stardot.org.uk

Linky:
https://github.com/janrinze/16bit-atom

Looks very interesting.

One thing to be aware of with Southern Belle is that if there are additional ROMs in the system, then it doesn't seem to work quite right, because of the additional interrupt service time.

See:
http://www.stardot.org.uk/forums/viewto ... 38#p150938

davidb wrote:My fork of Elkulator has a video recording function. I didn't get round to making Atomulator do the same.

Do you have a link to your fork? I couldn't find it in github.

This video is recorded at 100Hz: https://www.youtube.com/watch?v=ZJSrCT-SfYQ Stats for Nerds in YouTube says: 430x360@14. And one at 200Hz: https://www.youtube.com/watch?v=K9UkCVTG_Vc&feature=youtu.be Stats for Nerds in YouTube says: 430x360@15. Earlier videos were 430x360@10 I think. Not sure ...

Hi Kees,

This is just so cool, I'm almost speechless!

I notice the videos are slightly jerky at times. Is this just an artefact of the video, or is the rendering running out of cycles and skipping frames? Is it any better at 2MHz?

Dave

Doesn't seem to be as much as I had hoped out there. If you are into more serious programs like Conway's Game of Life, BigEd and I wrote a version for the 6502 Co Pro that makes use of the additional banked memory to allow a very large grid: http://www.stardot.org.uk/forums/viewtopic.php?p=153721#p...

Can you recall what the "correct" DC plug was please? I have just picked up an EMP-20 and what looked like a 5.5mmx2.5mm power adapter socket isn't I've just measured mine quite carefully, and I make it a 5.5mm x 2.5mm. In what way doesn't that fit your EMP-20? i.e. is it to tight or too ...

Anyway, is there anything similar for the B that anyone can think of ? As I say I have a very vague recollection of something it may of been a magazine type-in though or a demo included with something else I cannot remember. I wrote something similar back in 1985 which I recently (well... 5 years a...

Here's some more data: IMG_1307.JPG The scope is consistently triggering on the access to #B002, and is in infinite persistence mode, capturing data over about an hour. The top trace is Phi2, the bottom trace is D7 being driven by the 8255. Some of these levels are definitely not very digital! Dave

@Dave /hoglet, if reading, can you put the link in the MMFS support opening thread, as took a while to find! Done. also, when using the program, may be could add a question from DFS>MMC program for 40 or 80 Track, or just press Escape at T41 :) I've created an issue for this, for when I next do som...

Just a speculation, without any investigation of the datasheets: can it be caused by #B002 changing during the execution of the ADC #B002 instruction? :D getting warmer I think... According to the data sheet, the 8255 latches VSYNC (Port C bit 7) on the rising edge of Phi2 and the 6502 then reads i...

John,

Acornsoft Temperature Control Simulation (SBE16) was archived by Wim here:
http://www.stardot.org.uk/forums/viewto ... 33#p128933

Dave

I've tried the above test on a New 2015 Atom and I can make that fail as well. But so far I have only seen a failure with a NMOS 6502 (specifically a 1MHz SY6502) CPU, not (yet) with the 2MHZ CMOS R65C02. Any more speculation as to what might be going on here? For any non-atom people, #B002 bit 7 is...

I didn't run the routine yet, but is there any difference on what type of real Atom you run this? Original, Atom2k15, fpga Atom? I have only tried in on my original Atom. I would be very interested to see if only my Atom has this "issue". I can also try it on a New 2015 Atom. The Atom is ...

They form a Class B amplifier stage, to allow the audio to drive a low-impedance loud speaker.

Hi all, I've got a little challenge for you all to try to figure out. Here's a short Atom machine code program. 10 DIM LL10 20 P=#2800 30[ 40:LL0 50 LDA @#80 60 CLC 70 ADC #B002 80 BCS LL0 90 BMI LL0 100 RTS 110] 120 LINK #2800 130 P.$7 140 END Here's the assembly listing so you can verify the actua...

My fork is really old now.

The NuLA changes were merged back into the stardot/b-em repository master branch back in November, so any build since then should include it:
https://github.com/stardot/b-em/releases

Dave

Col, I bought an 858D off eBay at Christmas and I would not recommend it . It works fine (so far), but I opened it up after hearing some horror stories concerning safety. Many of the metal case parts were not earthed adequately. So I spent a couple of hours adding lots of additional earthing before ...

DaveH had a cool old desolderer that done a pin at a time with sucker build in (with wool filter). Anybody know if they are still sold & name of it?? This would save me 1/4 of time and less broke chips! Was it this sort of thing? (A Duratool D00672) http://cpc.farnell.com/duratool/d00672/desold...

Hi Kees, Again, some very nice work here. I'd like to try to build the "Foggy" demo (again as a good test of the profiler I'm working on). Are the files for this checked into your github? Also, I've spotted a bug in the script compiler that causes a core dump on Linux. In main() you have: ...

Do you think it is worth adding support for reading the label files that can be output from beebasm (and SWIFT I think)? I added it for my local version of beebem and it is quite useful, where an address isn't an exact match, I just use the nearest label with an offset. e.g. .draw_text+3 beebasm do...

The call level profiler now groups by call path. Here's an example: $ decode6502 --profile=call --quiet --byte atic1.bin warning: call stack underflowed, re-initialize call graph warning: call stack underflowed, re-initialize call graph 5343 ( 0.118923%): 1394477 ( 31.037838%): 064D 18923 ( 0.421182...

Updated disassemblies of all five versions (using the improved BeebDis 0.91): pp_toolbox_v2.zip The complete list of changes between 660E and 0D78 is: - LINK #AF00 now directly sets the BRK vector (rather than only via OSRDCH) so the toolkit can be initialised in a program - the VECTOR command no lo...

(made using Phill's BeebDis disassembler) Glad to know someone is using it :) Must put it in github actually. Oooh yes, please do. The most time consuming part is dealing with embedded strings. I was wondering about an "auto" string command that could be used to recognise: JSR #F7D1 <stri...

roland wrote:I use the DISAS and STEP ( or TRACE ) statements regularly. They are in several expansion roms.

Which ROM in particular do you use?

Right, I think I can now time order all of these versions, by tracking bug fixes. (For version number I'm using the Atom CRC of the raw 4096 byte ROM file) The earliest version is 1904, the one that John just found. There are two bugs that appear only in this version, and that are fixed in later ver...

I'm still trying to work out whether 0D78 is earlier or later than the other versions, as there are quite a few non-cosmetic differences. I'm starting to think it's later, but has a couple of bytes of corruption (which we can easily fix). I've got disassemblies of 660E and 0D78: pp_toolbox.zip Here'...

So which, if any of these is the version allegedly written and distributed by Jim Baker before Program Power started distributing it? The versions where the area for the copyright message is filled with spaces, do look like copies. But are the spaces replacing the Program Power copyright message or...

The original ROM should be called at #AF00 and should display the (C) PROGRAM POWER string. This means that versions 6C9E and CB06 aren't original. Agreed. The state of @ shouldn't be affected so version 1904 also isn't original. I expect this was a bug, so this is probably an earlier version. Miss...

oss003 wrote:Missing the RESTORE command is also wrong so version 0D78 is also changed.

I was wrong about this, it does actually have the RESTORE command, and it works.

Dave