stardot.org.uk

I'd have thought the double sided tape would be too heavy! The weight of the original 'foam' piece was Very Light . . .

Dave H

Is the PSU inside the main case (sorry don't have an Electron)? If so, drawing more current from the PSU may not be causing problems with voltage sag, just causing the PSU to generate more heat and contribute to the inside the case temperature. Yes, the PSU is inside the Electrons case with the AC ...

More . . . . Dave H

Whilst looking for my Original AP5 (stored away safely :roll: ) I found the following: If you're interested in an item, please PM me referring to the item number, thanks . . . IMG_2695.jpg IMG_2696.jpg IMG_2697.jpg IMG_2698.jpg IMG_2699.jpg IMG_2700.jpg IMG_2701.jpg IMG_2703.jpg IMG_2704.jpg More . ...

DaveB (Hoglet) has found an Error with the AP5 design! See this thread. So far it doesn't look as if it's very serious - e.g. Just remove it for now, if you experience any issues with the 1MHz Bus operation (none reported, so far!) or any issues with > See above link. Any updates on this issue will ...

Found it . . . There's a 1K pull down connected to pin 12 of the Tube connector - Data 0. With nothing connected to Data 0 on the 1MHz Bus connector. Ooooops! It seems as if this may just need to be removed. I'll post this error in the AP5 thread and keep everyone up-to-date on any further issues wi...

OK, Can't find my original AP5 (I've put it somewhere safe :lol: ), however, here's a photo showing a resistor near to the Tube connector - I don't see any reason, other than the pull down in question, why that should be there! So, probably right about it being in the wrong place - - - I'll keep on ...

So, what's the purpose of R7??? It seems it was copied over from the original AP5 reverse engineered schematics (R1 there). It actually makes more sense for this to be on the Tube than the 1MHz bus. On the Tube it would ensure the Co Pro detection worked correctly. Dave, is any chance this is a sma...

I'm still enjoying the building side . . . . But probably aren't making as many as Chris!

Dave H

Sorry, Martin . . . I've been over to Manchester laying laminate flooring in my eldest daughters new extension <sigh>

I need to go back, some time soon, to change a radiator in my youngest daughters utility room <bigger sigh> lol

I'll get something sent this weekend.

Dave H

@Duncan . . . Everything should be well buffered, in respect of the Data lines etc. Which would only leave the power supply! I've carried out lots of tests, recently and BITD, however, there's still a chance you could have a faulty unit. Could you monitor the +5V line at the PSU connector to the mai...

Welcome to the Forum, Mike . . . Enjoy . . .

You need an Electron . . . But I'm biased

Dave H

Welcome to the Forum, Zuffle . . . Enjoy . . .

Looking forward to some interesting Music

Dave H

Welcome to the Forum, Soruk . . . Enjoy . . .

Dave H

Hmmmm! Wonder where that went? . . . Did I use your 'other' eMail address in error? I'll check now - small pause - Darn, can't find hide nor hair of it - plays theme tune from some spooky film - OK I'll send it again (well, I'll try!

Dave H

MartinB wrote: ↑

Fri Jul 13, 2018 9:15 pm

Did you do anything with the naughty one yet Dave? Is it still heading my way?

Did you receive the dodgy video? I was waiting in case there were any further tests I could do before sending!

Dave H

New MGC's are now ready . . .

Dave H

hicks wrote: ↑

Thu Jul 12, 2018 3:18 pm

When you have a board sorted even if there's no FPGA code working on it yet, let me know. I'm quite interested in doing a port myself too as a fun project.

Will do . . .

Here's an image of all I currently have and a DXF of the same: Dave H

May be worth getting some freezer spray and seeing which IC is causing the problem - it sounds as if it is an overheating issue . . . Dave H :D I have some deep freeze (and deep heat) for spraying on injuries. Or some spray for freezing pipes. is there a particualar brand anyone recommends? Hmmmm! ...

As a matter of interest Do the cables you supply connect to user port 2 Idc or the pin header? I'm supplying the USB to Serial leads, the one recommended by MartinB, along with a 9 pin 'D' to 7 pin connector for the header pins - I epoxy a 4 and 3 way together and 'mark' pin 1. IMG_2632.jpg Dave H :D

May be worth getting some freezer spray and seeing which IC is causing the problem - it sounds as if it is an overheating issue . . .

Dave H

I could send you the DXF of the 'spreader' interface PCB, if that would help? Couldn't harm to look :) I'll dig it out . . . Current design replaces the ULA socket with standard turned-pin sockets. Do you have a link to the socket you're using for that? Similar to these. Whilst I think on, are you ...

For anyone else listening-in: I can supply the correct AP5-to-USB cables - just contact me . . .

Dave H

Elminster wrote: ↑

Thu Jul 05, 2018 3:09 pm

Is there any slogger plus 2 bareboards still hanging about, and would they work with an AP5. I would imagine a 'cut' down version of that that only had the extra cartiridges slot would be useful.

Not sure, none here . . .

Dave H

Not the MRB, pulled it this evening, was a pain as don’t know where I put the MOS, stole it from another Electron, and as they are both issue 4’s I took its ULA as well. (For my overheating issue, not put that in yet in case removing MRB fixes that). That's good, at least we're down to a basic mach...

Just posting this from a PM i've just sent:

"It may not be needed (the MRB, for the mouse to work), however, I'm seeing a Power-On anomaly when I'm using BeebSCSI 'sometimes' with a MRB fitted. Maybe worth a try (removing the MRB)?"

Dave H

OK, just caught up . . . Due to me not having most of what is needed, I think the best plan here is to look at the problem at Cambridge. I'll have at least one elk system - Hmmm! Better bring a spare - so we can change things out to eliminate the obvious. DaveB (hoglet) carried out extensive testing...

1024MAK wrote: ↑

Wed Jul 04, 2018 1:44 pm

No selection of partly corroded and covered in who knows what ½ pence coins?

Being a Yorkshireman I'm proud to still have a fluff covered farthing in my pocket

Dave H

My AP5 never worked, but I never told Dave (shhh). Well darn-you Duncan :lol: You should have let me know . . . I do test every interface before shipping - OK . . . I don't test the I 2 C or UPURS interfaces, but, as Martin points out they're just passive to the User Ports which are tested. I could...

Just thought of some thing else. Will the original MOS go back after MRB removed? Assume not. Was on my todo list to build a Prine MRB ROM image that incorporated the *TAPE changes for gosdc. Not a feature everyone will want but be good if that image was available to use. Oh! You didn't really need...