, it will test the DMA out at the higher speeds better...

Assume gigafile doesn't like the faster port speed

Post by **Icky** » Tue Oct 23, 2018 7:21 pm

exxos wrote: ↑Tue Oct 23, 2018 7:13 pm If you can format a floppy fully, it will test the DMA out at the higher speeds better...

Assume gigafile doesn't like the faster port speed

I'll give that a go shortly - need food first

DMA port "update" ideas..

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