Search found 1468 matches

by RobC
Wed Jun 21, 2017 5:47 pm
Forum: software: other
Topic: Anyone developing Tube enhanced software?
Replies: 60
Views: 1039

Re: Anyone developing Tube enhanced software?

Once you've got that sorted, you'd probably want to look at improving the video system to give higher resolutions and/or more colours... Have you heard of anyone that might be working on such a beast? #-o Sorry - I should have been clearer. I was suggesting an increase in video system memory bandwi...
by RobC
Wed Jun 21, 2017 3:57 pm
Forum: software: other
Topic: Anyone developing Tube enhanced software?
Replies: 60
Views: 1039

Re: Anyone developing Tube enhanced software?

The speed of 6502 has moved on and easyily get 14Mhz or quicker. i.e. Is a 'FOURTEENMEG' board feasible, would it make a difference, I dare say the bottle neck would move else where. I think that the FOURMEG board works by having fast sideways RAM (120ns) so that reads and writes to it happen at 4M...
by RobC
Mon Jun 19, 2017 2:40 pm
Forum: software: other
Topic: Anyone developing Tube enhanced software?
Replies: 60
Views: 1039

Re: Anyone developing Tube enhanced software?

Which reminds me. Any remake of the FOURMEG is probably going to need to work around VideoNula to get the ulimate gaming experience (AND have a RPI co pro of course :) ) [I am thinking the physical dimensions of getting it all in the case] VideoNuLA fits alongside the original FOURMEG board (well a...
by RobC
Sat Jun 17, 2017 12:52 pm
Forum: hardware
Topic: Repainting a Master keyboard
Replies: 2
Views: 117

Re: Repainting a Master keyboard

Thanks - I feared that!

However, it can't be as bad as replacing all the zip rams in a 16MB A540 and that was okay once I got started...

Thanks again,

Rob
by RobC
Sat Jun 17, 2017 10:08 am
Forum: hardware
Topic: Repainting a Master keyboard
Replies: 2
Views: 117

Repainting a Master keyboard

I've been trying to sort out a Master I picked up. The machine is now working but the keyboard was filthy and the metal keyboard surround is very rusty. It's the type 1 keyboard shown here: http://8bs.com/submit/subkeyboard.htm#master128 Has anyone had success in repainting one of these? Also, do yo...
by RobC
Sun Jun 11, 2017 6:03 am
Forum: hardware
Topic: Dead A3020 parallel port.
Replies: 5
Views: 99

Re: Dead A3020 parallel port.

I had this problem on an A3020 - corrosion had damaged a couple of tracks around the parallel port. I repaired the damage with kynar wire.
by RobC
Fri Jun 09, 2017 9:27 am
Forum: hardware
Topic: MMC connected to something other than user port?
Replies: 22
Views: 466

Re: MMC connected to something other than user port?

Were you able to use MMFS with this, or did you use the original DFSMMB/SUPERMMC ROM? I'd be interested in hearing more details.Is the PIC code available to play with? I modified the original DFSMMB as this was years ago, before MMFS came out. I can dig out the PIC code and the schematic but it won...
by RobC
Fri Jun 09, 2017 7:26 am
Forum: hardware
Topic: MMC connected to something other than user port?
Replies: 22
Views: 466

Re: MMC connected to something other than user port?

hoglet wrote:Or a byte-wide memory mapped SPI interface (in a CPLD or a PIC) is already supported by MMFS.

That would actually be pretty neat, and pretty fast.

This is what I did with the PIC attached to the speech socket.
by RobC
Thu Jun 08, 2017 8:33 pm
Forum: hardware
Topic: MMC connected to something other than user port?
Replies: 22
Views: 466

Re: MMC connected to something other than user port?

I knew I hadn't imagined it!About two thirds of the way down the screen - search for speech and you'll find it straight away.A certain Rob Coleman is responsible for it! Yes - been a bit busy today or I would have replied sooner. I still have the board speech socket board somewhere. I wanted to be ...
by RobC
Thu Jun 08, 2017 7:29 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

You still have the 1bpp 2 bit attribute mode with all 6 pixels, right? Yes. So there are three cases: 1bpp, 2 bit attributes (2*4 colours), text/graphics 2bpp, 2 bit attributes (4*4 colours), text/graphics 1bpp, 3 bit attributes (2*8 colours), text only That's correct. But, as you've guessed, they ...
by RobC
Thu Jun 08, 2017 6:55 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

...and 2bpp modes (Actually it'd need to be reimplemented for 2bpp modes as the character rows would need to be split into two halves of 3 pixels instead of 4 pixels...) I was thinking of the 3-bit attribute mode - I've only implemented it for the equivalents of modes 0,3,4 and 6. However, I guess ...
by RobC
Thu Jun 08, 2017 6:13 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

To be honest, writing a ROM which works on all the OS versions is going to be a pretty big challenge as there are a good few differences in the low-level workings of the VDU drivers. Challenge Accepted! Well, I've already done a ROM to provide the extended colour screen modes, and non-ROM code to e...
by RobC
Thu Jun 08, 2017 11:17 am
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

Thanks everyone. To be fair, if it wasn't for all your suggestions around attribute modes, I wouldn't have thought of it - the implementation was the easy bit! I've been using this mode a bit this morning and I really like it - even had a little play with a quick coloured characters demo: IMG_201706...
by RobC
Wed Jun 07, 2017 9:35 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

Here's a quick demo I've knocked up of the 3-bit attribute mode. I've set the palette up with a black background and the usual Beeb colours + grey for the foreground. Rather than code up a suitable text printing routine, I just mangled JGH's ArcThin font into a separate file for each colour so I'm n...
by RobC
Wed Jun 07, 2017 6:09 pm
Forum: hardware
Topic: Round the Back of my master Compact
Replies: 5
Views: 187

Re: Round the Back of my master Compact

If you want a hard drive, you can fit GoSDC internally and then have several ADFS hard drive images on an SD card. You can also use it to store loads of floppy disk images and have them instantly accessible.
by RobC
Wed Jun 07, 2017 3:28 pm
Forum: hardware
Topic: Acorn Music 5000
Replies: 12
Views: 315

Re: Acorn Music 5000

I'm not sure that you can use a MIDI keyboard for input even if you have a Music 2000/MIDI interface.

You will need an amplifier and some speakers.
by RobC
Wed Jun 07, 2017 2:58 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

Okay - so I've implemented Dominic's suggestion. As it was pretty close to what I was doing for the 12MHz mode 1, it didn't take up too much extra logic. As Rich TW says, the way this stuff works, you get 8 sets of two colours (1 foreground + 1 background). You can set the palette up so that it's bl...
by RobC
Wed Jun 07, 2017 1:01 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

I don't know about the implementation, but to (rudely) jump in and give you a chance to expand your idea: I'm not quite sure what you are proposing here, but I don't think the clock would give 5 pixels per byte. If you are suggesting say 6, but where the 6th is colour 0 (or assumed to be a 0 bit), ...
by RobC
Wed Jun 07, 2017 12:33 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

So is this essentially still spitting out pixels at 12MHz, reading the 3 attribute bits and just replacing the leftmost (or rightmost) bit with 0? It could probably be done as I've got some space left. This would give 80x32 (or 80x25) using a 5-wide font with 8 colours + background. In fact, with 7 ...
by RobC
Wed Jun 07, 2017 9:30 am
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

That would be amazing for my project. But I think should be useful for others, i.e. if you can get one of the new screen modes up to the same standard as the minimum expected on modern machine it opens up things like, ANSI ART, easier to port GFX type programs, easier to do/better loooking client s...
by RobC
Wed Jun 07, 2017 6:56 am
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

But you can get a pretty decent 6 pixel wide font just by taking the original Acorn font and ANDing it with itself shifted left! Thanks - I've used this trick before but had completely forgotten it! For me the MODE 1 version is the most interesting one: 16 colours with reasonably good resolution. H...
by RobC
Tue Jun 06, 2017 8:38 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

Got the Mode 0 12Mhz equivalent working today. This gives a 480 x 256 pixel 8 colour mode by splitting each byte into 6 pixels and 2 attribute bits. This gives 2 colours per 6 pixel block. I've coded it so that the palette at FE21 is programmed in the same way as mode 2 as this was simpler. I've dis...
by RobC
Mon Jun 05, 2017 8:56 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

When doing the 12 MHz modes, think how this is going to work with the smooth horizontal offset stuff. Currently that has 16 MHz granularity doesn't it, which will be useless with the new modes, so you might have to go to 48 MHz granularity instead... Or use a different pixel clock base for those mo...
by RobC
Mon Jun 05, 2017 3:06 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

Ah yeah I get it, so it goes through two palette lookups - once through the standard palette to get an actual physical colour index, and then looks that up in your extended palette (is that right?). In which case I see less need for a second switchable palette. Changing 4 6 colours per scanline (24...
by RobC
Mon Jun 05, 2017 12:42 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

Rob, is the extended palette implemented the same as the regular palette? e.g. in 4 colour modes is it necessary to write 4 entries per colour? It's two 8-bit writes to FE23 to change any physical colour: 1st write is 4-bit physical colour number + 4-bit red value, 2nd write is 4-bit green value + ...
by RobC
Mon Jun 05, 2017 11:09 am
Forum: hardware
Topic: Riscstation R7500 networking
Replies: 0
Views: 75

Riscstation R7500 networking

Having sorted out the hard drive on my Riscstation yesterday, I thought that I'd got networking sorted out too. I put in an Autosense file in to pick up the EtherS driver (v1.22 in ROM) and was then able to configure the interface. *esinfo and *estest produced sensible results. However, trying to tr...
by RobC
Mon Jun 05, 2017 11:04 am
Forum: hardware
Topic: Riscstation R7500 video bandwidth
Replies: 2
Views: 91

Re: Riscstation R7500 video bandwidth

Thanks. That's what it's currently set to but it won't let me go above 16 colours at 1024x768.

Is there anywhere else in the boot sequence that controls the available resolutions? I'm using the Acorn AKF95 MDF...
by RobC
Sun Jun 04, 2017 8:26 pm
Forum: hardware
Topic: Riscstation R7500 video bandwidth
Replies: 2
Views: 91

Riscstation R7500 video bandwidth

Got my Riscstation R7500 out today and did managed to get it up and running. I had to replace the hard drive so formatted a new one with the Simtec IDETool and installed the standard RO4 boot sequence. Also managed to sort out networking by putting in an EtherS autosense file. The machine is working...
by RobC
Sat Jun 03, 2017 8:56 am
Forum: hardware
Topic: Which Archimedes model?
Replies: 16
Views: 297

Re: Which Archimedes model?

The A5000 would be my choice as it has an ARM3 as standard (so is quick compared to most Arcs) and has a built-in IDE interface (you can also fit a Wizzo ROM to improve CF compatibility and use multiple partitions). It's a fairly large 3-box design so that maybe an issue if desk space is limited. Th...
by RobC
Fri Jun 02, 2017 4:15 pm
Forum: other vintage computer hardware, software and games
Topic: Tatung Einstein TC01 PSU Specifications?
Replies: 20
Views: 415

Re: Tatung Einstein TC01 PSU Specifications?

Hi Mario, Just wanted to add my thanks for all your efforts. My uncle got me interested in computers and had an Einstein so it was one of the first retro machines I got hold of (after the Beeb!). Your site was invaluable in allowing me to find out how to get it to do anything and in putting me in co...

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