PCB Build - Progress - Post your Pics here :-)

Post by **Icky** » 15 Sep 2018 21:46

Forgottenmyname wrote: 14 Sep 2018 22:15 Ok so a brief update.

I've plugged the board into my bench power supply, just the two five volt and two 0 volt rails and recorded a current use of 440ma.

None of the components are even warm to touch after being on for 5 mins but no video as yet.

Snap - just done the same. - bench power supply drawing 460ma - components all cool to touch.

Post by **PhilC** » 15 Sep 2018 21:46

Ok, so far:

Reset circuit toggles cpu ok.
_Halt is high, so the cpu is running.
8mhz to you is stable.
16 and 32mhz at shifter seem good to me.
_AS at cpu has a square 1mhz signal and the datalines seem to all have the same 1mhz triangular signal.
MMU seems to be communicating ok with data on the MAD lines.

I'm willing to bet either I've miss soldered something on the rgb circuit or something is missing, as nothing really happening on the monitor plug.

Will dig out my old CRT tv tomorrow and see what that does.

Post by **PhilC** » 15 Sep 2018 21:58

Icky wrote: 15 Sep 2018 21:46
Snap - just done the same. - bench power supply drawing 460ma - components all cool to touch.

Cool, we can't be far off with similar figures.
Did you have no video either Icky?

alienkidmj12 · Post by **alienkidmj12** » 15 Sep 2018 22:04

this all sounds awesome, well done guys, been a bit busy but had a good read tonight :)

Post by **Icky** » 15 Sep 2018 22:26

Forgottenmyname wrote: 15 Sep 2018 21:58 Cool, we can't be far off with similar figures.
Did you have no video either Icky?

Hi - No video yet. The monitor did sense something at one point i.e. no-signal to a flicker, but I'm putting that down to just background noise as I have not seen it since.

Like you I will start looking tomorrow more closely with my scope

Post by **Icky** » 15 Sep 2018 22:31

Forgottenmyname wrote: 15 Sep 2018 21:58 Did you have no video either Icky?

And now I have life but no meaning :)

Not sure what I have here but I have output.

IMG_3044.png

BlankVector · Post by **BlankVector** » 15 Sep 2018 22:46

Exciting progress :D

alienkidmj12 · Post by **alienkidmj12** » 15 Sep 2018 22:55

i can see trees and sunset there, in the distance !! or you could actually say, waves washing up on the shoreline

Post by **exxos** » 16 Sep 2018 00:11

Does the floppy drive get accessed ?

Looks like a sync issue so far.. Even without tos running the video should be stable.. Its worth checking back from the monitor port to glue etc.. Don't assume I've wired the connector up right either ;)

Post by **Icky** » 16 Sep 2018 09:42

exxos wrote: 16 Sep 2018 00:11 Does the floppy drive get accessed ?

Looks like a sync issue so far.. Even without tos running the video should be stable.. Its worth checking back from the monitor port to glue etc.. Don't assume I've wired the connector up right either ;)

I don't have the floppy connected at the moment.

But here is video of first boot. As you can see I get the black screen then it starts to go out of sync.

PCB Build - Progress - Post your Pics here :-)

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