stardot.org.uk

Thanks for the suggestions! (keep them coming please)

To be clear: all credit goes to SimonM who created the tools/scripts to convert BBC tunes to the Elk, not me!

SimonM has been doing an amazing job in converting the Bad Apple chiptune (by Inverse Phase) to the Acorn Electron, for use in my version of this well known demo. As you know not many great tunes exist on the Electron. Until now that is! :?: What are (in your humble opinion) the very best Beeb tunes...

Very nice!

Thanks Dave. It's my own code that this is happening with. But not very often and I can't reproduce the Bad sum error even on consecutive runs of my program. Will have to investigate further. I thought maybe there could be other causes triggering this error.

Sometimes I get the Bad sum error on MMFS 1.41. Not every time and not always at the same place. What are the main causes of this? Using Ramtop hardware on Electron btw

May I just add that I'm enjoying reading about your enthusiastic journey towards getting better at programming our beloved computers. It's giving me great joy as well

You're on a roll!

Interesting information, thank you!

Based on that, it looks like I did enable interrupts in OSWORD 7F in MMFS 1.37: https://github.com/hoglet67/MMFS/commit/1442abe4de8a7798bc81da397be5b2b93df84d13 Do you have a view as to whether it is right or wrong to do this? Well, I don't have a strong opinion either way but it certainly took me ...

My interrupt handler wasn't saving the Y register, only A and X because I didn't use Y in a previous version of the code :oops: Apparently DFS didn't care about that but MMFS does. I have a follow up question for you though: does MMFS enable interrupts (CLI) regardless of the fact that they were dis...

Just to add: my problems with MMFS are solved. My code is now running on DFS as well as on MMFS. Turns out that I made a small mistake in my interrupt driven screen drawing code that wasn't giving any problems on DFS but messed things up on MMFS. Solved!

Good news: I have been staring at this problem for days but this evening I found that my interrupt driven screen drawing routine was faulty. It didn't give a problem on DFS but it created a mess when run on MMFS. Consider it SOLVED but I'm pretty sure I am going to need testers again in the future :...

More details and a first test disk. Assumption: DFS test is working in 3 Acorn Electron emulators. It should work on real DFS hardware AND it should work on MMFS hardware. Reality: I have no real DFS hardware to test on. And my tests fail on 3 different MMFS systems (all EPP based though). Test: loa...

That's great Dave! I will post some details and a test disk. Anybody else willing to test as well can just do that of course

I need some help from anyone willing to run a few test programs on an Acorn Electron with any DFS and/or MMFS hardware. I've got some simple sector loading tests working on DFS in all Electron emulators. And I've been testing on a few MMFS hardware solutions that keep failing these simple tests. I h...

BeebAsm definitely supports a list of comma-separated values after equb/equw/equd/equs. The values can be decimal, hexadecimal, binary, characters and strings. Edit: and variables, labels, macros, etc.

I have tested on 2 products by Ramtop. The ElkSD64 connected to the Elk expansion port. And the ElkSD-Plus1 which plugs into a cartridge slot of the Plus 1.

What is the expected speed of MMFS on such a setup?

I wrote about it on Twitter not long ago:

The loader (REPTON0) of the Electron version is deliberately littered with undocumented NOPs it seems. It doesn't fool my debugger Execution starts at &2BDF after an initial sneaky BRKV redirection.

I'm trying some test code doing raw sector reads (OSWORD &7F) on my Acorn Electron on DFS (in an emulator, btw) and on MMFS 1.4x (on a real Electron). My first question: I know MMFS is based on DFS but the underlying medium (SD-card) is much faster. Is MMFS artificially kept at the same speed as DFS...

This is excellent work! =D> =D> =D> I love that you fixed the Repton "trail" while scrolling! The cheats work well though I can't figure out what I can move around (option E). It seems you also removed the 'protection' code in the loader that uses undocumented opcodes, correct? Keep up the good work...

Well said. Couldn't agree more. I got all 3 most recent versions of the ElkSD from ramtop and they are excellent products!

CJS wrote: ↑

Sat Nov 09, 2019 11:22 am

So many things to try and no longer teenager levels of pocket money to keep my aspirations under control.

I know the problem well

Guess what just arrived this afternoon

Steve1234 wrote: ↑

Fri Nov 08, 2019 1:25 pm

I have a Plus 1 and Plus 3 connected to my Electron and have just bought Ramtops excellent Plus 1 SD card interface that has sideways RAM.

Can't wait for mine to arrive!

This may help?

viewtopic.php?f=3&t=17720&p=245873#p246366

So, we meet again

I've watched a few, good job!
Couldn't you find another 15 great games to make a top 100?

Excellent!!

Great news!!
I like the extra SWRAM available now.
I'm hoping to buy one from you with a case.
Sending you a DM now.

Great work!