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Icky - Progress
Re: Icky - Progress
You could try a higher value in series with pin 38 I think it was... 500R or even 1k.. Not much else to try really..
Re: Icky - Progress
It needs to be open collector as there can be multiple DMA devices driving it.exxos wrote: Mon Oct 08, 2018 10:03 pm
It only seems to say is driven with a open collector, but does not really say is needed for any reason..
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2
Need testing : Falcon with CT2
Re: Icky - Progress
But there isn't, only Hard Drive port..rpineau wrote: Tue Oct 09, 2018 2:23 am It needs to be open collector as there can be multiple DMA devices driving it.
Re: Icky - Progress
Oh yes. my mistake, I was thinking of it as an output 
.. but it's an input from DMA port to DMA via the gate so the gate output is connected to only one device .. the DMA chip.
.. but it's an input from DMA port to DMA via the gate so the gate output is connected to only one device .. the DMA chip.Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2
Need testing : Falcon with CT2
Re: Icky - Progress
Tried 500R and it doesn't see drives at all just stuck on white screenexxos wrote: Tue Oct 09, 2018 12:44 am You could try a higher value in series with pin 38 I think it was... 500R or even 1k.. Not much else to try really..
Re: Icky - Progress
Odd.. so another odd dma issue to look into then... see how things go with the new LS chip first though.. maybe its the delay which makes the magic..Icky wrote: Tue Oct 09, 2018 10:21 pm Tried 500R and it doesn't see drives at all just stuck on white screen
Re: Icky - Progress
Just got the chips today. Starting to take a look now.
Re: Icky - Progress
Placed LS06 with pull-ups in U51
Still floppy not found when HDD connected
Re: Icky - Progress
I think I am getting somewhere I think there is still some issues in the layout round the DMA, MFP and WD1772.
On STF remake schematic U32B pin 5 is marked as going to INTR but on the board this actually goes to a pull-up RP1 only.
Checking the STFM original schematic U32B pin 5 should go to pin 28 the INT on the WD1772 and on the STF Remake its marked as INTRQ
However pin 28 on the WD1772 on the STF remake is not connected to any INT but is connected to one of planes.
I did a patch by lifting pin 28 on WD1772 and lifting pin 5 on U32 and soldering wire between them.
Floppy drive still works but when HDD is connected there is just a white screen
Still going round the circuit for other problems that might be there
On STF remake schematic U32B pin 5 is marked as going to INTR but on the board this actually goes to a pull-up RP1 only.
- Screen Shot 2018-10-10 at 00.44.45.png (43.18 KiB) Viewed 3942 times
- Screen Shot 2018-10-10 at 00.40.31.png (229.86 KiB) Viewed 3942 times
Checking the STFM original schematic U32B pin 5 should go to pin 28 the INT on the WD1772 and on the STF Remake its marked as INTRQ
However pin 28 on the WD1772 on the STF remake is not connected to any INT but is connected to one of planes.
- Screen Shot 2018-10-10 at 00.45.39.png (20.97 KiB) Viewed 3942 times
- Screen Shot 2018-10-10 at 00.41.51.png (77.86 KiB) Viewed 3942 times
I did a patch by lifting pin 28 on WD1772 and lifting pin 5 on U32 and soldering wire between them.
Floppy drive still works but when HDD is connected there is just a white screen
Still going round the circuit for other problems that might be there