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by stephen_usher
Sun Oct 18, 2020 9:49 am
Forum: TF536 ST EDITION
Topic: TF536 + 68000 relocator and ROM board project.
Replies: 154
Views: 3083

Re: TF536 + 68000 relocator and ROM board project.

Well, Freerouting had got through about half the optimisation process, pass 37, with the number of vias down to 81 after 8 hours when I went to bed last night. I'd hoped it would have completed by this morning but instead I found that it had crashed. Of course it doesn't do any checkpointing (*sigh*...
by stephen_usher
Sun Oct 18, 2020 8:55 am
Forum: MEMBER BLOGS
Topic: exxos blog - random goings on
Replies: 1087
Views: 128823

Re: exxos blog - random goings on

There's the IDE interface on that side. I did look at all possible locations and orientations, again and again.
by stephen_usher
Sat Oct 17, 2020 10:07 pm
Forum: MEMBER BLOGS
Topic: exxos blog - random goings on
Replies: 1087
Views: 128823

Re: exxos blog - random goings on

PhilC wrote:
Sat Oct 17, 2020 6:34 pm
@stephen_usher you could also solder it underneath the TF536.
Not really, as the 68000 is directly below on the new board and once the TF536 installed without a socket (soldered to the board, as it will be eventually) there will be no room underneath.
by stephen_usher
Sat Oct 17, 2020 5:36 pm
Forum: MEMBER BLOGS
Topic: exxos blog - random goings on
Replies: 1087
Views: 128823

Re: exxos blog - random goings on

That's actually very interesting. Would this board be able to be soldered directly onto the TF536 board? If so that would potentially reduce the height of the board by a few mm. In my project to get a TF536 into an STFM and fit the keyboard and top case height is my enemy. From my current state the ...
by stephen_usher
Sat Oct 17, 2020 3:29 pm
Forum: TF536 ST EDITION
Topic: TF536 + 68000 relocator and ROM board project.
Replies: 154
Views: 3083

Re: TF536 + 68000 relocator and ROM board project.

After some Blue Peter style paper cutting I now have the PCB shape sorted and the components laid out.

Now to see if the auto-router (freerouting) can actually get all the traces on!
by stephen_usher
Sat Oct 17, 2020 2:37 pm
Forum: TF536 ST EDITION
Topic: TF536 + 68000 relocator and ROM board project.
Replies: 154
Views: 3083

Re: TF536 + 68000 relocator and ROM board project.

I've started work on a Mk.II board using the lessons from the first one. This is designed to fit around the MMU, which will allow it to sit approximately 3mm lower (flush with the tops of the sockets on the main board). It also adds control of the /HALT line on the two processors, which should reduc...
by stephen_usher
Fri Oct 16, 2020 7:39 pm
Forum: TF536 ST EDITION
Topic: JTAG programming with Raspberry Pi
Replies: 7
Views: 172

JTAG programming with Raspberry Pi

Does anyone know what JTAG comms should look like on an oscilloscope? I'm using xc3sprog with the following command line when logged in as root to see if I have a connection: xc3sprog -c sysfsgpio_creator -j From what I can see I'm getting activity on TMS (normally high, pulses low), TDI (normally h...
by stephen_usher
Fri Oct 16, 2020 1:45 pm
Forum: CHAT FORUM
Topic: Store: I keep getting "basket empty"
Replies: 5
Views: 125

Re: Store: I keep getting "basket empty"

exxos wrote:
Fri Oct 16, 2020 1:00 pm
stephen_usher wrote:
Fri Oct 16, 2020 12:15 pm
I managed to get it to work by clearing out the old(er) cookies created this morning.
Clear basket button deletes the cookie to reset it.
I did try that but it made no difference.

Anyway, "fixed" now. :-)
by stephen_usher
Fri Oct 16, 2020 12:24 pm
Forum: TF536 ST EDITION
Topic: TF536 + 68000 relocator and ROM board project.
Replies: 154
Views: 3083

Re: TF536 + 68000 relocator and ROM board project.

@PhilC You may like to swap those pull-up resistors to 10K ones as that'll reduce the loading on the power rail.

With that changed I can run both CPUs without auxiliary power, just.
by stephen_usher
Fri Oct 16, 2020 12:15 pm
Forum: CHAT FORUM
Topic: Store: I keep getting "basket empty"
Replies: 5
Views: 125

Re: Store: I keep getting "basket empty"

I managed to get it to work by clearing out the old(er) cookies created this morning.

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