stardot.org.uk

Just a small update,

I have a pair of Atom RAMROMs assembled, just need to get the cpld programmed, and board tested, will hopefully do that over the weekend. So hopefully you (and markdryan) should get a pm from me next week.....

Cheers.

Phill.

Following Rolands 2K18 discussion, built his previous model I was wondering if there would be interest in building an Atom on 19" Eurocard boards. New meets old.. using the 6847 (No godil) but a PS/2 keyboard interface. Split over maybe multiple boards, and for the Glue Logic I want to use the EPM3...

Elminster wrote: ↑

Sat Jun 30, 2018 2:34 pm

After all how much happiness from the Side effect of that blue pilled heart mediacine has been achieved!

Possibly TMI but can comfirm this.....helps counter act that perticular side effect of diabetes.

Cheers.

Phill.

Looks good stuff. I need more colours too. For prototyping I now use what I think used to be called Vero-wire. It has a fusible varnish that acts like a flux so that it can be soldered without stripping. Cool. 8) Only have two shades of orange though. :( Do you have a link to that, as I can only fi...

Just a quick reply when I last bought the XC95144XL for the DragonMMC they where about 5.50 in quantities of 50, which is a little cheaper dunno if an Elk ULA would fit tho......

Cheers

Phill.

Building my 2.4 at the moment. SwinSID on order. I already have a working 2.3 with a real SID, but it is in the loft and easier to build a new one that try and find it! I'd be interested to know if you get that going, I tried an erlier incarnation of the SwinSID, but could not get it to work proper...

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.