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Like Kees said, check the capacitors. I have often had Atoms with flaky video and replacing C4 solved the issue. And often you can also get a better display by removing L1 and replace it by a short piece of wire.

The Electron Econet interface uses ROM 13 and if I remember correctly the AP5 and AP6 also provide a socket for ROM 13. Please correct me if I am wrong.

The Atom Basic has labels for GOTO and GOSUB, albeit a single letter :mrgreen: 10 GOSUB c 20 PRINT "TEXT ON AN EMPTY SCREEN"' 30 END 40 50cPRINT $12 60 RETURN This is quite fast because the address of the label is stored at a fixed position in the Basic workspace memory. So the interpreter...

For the Atom we have a way to generate a short delay by checking the vertical sync; it's the routine at #FE66 and it's used by the WAIT statement. Now I need a similar routine for a System-5 computer. Is there a way to check the VSynch of the 6845? I haven't found it in the datasheet how to check th...

The Atom Basic interpreter starts searching for a statement in the Basic ROM at #Cxxx and MOS ROM at #Fxxx. If the statement is not found then the Basic looks if there's a Floating Point extension installed at #Dxxx. If so, it hands over the control to the search routine in the Floating Point ROM. I...

There is no such guide. The Atom does not have any standard structure like the Beeb and Electron. There are no language ROMs or service ROMs. There are three common ways of initiating a ROM: 1. By generating an IRQ on reset, like the Econet and AtoMMC do 2. By linking to an address, the Program Powe...

Isn't it time for an update of the Archive? There are several newer games released and the AGD carousel might also be updated. The latest "official" release is dated November 2011 and the latest V12.4 pre release is also a year old. Just asking ...

I'm curious if we have more lovely Atom related artwork. T-shirts perhaps? :D Yes there is: acorn-atom-t-shirt-300x300.png It was created on my request by Apparel of Laughs. You can buy them at https://appareloflaughs.co.uk/product/acorn-atom-mens-t-shirt/. They also have Electron and Beeb shirts.

I never use the boot loader, I just program the complete firmware into the PIC. Here's a link to the firmware that I use in my AtoMMC boards: https://site.acornatom.nl/download/mmc4 ... rmware.bin

Does this get you getting started with your respun version?

We have a discount code from Fletcher that is valid for reservations at 4 and 5 October, during the ABUG weekend. When you make your reservation at the hotel on their website (https://www.hotelveldenbos.nl/) you can get a 5% discount if you become a Fletcher Friend plus you can get an extra 5% with ...

I agree, it's beautful

Welcome to this forum. I’d really advise to get an AtoMMC and a memory expansion for your Atom. That’s the easiest and most comfortable way to use the Atom Software Archive. Enjoy your Atom and your visits here, Greetings from the south of the Netherlands, Roland PS … can one of the admins move this...

Now that I've read that topic I don't think that the BeebWiFi is ever going to work without cutting tracks and adding bodge wires on either the BeebWiFi board, the Mertec board or even in the Master Compact. So it's just a no-go with this setup.

No, I don't have an Electron that hasn't anything plugged into it. I'm interested in a Plus-1 and I PM'ed you about it.

BigEd wrote: ↑Sun Feb 25, 2024 8:28 am It's not even always true that faster is better.

That’s true. For example, 70ns 62256 RAMs do not work in my Atom’s Yarrb boards where (even Chinese) 100ns RAMs work fine.

Can you please post some photos of the bevelled connectors? I have used similar Chinese connectors for minus1 boards and I didn’t notice any damage.

Thanks for this information. It's clear to me that I must read the 1MHz bus topic and see what I have to do to access the paged RAM and UART

Thanks, that's useful info.

I'll read the topic you refer to. But just to answer a first question: what can it be at page &FD when the Mertic is not connected. Should it behave like a BBC B, like this:

Tonny is connecting his BeebWiFi board to a Mertec but he gets the message "No paged RAM". It turns out that there is "something" at page &FD. WhatsApp Image 2024-02-22 at 14.30.20.jpeg With a simple check for RAM we notice that there is no RAM at that page. Also with the Mer...

You can also have it send to me in the Netherlands, within the EU there are no import taxes and I am happy to forward it to you.

Today I got MODE 7 operational \:D/ I got another SAA5050 from the owner, and he was quite sure this one definitively works. But alas, no such luck. This is the third one that doesn't work in this Beeb and I can believe that one is damaged, the second is defect (and from an unknown source) but three...

Not only the holes are very rare, the issue 1 is extremely rare. I’ve never seen a complete Atom issue 1 before. In September 2019, Alex van Someren showed us his blanc issue 1 board at the Abug meeting in Cambridge. I wonder what the differences are between the issues. I can guess the difference be...

hoglet wrote: ↑Mon Feb 12, 2024 10:32 pm If the 6845 INT is high (inactive), then one of those must be at fault, or some other signal is shorted.

I think this is a typo… it’s the 6854 INT. I mention this just to make it clear

I use an XGecu TL866II Plus programmer in Linux. The software runs fine with wine. Even firmware updates run without problems. It's also possible to run the software in a virtualized Windows (XP) system in VirtualBox.

Yesterday evening I had a great break-through with this Beeb ... it's almost working \:D/ I did check the R85 3k3 resistor (which is all right) but I discovered that the IRQ level was about 1V. And that's wrong. I learned that the Godil might read the wrong values from the databus when a device like...

Pictures will give us an impression of your current Atom configuration. First step: is the 5V ok?

BTW if a key is stuck you can easily check it out by pressing the REPT key.

I will try it when I can sneak out of my office during the day

Note to myself: I was wondering why &DCA9 and not &DCA2 but now I realize that &DCA2 is just the check for the ACIA interrupt and &DCA9 is servicing the interrupt.

There is an unknown interrupt source. I get many, many hits at DCF3. So I removed almost all devices that can generate an interrupt: User VIA, ACIA (6850), Serial ULA and the ADC. Without the ACIA I get only interrupts from the ACIA. I mean, &DC2A &DCA2 is hit now, but I think this is the hi...

Here it is.....