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Not for me, but I have the board. I never used it but if some one is interested in it, just let me know by PM.

How many eproms do you need?

I even have a simple 27128 eprom programmer for the BBC (user port iirc). But you didn’t ask for that...

I do agree that you can practise smd soldering IF you can see what you are doing and you have the right equipment. On the other side I can also understand that there are members here that even have trouble with soldering normal through-hole components but still want to buy a new board. I sometimes g...

Good news: I have ordered the first ten boards at PCBway, now let's hope they work

After all, they charge only $30 for assembling those 10 boards, which is $3 per board. I cannot do that myself for that price.
The price will be lower than Allpcb, however I have to wait what the taxes will be.

I have never tried a W65C02S6TPG-14 on a Yarrb board or an Atom2k15. I copied the jumpers and resistors from another RAM/ROM board. When I have to order some new components I will order such a CPU and test it, to see if I can get it working. But like you said, it is probably not worth the trouble be...

I asked for a quotation at PCBway. Naturally they have other specifications for the BOM and CPL files :? So I might reconstruct them again. Luckily there are only 41 SMD components on the board :lol: The speed of the board will be limited by the 6502, 6522 and 8255. So probably it will run at 1 or 2...

Today I got my quotation for the Yarrb2 board and assembling the SMD components. Without the LED's (those are out of stock), the price is about €420,00 including VAT and import taxes for ten boards. And then you still have not all components (e.g. the EEPROM, voltage regulator and headers) so the co...

I don't exactly remember the date but is was in the first week of November 1983 that I bought my first computer: an Acorn Atom with a little extra RAM. The price was hfl 239.00 (about €108.00) and after that I invested many more guilders and euros in it :lol: I had worked five weeks during my summer...

One of you might also have such a tape recorder for the Electron or Beeb .... if so, can somebody post the diagram of the cable?

Do you want one with our without a Plus-1? I'll ask around on our monthly Atom User Group meeting tomorrow.

Another supplier like "Allpcb" is not an option ? Yes, see my post at Tue Oct 29, 2019 10:31 pm :mrgreen: It's actually surprisingly easy with some practice. I've soldered a couple of hundred 0.5mm QFP and TSOP parts in this past year without ever terminally messing one up, despite bad eyesight and...

I was playing with the calculator at PCBGOGO.com. Assembling 5 - 15 of these boards costs only $50. Adding 5 more raises the costs to $145 :shock: It looks like it's much cheaper to order 2 x 10 boards than 1 x 20 boards. Parts not included. The calculator at allpcb.com looks very similar to the one...

I got an answer from JLC: Actually that depends on the demand for this part XC95144XL is high or low . If it's high demand,then I believe we will purchase this part soon. If low demand,I think there won't be purchasing plan recently. So actually, you can never be sure if any non-standard component i...

A new storage for mi bits and bytes....

Edit: I hate it when the picture is rotated.....

This could be a realistic approach but I have to investigate the total height of a Yarrb (which is already a daughterboard on the Atom's main board) and then another CPLD board on top of that. On the other hand, creating a small board with 40 - 50 pins and a SMD chip can also be a challenge. I'll ha...

That's really annoying for you.... and not a goot advertisement for those of us considering this service. Indeed. When I picked this part it was plenty on stock. I don't remember how much but it seemed more than enough. There was no notice like "Don't use this part because it is discontinued". FYI,...

Lcsc even mentions that this cpld is discontinued. I'll ask them if they will continue the 144 for at least a year or so. If so then I can redesign it for the time being.....

Another option is to use a 72 but then it is not very useful as a stand-alone board.

:evil: :evil: Today I got an email from JLC that there is not much demand for the XC95288XL and that there won't be any supply on short term. So I have to check if my board can be redesigned with an '144 ( probably with the same risk of getting no components ) or find another manufacturer :( I don't...

Pernod wrote: ↑

Sat Oct 26, 2019 8:55 pm

POKE 53281,x (where colour x=0 to 15)

unbelievable that a computer with such a way of changing colours was (and still is) so popular....

My intention is to have a first batch of 10 boards just in case there is something wrong with the design despite all our good care.

I see that the XC95144XL cpld is available again and I hope the 288 will follow soon. JLC will notify me if there are new ones in stock.

#MeToo

I wanted to order the boards yesterday but they have run out of stock for the CPLD so I could not place my order. I will make a short description about the design and ordering process once I have place my order.

duikkie wrote: ↑

Fri Oct 25, 2019 7:26 am

normaly they are bleu ?

Yes, if you buy them from Elektor they are blue but Elektor also publishes the pcb layout so you can make them yourself at home. It worked nice for simple boards. For Yarrb2 it would probably not be possible

duikkie wrote: ↑

Thu Oct 24, 2019 6:27 am

DIY PROJECT from which book ? ( elektor/elektuur?) , pc ??

Elektor normally has an EPS number on the printed circuit board, even if it is home made. So, if there is no such number at the back side of the board then I'd advise to skip the Elektor magazines.

Pin 1 should be at the "edge side" of the printed circuit board and pin 32 should be next to the printer connector. The upper position should be the right one. I don't have exactly the same connector so just double check the pin numbers.

Does it mean I have to bridge the 2 points left to LK6? Or does my system need 8V? Yes, you have to bridge those two points, and you have to do the same with the two points next to LK7. After you made these bridges, USE A 5V POWER SUPPLY . If you do not make the bridges you need an 8V power supply ...

And if the links are fitted, press break a few times and then press CTRL+G , do you hear a short beep? Now that I zoom into one of your pictures it looks like the links are not fitted. I see a small white line next to the LK6 label. You want to fix that in the first place..... Schermafbeelding 2019-...

(Atom2K18 includes a header for the Pi, which amongst other things connects the Pi's serial lines to the Atom2K18's UART) This is not hard wired on the PCB because that would make the serial lines unusable for other experiments and projects. You can see how I did this in the picture below: IMG_3960...

What Linux distribution do I need on the Pi Zero? I installed a normal Raspbian without graphical environment. IMHO you can use any available distro as long as you can enable the serial console. I also wrote a small loading program on the Atom that I will post this evening. I am assuming this is ve...

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