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Glad it wasn't either of my boards, but at least you found the problem. Phill . . . I'm currently looking at an issue involving the MRB - I need to check if it's your MRB, a generic problem with MRBs or nothing at all to do with MRBs. I'll start a new thread, when I have more information. Do you ha...

Glad it wasn't either of my boards, but at least you found the problem.

Cheers.

Phill.

If you are going to source parts like this, it may well be worth letting your 'customers' know that they are recycled parts, just incase there are any problems with them. Personally I'll only supply new parts but that's just me. As for surface mount parts dying the only examples I've seen personally...

I found the "MX Cube" software from the ST website was a help to getting started quickly. It will emit a makefile project with initialisation for the IO etc. using the STM HAL (hardware abstraction layer). Once familiar with the devices you can choose to use the HAL or not as suits. For a compiler ...

- Does the screen scroll or wrap in any way when text is off bottom of screen? Currently it's lost off-screen and have to CLS or change MODE to get cursor back on-screen. Bearing in mind that these results could partly be down to my monitor not being able to display the full screen. In modes 0..6 t...

I had a play last night and couldn't get it to display anything :( I'm using a standard Beeb SCART lead which worked** on the Standard video card, I did put a scope on the connector and I am getting a sync signal just no activity on the video (or it's all black!). I'll try having a read of the manu...

The HiRes board is now mostly functional. A few more questions on it's behaviour: - When selected with *GDP (no mode) what is it's initial output before selecting a mode. I currently have a flashing white screen. This will clarify whether EF9366 video RAM is initially 0x00 or 0xff. - Does the scree...

Thanks guys.

I've ordered one of the cheap boards off ebay, that comes with the ST link, but also one of the nucleo boards from Rapid, as in the past I've found having an official dev board can help when you start out....

No promises but DragonUSB anyone

Cheers.

Phill.

What on Earth are you doing to them? I don't think I've ever seen a mouse outright break, even the grotty cheap ones. In my previous job at a local technical college, we used to have a fairly high attrition rate on mice, as they where cheap so we bought them 30 odd at a time. I used to collect all ...

Could I request some more info... - photos of the HiRes graphics board, specifically the crystal (probably 1.750MHz) Crystal appears to be 14MHz, I suspect IC2, IC3 and IC8 divide it down, will measure what is on the CK pin of the video chip later. - photo of HiRes board output. Use *GDP at BASIC p...

Hi all, I seem to remember chatting with someone at the recent ABUG about using the ST ARM micros in beeb related projects. I'd like to have a look into this, what would people recommend for having a tinker. Not (too) worried about being supported by a perticular framework such as arduino, as with m...

Thanks for this, not decoded one of these before so is an interesting task. So far I've confirmed that CPU addresses 0x0000-0x7fff always select the RAM in M1 as suspected, regardless of paging register. Region 0x8000-0xbfff is dependant on paging register, 0 selects M4, 1 selects M3, 2 selects M2,...

Just thrown the PROM code into my verilog PROM emulator and it spits out the following equations they may be of assistance.... CHOS <= '1'; M1 <= A(15); M2 <= NOT ((A(15) AND NOT A(14) AND L1 AND NOT L0)); M3 <= NOT ((A(15) AND NOT A(14) AND NOT L1 AND L0)); M4 <= NOT ((A(15) AND NOT A(14) AND NOT L...

Hi Nigel,

I'll look into your other questions later today, but for now I just uploaded a dump of the PROM here :

viewtopic.php?f=32&t=15216#p205360

Cheers.

Phill.

Hi all,

Here's a dump of the CMS 6502 board's decoder PROM. This was dumped by making an adapter from the PROM to a 2716 and then dumping, and discarding the repeated data (as the 2716 is 2Kx8 and the PROM is 512x8).
Cheers.

Phill.

Here's a rom dumped from an Atom at the ABUG south last weekend.

Not sure what it is, it was labeled "splicer" and seems to be in basic, there was a card with it that said something like ?18=#A0 then run.
Cheers

Phill.

Also the 44 pin VQFP XC95xxXL CPLDs are not that difficult to solder, and would have the advantage that the existing CPLD code could be re-used.

Cheers.

Phill.

I should hopefully be able to make this one too.

Cheers.

Phill.

Have a good one guys hope we can link up withethe ABUG meetup at some point during the day.

Cheers

Phill.

I seem to remember we have had at previous meetups at some point or other : Dragon : 6809, Apple II : 6502 Einstein : Z80 Sirius : 8086 UK101 : 6502 Olivetti PC : 8086 I also remember seeing a couple of Spectrums / C64s along the way not so much being used as being diagnosed / worked on. I will also...

As we still have places available, I just mentioned the ABUG meetup in the Dragon FB group, as a lot of them seem to also be into beebs as well......

Hope this was ok to do.....

Cheers.

Phill.

Right sat and did some tests yesterday. Slot 3: no banks found, all banks just dump repeating $00..$FF which I suspect is just the bus floating. Slot 2:GDP ROM found in all banks (as it's a 27128, I suspect the bank setting write is being ignored). Slot 1:same as bank 3 Slot 0:I think when I dumped ...

I've bought some 0.47uf X2s, and have 0.1uf for doing beebs, just gotta remember to bring them......

Cheers.

Phill.

Right, lets try this again shall we !

6502 user guide : http://penguin.stats.warwick.ac.uk/~sts ... -guide.pdf
Multi-basic user guide : http://penguin.stats.warwick.ac.uk/~sts ... -guide.pdf

Cheers.

Phill.

On the 40/80 card there are a number of links to configure the serial interface. Can you let me know how they are set, and also whether the 6522 IRQ line is linked? serial_links.JPG Edit: The keyboard seems to work without any of these links made. Can you also confirm whether the machine starts in ...

jgharston wrote:Seems to only have odd-numbered pages.

Bollocks!

I'll take it in again tomorrow, and try again!

Cheers.

Phill.

Hi all, Here's the scans from the big ring-bound manuals, I was able to scan this direct to pdf as the printers at work have cut sheet double sided scanners :) Still scanned at 600dpi so reasonable quality and perfectly readable. I've uploaded them here : http://penguin.stats.warwick.ac.uk/~stsxab/C...

Going back to your READER2, could you do some additional tests with it? You've set your socket S% to 4 (same as 0?), this is stored at slot register &FC70. Could you run for S%=0, 1, 2, 3 to see where GDP is found. I suspect S%=0 will be the same as S%=4. You also set X%=B%+&80, the MOS performs AN...

Pernod wrote:Tweaking the EF9345 shows signs of life, the machine is actually running but needs further video work.
0001.png

That's deffo beginning to look like what I get on the real hardware, well done.

Cheers.

Phill.

This is from one of the not yet scanned manuals, thought it might help...... Address range Use $FA00-$FBFF Advanced graphics card $FC00-$FC0F CPU card VIA $FC10-$FC1F GDP card control register $FC20-$FC2F GDP card colour register $FC30-$FC3F RTC registers $FC40-$FC4F Disk controller registers (1770?...