Search found 75 matches

by jregel
Fri May 18, 2018 10:38 am
Forum: hardware
Topic: Cartridge slots
Replies: 8
Views: 334

Cartridge slots

I’ve been thinking about about the cartridge slots provided on the Electron (with Plus 1) and the Master, specifically in the different ways they have been used. Generally speaking, the cartridge slots on the Master seem to primarily be used for adding sideways RAM/ROM. On the Electron, they are use...
by jregel
Sun Mar 18, 2018 10:40 pm
Forum: programming
Topic: Transferring data across the Tube
Replies: 7
Views: 456

Re: Transferring data across the Tube

Thanks for the comments, Kieran, and for that link which is *very* informative!
by jregel
Sun Mar 18, 2018 10:07 pm
Forum: programming
Topic: Transferring data across the Tube
Replies: 7
Views: 456

Transferring data across the Tube

Just curious if anyone knows how much data can be transferred from a parasite second processor to the host processor (bandwidth per second), and what the pros/cons of the different methods are? I've read on the SpectROM thread that this can be done using bespoke OSWORD routines, extending the VDU pr...
by jregel
Thu Feb 15, 2018 10:22 pm
Forum: hardware
Topic: Music 5000 - sound generation
Replies: 12
Views: 566

Re: Music 5000 - sound generation

Thanks - so it's an early computer wavetable sound card then :-) I didn't consider that it may be processor intensive to drive, which does make some sense given its capabilities. On a semi-related note, would it have been possible to intercept OSWORD 7 and OSWORD 8 to use a different chip (be in the...
by jregel
Thu Feb 15, 2018 7:54 pm
Forum: hardware
Topic: Music 5000 - sound generation
Replies: 12
Views: 566

Re: Music 5000 - sound generation

Thanks for the links. They mention both Frequency Modulation and Wavetables, so I'm still not sure what the Music 5000 does. Is it both? Something different? Does the Music 500/5000 resemble any other computer sound chips? Can it play digital audio samples (e.g., for speech)? All very confusing to m...
by jregel
Wed Feb 14, 2018 10:30 pm
Forum: hardware
Topic: Music 5000 - sound generation
Replies: 12
Views: 566

Music 5000 - sound generation

I've been doing a bit of reading around the Music 500/5000 and trying to get an understanding of how it generated sound. Unfortunately, I've not read anything that I can relate to other computers. My understanding of computer audio is that in the early 8bit days, sound was generated using Programmab...
by jregel
Thu Dec 28, 2017 11:15 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1053
Views: 91334

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

BigEd wrote:About max latency: see previously (upthread).

About the ARM Basics: yes they have ARM assemblers built in. For the native ARM, you need BAS135. I'm sure there's an SSD around somewhere nearby. (Edit: see here)


Thanks, BigEd!
by jregel
Thu Dec 28, 2017 10:50 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1053
Views: 91334

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Thanks to Kjell, I am a happy member of the PiTubeDirect owners' club. A fantastic development, congratulations to all involved in creating this project! Although I'm mostly interested in using it for the 6502 co-pro functionality, I'm intrigued by the native ARM mode. Looking through this thread (a...
by jregel
Wed Dec 27, 2017 11:01 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 59
Views: 4223

Re: A blitter for the beeb?

Really good sound! I like it! How do you output the audio? Is it a separate audio output to the built-in Beeb sound chip? In your original description, you mentioned that it would sit in the CPU socket. I'm just curious as to whether your approach would work in any other scenarios, such as: - Could ...
by jregel
Sat Dec 16, 2017 12:46 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 59
Views: 4223

Re: A blitter for the beeb?

Wow - very impressive sound!

Just out of interest, how big are the samples that's playing and what rate is it playing back? Is it a proper MOD file?
by jregel
Fri Dec 08, 2017 10:49 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 59
Views: 4223

Re: A blitter for the beeb?

To pick up on some of the points made in recent comments: While four sound channels would be very nice, another computer to look at might be the Atari STe. The base ST model only had a Yamaha YM2149 chip (not a million miles from the Beeb), but the STe added a stereo DMA channel. It still wasn't as ...
by jregel
Mon Dec 04, 2017 8:06 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 59
Views: 4223

Re: A blitter for the beeb?

Just out of interest, do you have any idea how many software sprites the blitter could handle, e.g. 16x16 sprites in mode 1 or mode 2 at 50Hz?
by jregel
Wed Nov 29, 2017 9:52 pm
Forum: software: other
Topic: GXR questions
Replies: 5
Views: 584

Re: GXR questions

I don't know the answers to your questions, but the BBC Master Welcome disc has the SPRITER ROM image in the $.LIBRARY directory. This adds the sprite handling part of the GXR that wasn't included in the Master MOS. It was discovered (in this thread that the SPRITER code is only 9K (the remaining 7K...
by jregel
Wed Nov 29, 2017 1:34 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 59
Views: 4223

Re: A blitter for the beeb?

This is very impressive! If the functionality of the blitter could be used by the GXR VDU extensions, it could enhance existing programs (in the same way that VideoNULA does) and still "feel like a Beeb". It would also provide a very easy way into utilising its capabilities (through BASIC)...
by jregel
Mon Oct 16, 2017 2:34 pm
Forum: hardware
Topic: 6502 second processor poll
Replies: 40
Views: 1918

Re: 6502 second processor poll

If you planned to make a game for a second-processor equipped machine, you might be interested in how many people are an in a position to appreciate it. For some purposes, the proportion matters, and for others, the absolute number. For other purposes, it's all just a bit of fun. Ultimately, all th...
by jregel
Thu Oct 12, 2017 8:09 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 561
Views: 44617

Re: Palettemate / enhanced video ULA with 4096 colours

I'm very late responding to this thread, because Rob very kindly installed a VideoNuLA in my Master back in August. Due to real life, I've only just started playing with it properly and just need to say what a fabulous piece of kit it is and what a total gent Rob was for installing it for me (my sol...
by jregel
Thu Oct 12, 2017 6:38 pm
Forum: hardware
Topic: 6502 second processor poll
Replies: 40
Views: 1918

6502 second processor poll

I'm curious how many of our community have a 6502 second processor of some sort.
Given the wide range of options now available, I'm wondering if the second processor can finally be consider standard equipment...
by jregel
Mon Oct 09, 2017 7:49 pm
Forum: programming
Topic: How to you plan "large" programs?
Replies: 6
Views: 813

Re: How to you plan "large" programs?

Useful comments, thanks for the feedback!
by jregel
Mon Oct 09, 2017 1:31 pm
Forum: programming
Topic: How to you plan "large" programs?
Replies: 6
Views: 813

How to you plan "large" programs?

I'm looking for some guidance in writing "large" BASIC programs. I've broken the design down into a number of modules (screen drawing, input handling, processing specific events etc.) and I want to work on each module independently. But what's the best way to actually approach writing this...
by jregel
Sat Sep 09, 2017 11:04 am
Forum: stardot.org.uk
Topic: List of Acorn/BBC related websites
Replies: 23
Views: 2601

Re: List of Acorn/BBC related websites

Thanks. Have updated the list to reflect these changes.
by jregel
Mon Jul 31, 2017 7:10 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 561
Views: 44617

Re: Palettemate / enhanced video ULA with 4096 colours

Impressive, although 30 years ago, you could have sold thousands :-)
by jregel
Mon Jul 31, 2017 6:55 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 561
Views: 44617

Re: Palettemate / enhanced video ULA with 4096 colours

I'm guessing that last one has now been taken, but if not, I'd like to express an interest. Not yet but I'll give algenon_iii the chance to respond before putting it aside for you. Hope this is okay. Given there's a bit of interest, I'll look at ordering some more PCBs and parts. Best wishes and th...
by jregel
Mon Jul 31, 2017 5:21 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 561
Views: 44617

Re: Palettemate / enhanced video ULA with 4096 colours

I've got to ask what the going rate is for the new ULA board as I don't think I've seen a price for it (assuming there are still any available). They are £52.50 including UK P&P. I only have one left but I may order some more PCBs and make some more if there's enough demand. I'm in Newport so y...
by jregel
Wed Jul 26, 2017 1:15 pm
Forum: hardware
Topic: OS RAM module
Replies: 84
Views: 5659

Re: OS RAM module

Elminster wrote:Master has the megarom with basic, mos, terminal, view etc. In one.


Does this mean that it's simply not possible to create a Master version? :-(
by jregel
Tue Jul 25, 2017 10:00 am
Forum: programming
Topic: The £ sign in variable names?
Replies: 3
Views: 726

Re: The £ sign in variable names?

Thanks for the clarification.
by jregel
Tue Jul 25, 2017 8:04 am
Forum: programming
Topic: The £ sign in variable names?
Replies: 3
Views: 726

The £ sign in variable names?

I'm reading through the AMX SuperArt manual and disk and there are a set of routines that are designed to make WIMP interfaces easy. The provided code prefixes the variable names with a "£" and I've not come across this before: 30010 DEFPROCinit 30020 DIM £M$(5),£I%(5),£T%(5),£X%(5),£H%(5)...
by jregel
Mon Jul 24, 2017 10:32 am
Forum: hardware
Topic: *mzap and *define
Replies: 12
Views: 1155

Re: *mzap and *define

It's probably not what you're thinking of, but the AMX Super Art ROM has a *DEFINE command which takes a filename parameter and is used to load up to 32 user icons and redefines characters 128 to 255.
by jregel
Wed Jul 19, 2017 7:20 pm
Forum: general
Topic: Today I received.....
Replies: 4588
Views: 302626

Re: Today I received.....

IMG_3078.jpg


The AMX Super Art manual!

With thanks to RobC for the kind donation.
by jregel
Sun Jul 16, 2017 9:46 pm
Forum: wanted
Topic: Wanted: AMX SuperArt Manual
Replies: 2
Views: 469

Re: Wanted: AMX SuperArt Manual

Fantastic! Thank you - will PM...
by jregel
Sun Jul 16, 2017 9:17 pm
Forum: wanted
Topic: Wanted: AMX SuperArt Manual
Replies: 2
Views: 469

Wanted: AMX SuperArt Manual

Hi

I'm looking for the manual for AMX SuperArt (NOT the AMX Art/Mouse guide that's online).

Would be happy with either a physical copy (for a reasonable price) or a scan.

Thanks!