stardot.org.uk

Oh I remembered about the open collector then forgot when I posted. What hoglet wrote! Verilog does have synthisisable for loops but you don't really need that for 8 lines. edit: in case you do though you do it along these lines. code pinched from another forum... integer i; reg [7:0] io_internal; a...

// assign scsi_nACK = ~scsi_ACK; assign scsi_nACK = (~scsi_ACK) ? 1'b0 : 1'bZ; // assign scsi_nSEL = ~scsi_SEL; assign scsi_nSEL = (~scsi_SEL) ? 1'b0 : 1'bZ; // assign scsi_nRST = bbc_nRST; assign scsi_nIRQ = (bbc_nRST) ? 1'b0 : 1'bZ; Does that look right? Not so sure about the databus. I'll come b...

What is the current capability of the CPLD pins? You need 23mA sink (per pin) to drive SCSI-1 with a single terminator I think.

8E is OPENIN in BASIC 2.
ref: BASIC ROM USER GUIDE by Mark Plumbley

Couldn't see the other codes in the list.

My only source aside from the various emulators source was the M5000 schematic posted on stardot a while ago... I don't own a M500 or M5000 to check first hand. Interesting though the snippet billcarr posted - which is presumably what you recall? They must have been talking about the player code I t...

Rob, Ample or the M5000? AFAIK the hardware doesn't produce any interrupts. You'd have to go bare metal for a game or demo...

I've implemented the M5000 on a project... Tell us more. It's the thing I mentioned to you at the last ABUG Tricky, the low cost Cortex M7 1MHz bus board. I made the dev board (12 months ago!) around the time dp11 posted about the Pi 1MHz bus thing. It was one of those dev boards I sent to KF for t...

I've implemented the M5000 on a project and the more I learn about it the more I am saddened that it wasn't really taken advantage of. The tools just weren't there. I'd love to know what musical gems would be out there if it ever got 1/2 the love the mod scene or the Gravis Ultrasound got... A moder...

Rob has posted a comprehensive manual which is enough to reimplement the functionality from. I believe hoglet reimplemented it in a project.

Hi Jason,
Can you please pencil me in for Saturday only no kit too?
Thanks,
Chris

Did anyone have a fork of this, 'tis gone :( https://github.com/puppeh He changed his github handle to itszor. https://github.com/itszor/gcc-6502 I've been using the GCC8 branch & that is quite good. It would be even better if indexing & pointers were handled better - at the moment they produce a l...

julie_m wrote: ↑

Sun Mar 08, 2020 4:24 pm

There is no crunching required, as it's just enough BASIC for the embedded assembler and a variable export dance. Anyway, my code is far too beautiful to spoil in such a fashion!

Until you run out of memory

What are you editing the code on? I do my BASIC work on a PC with lots of comments... then send to a B for testing via the serial port. Last stage is to crunch it before release. Since the original is still on the PC in verbose form it makes editing & refactoring a breeze.

I then re-fitted the new RAM and... Mode 33 worked. So, although the machine was stable and everything worked yesterday other than the mode change it looks like there was a bad connection. Very strange. Now to try the overclock again. Can you repeat the game test before you try the overclock? Do yo...

If it goes wrong on a 4MB A4000 and a 4MB A3010 in the same way but worked on a 2MB(?) A4000 then that would hint at a software bug.

stephen_usher wrote: ↑

Sat Mar 07, 2020 12:12 pm

To make it (FAR) easier to fit them I opened the ZIP memory connectors by poking my oscilloscope probe into the holes, widening the contacts just enough.

Huh... good idea.

Everyone should have their RAM now (or at least on the way for myelin).

I think Ken's work is well within the licenses. Except ironically the method for crediting Simon - including Simon's logo kinda implies endorsement which is banned by the CC license Simon linked.

Keep up the good work Ken.

LordVaderUK wrote: ↑

Mon Mar 02, 2020 1:02 pm

A very exciting package from @marcusjambler...

Spare keyswitches for an Elk! Nice

Memory fitting As per Mark's notes earlier in this thread then getting good access to your motherboard is essential to see what you are doing. 1. LINK31 pin 1-2 2. Remove LINK32 3. Insert modules (be careful) 4. Connect wire from LINK32 pin on module to LINK32 pin2 on the A3020/A4000 When inserting...

RAM fault (bit 1 of the "upper" bank of memory) or a problem with the Teletext chip or connection to it.

Do you get any graphical corruption in a graphics mode? Change to mode 0 - are there missing pixels or spurious pixels?

Welcome!

Yes. There is a sales thread.

If you want to solder the adapter yorself I can throw in the adapter PCB for free. If you want a fully assembled adapter ready to go I can do that too.

Chris

I did this MOS switcher which uses my USB programmable EPROM module. A couple of forum members have them.

Boards are ready for stardot users. I have PM'ed everyone on the list.

There:
Much better! It is nice and easy to remove the RAM now.

They are officially horrible to remove from the ZIP sockets! The sockets really grip the 39 pins - you have to pry between the socket and the pin headers to get them out without damaging the pins. Lots of patience required. I am going to swap the ZIP sockets on the project sponsor's A4000 for turned...

The RAM arrived today. I will build up forum member's orders this week. I'll PM everyone on the list Wed/Thu.

If you are not on the list and want RAM then tell me ASAP.

At the last ABUG I moved the ROM switch input on Tom's Master from the CPU (pin 40) to pin 13 of IC 19. This allows the module to hold the Master in reset under control from the USB serial link. IC14 (CPU) pin 40 would still work but you'd be shorting the output of IC39 pin 1 to ground which isn't t...

RobC wrote: ↑

Tue Feb 18, 2020 6:52 pm

I'll only be bringing one M128 so there should be enough space for three other setups.

I will bring a model B then. I'll aim for 9ish arrival as well.