Opus Discovery 1

[t0nyt]

Well the only line on the edge connector that has any power, according to my multi-meter, is the 9v line, and that is only 0.5v

Not sure what's going on though because when I check voltage at the FDD cable (where it meets the motherboard) I get no volts on my meter but the FDD powers up seemingly ok (both lights & mechanically)

It seems like the multi-meter is the problem, but it works when tested with batteries or walwarts

[tofro]

Well the only line on the edge connector that has any power, according to my multi-meter, is the 9v line, and that is only 0.5v

Not sure what's going on though because when I check voltage at the FDD cable (where it meets the motherboard) I get no volts on my meter but the FDD powers up seemingly ok (both lights & mechanically)

It seems like the multi-meter is the problem, but it works when tested with batteries or walwarts

You'll likely have not found a proper GND or have set the MM to AC voltage.

[t0nyt]

Well the only line on the edge connector that has any power, according to my multi-meter, is the 9v line, and that is only 0.5v

Not sure what's going on though because when I check voltage at the FDD cable (where it meets the motherboard) I get no volts on my meter but the FDD powers up seemingly ok (both lights & mechanically)

It seems like the multi-meter is the problem, but it works when tested with batteries or walwarts

You'll likely have not found a proper GND or have set the MM to AC voltage.

Thanks, definitely on DC voltage

Have tried multiple grounds, the ones on the edge connector and on the mobo at both floppy power connectors

Will search around for more grounds, maybe I can find a ground pin on one of the ICs

[t0nyt]

Well this is insane

I poked around a bit to try and find some voltage (using 6116 ground) and suddenly it all popped into life

The Speccy now works with the Opus attached and I get the start screen with the opus arrow thingy

My only concern at the moment, other than it stopping working again for no reason, is the the 9v line shows as 14v on my multi-meter (the 9v walwart I use normally for it shows as 12v on my meter though)

Any thoughts please?

Many thanks

[tofro]

Well this is insane

I poked around a bit to try and find some voltage (using 6116 ground) and suddenly it all popped into life

The Speccy now works with the Opus attached and I get the start screen with the opus arrow thingy

My only concern at the moment, other than it stopping working again for no reason, is the the 9v line shows as 14v on my multi-meter (the 9v walwart I use normally for it shows as 12v on my meter though)

Any thoughts please?

Many thanks

Are the 14V under load (i.e. with the Spectrum connected and running) or open circuit? For the latter, it would be OK, for the former, it would create unnecessary heat in the Spectrum. (While most 7805 that are fed with this voltage are specified for 25V Vin max., closer to 9V is a lot better for the thermal sanity of your Spectrum)

[t0nyt]

Well this is insane

I poked around a bit to try and find some voltage (using 6116 ground) and suddenly it all popped into life

The Speccy now works with the Opus attached and I get the start screen with the opus arrow thingy

My only concern at the moment, other than it stopping working again for no reason, is the the 9v line shows as 14v on my multi-meter (the 9v walwart I use normally for it shows as 12v on my meter though)

Any thoughts please?

Many thanks

Are the 14V under load (i.e. with the Spectrum connected and running) or open circuit? For the latter, it would be OK, for the former, it would create unnecessary heat in the Spectrum. (While most 7805 that are fed with this voltage are specified for 25V Vin max., closer to 9V is a lot better for the thermal sanity of your Spectrum)

Thanks tofro

Open circuit, so sounds ok please?

As it has a 6116 fitted already and I’ve burned & fitted the latest ROM, I guess my next job is to fit the gotek and make the original drive secondary and then see if they work

Many thanks

[XorA]

Well this is insane

I poked around a bit to try and find some voltage (using 6116 ground) and suddenly it all popped into life

The Speccy now works with the Opus attached and I get the start screen with the opus arrow thingy

My only concern at the moment, other than it stopping working again for no reason, is the the 9v line shows as 14v on my multi-meter (the 9v walwart I use normally for it shows as 12v on my meter though)

Any thoughts please?

Many thanks

Are the 14V under load (i.e. with the Spectrum connected and running) or open circuit? For the latter, it would be OK, for the former, it would create unnecessary heat in the Spectrum. (While most 7805 that are fed with this voltage are specified for 25V Vin max., closer to 9V is a lot better for the thermal sanity of your Spectrum)

Thanks tofro

Open circuit, so sounds ok please?

As it has a 6116 fitted already and I’ve burned & fitted the latest ROM, I guess my next job is to fit the gotek and make the original drive secondary and then see if they work

Many thanks

If I remember correctly you will need a tape/tape image to make the boot floppy unless you already have one or an image thereof!

[t0nyt]

Not sure if I have it or not at the moment, but it doesn’t surprise me that I’ll have more challenges ahead!

Many thanks

[tofro]

Are the 14V under load (i.e. with the Spectrum connected and running) or open circuit? For the latter, it would be OK, for the former, it would create unnecessary heat in the Spectrum. (While most 7805 that are fed with this voltage are specified for 25V Vin max., closer to 9V is a lot better for the thermal sanity of your Spectrum)

Thanks tofro

Open circuit, so sounds ok please?

Yep, that's fine, then.

[tofro]

If I remember correctly you will need a tape/tape image to make the boot floppy unless you already have one or an image thereof!

I don't think the Opus needed some sort of boot floppy. All went from ROM, there. That was the +D Disk interface (Miles Gordon Technologies) that needed boot floppies, wasn't it?