Search found 1788 matches

by RobC
Fri Nov 24, 2017 8:34 pm
Forum: introduce yourself
Topic: Ahoy there!
Replies: 8
Views: 68

Re: Ahoy there!

Welcome Jeffrey - the BeagleBoard port got me back into using RISC OS and 32-bit Acorn machines.
by RobC
Thu Nov 23, 2017 2:51 pm
Forum: hardware
Topic: ZX81 emulator
Replies: 29
Views: 706

Re: ZX81 emulator

Do you have any plans to make your ZX81 emulator available as that would be a great starting point to prove any toolchain Yes - once I've got it in a good state, I'll put it up here. If you want to PM me in the meantime, I'll send you things as they stand now. I have now added loading and rough ins...
by RobC
Wed Nov 22, 2017 10:41 pm
Forum: emulators
Topic: Emulator support for VideoNuLA
Replies: 49
Views: 2760

Re: Emulator support for VideoNuLA

Hey Rob, I think there are some timing issues with the SOTB demo - if you enable "full borders" in the display options for b-em there are about 3 character rows being "displayed" outside of (above) the visible region?! Sorry for not replying sooner - life has been quite hectic t...
by RobC
Wed Nov 22, 2017 9:42 pm
Forum: hardware
Topic: ZX81 emulator
Replies: 29
Views: 706

Re: ZX81 emulator

That's awesome - I knew that there were Speculators for machines other than the Einstein but had never seen details before.

Many thanks.
by RobC
Wed Nov 22, 2017 7:13 pm
Forum: hardware
Topic: ZX81 emulator
Replies: 29
Views: 706

Re: ZX81 emulator

To be honest I mainly suggested it as an excuse to use the rather poor SpectROM pun but if it was actually possible that would be something! As I mentioned at the ABUG weekend, there was a hardware Spectrum emulator for the Tatung Einstein called the "Speculator"! I think SpectROM is a be...
by RobC
Wed Nov 22, 2017 9:12 am
Forum: hardware
Topic: ZX81 emulator
Replies: 29
Views: 706

Re: ZX81 emulator

Is there a 16 palette 1bpp 4pixel per byte mode? Or room for one? It's not there but was one of the things I considered adding before the current attribute modes were put in. Unfortunately, I don't think there's enough room to add it in now but, as the CPLD can be reprogrammed, I could do a custom ...
by RobC
Wed Nov 22, 2017 7:26 am
Forum: hardware
Topic: ZX81 emulator
Replies: 29
Views: 706

Re: ZX81 emulator

Trouble is, the Beeb can't actually do the Spectrum's display! One of my thoughts for VideoNuLA was to implement something that could mimic the Spectrum's display using alternate bytes for colour attributes and pixel data. The attributes would have affected each 8 x 1 pixel block as with the Thomso...
by RobC
Tue Nov 21, 2017 7:03 pm
Forum: software: classic games
Topic: Galaforce for NULA (16 Colour)
Replies: 17
Views: 859

Re: Galaforce for NULA (16 Colour)

That looks awesome =D>
by RobC
Tue Nov 21, 2017 10:52 am
Forum: hardware
Topic: ZX81 emulator
Replies: 29
Views: 706

Re: ZX81 emulator

It's a great idea, Rob, to do this by writing a C application for the Native ARM - I think the page we need is one about doing that. I'd've thought it's not quite a bare-metal ARM, in that you're writing to the SWIs provided in PiTubeDirect, which is then doing the work of talking to the host over ...
by RobC
Tue Nov 21, 2017 9:10 am
Forum: hardware
Topic: ZX81 emulator
Replies: 29
Views: 706

Re: ZX81 emulator

Is the information how to build native apps fo the Pi Copro on the Wiki (https://github.com/hoglet67/PiTubeDirect/wiki). Sounds like fun. Great little project. Not sure but I used this as a guide after Dave/hoglet pointed me at it: http://www.valvers.com/open-software/raspberry-pi/step01-bare-metal...
by RobC
Tue Nov 21, 2017 7:31 am
Forum: hardware
Topic: ZX81 emulator
Replies: 29
Views: 706

Re: ZX81 emulator

I thought the ZX81 amd ZX80 cheated by having next to no video circuitry and expecting the CPU to produce the output either via NMI or by turning the screen off while processing and enabling it only while waiting for input? I'm fascinated to know how you manage to get such a display reproduced via ...
by RobC
Mon Nov 20, 2017 10:26 pm
Forum: hardware
Topic: ZX81 emulator
Replies: 29
Views: 706

Re: ZX81 emulator

It's running on the native Pi core - after figuring out how to build C applications for it with the PDP11 emulator, it was pretty simple.
by RobC
Mon Nov 20, 2017 10:21 pm
Forum: hardware
Topic: ZX81 emulator
Replies: 29
Views: 706

ZX81 emulator

Didn't quite manage to get this working at ABUG but it's working now: a Pi co-pro ZX81 emulator for the Beeb. The ZX81 was the first computer I ever encountered - my uncle had built one from a kit and showed it to me when I was seven. I was immediately hooked and my parents bought me one of my own a...
by RobC
Mon Nov 20, 2017 8:31 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 139
Views: 4519

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

It was good to meet up with everyone and especially good to meet some people in person for the first time. The weekend went very quickly so it must have been fun! Thanks to Phil for showing me the Clwyd Technics palette extender - this is similar to Mike Cook's Chameleon but was from 1982/83 and so ...
by RobC
Fri Nov 17, 2017 2:05 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 139
Views: 4519

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

I'll be arriving tomorrow too. My plan is to bring some soldering kit as I'll be fitting some VideoNuLA boards. (I'll also have a few spares if anyone wants to buy one!) I'll bring a Beeb running Unix under the Pi copro PDP11 emulator and my laptop in case I get a chance to do some work on BeebJack....
by RobC
Wed Nov 15, 2017 9:48 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 139
Views: 4519

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

IanS wrote:Anyone going at the weekend got a spare dram chip KM41C1000P-12 (1Mx1bit), or equivalent they can bring along for my A440/R140?

viewtopic.php?f=16&t=14064

I'll have a look - I picked up some Arc RAM chips a while back.
by RobC
Wed Nov 15, 2017 7:56 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1109

Re: Unix on the Beeb

So, if I understand correctly we have a PDP emulator running on a real ARM in the form of Pi Tube Direct. Yes. In all of that do we have a portable (e.g C) PDP emulator or is it in ARM assembler? It's based on the Sanos PDP11 SimH emulator which is in C: http://www.jbox.dk/sanos/pdp11.htm It only n...
by RobC
Wed Nov 15, 2017 4:20 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1109

Re: Unix on the Beeb

I've now got this working on the native Pi co-pro. It needs the changes implemented in the Diamondback dev release but seems to be running happily on my 1GHz Pi Zero. As expected, it's much faster than the ARMTDMI and certainly feels comparable to my recollections of using Unix on a mainframe in the...
by RobC
Tue Nov 14, 2017 3:02 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 139
Views: 4519

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

Last time at Markfield I managed to repair my A4 keyboard connector, which was nice. Unfortunately since then my A4 has failed in another way. Would anyone be willing to assist in a little diagnostic help over the weekend? Happy to try to help. I can bring a working A4 PSU if that would help? Think...
by RobC
Tue Nov 14, 2017 12:27 pm
Forum: projects
Topic: Starting a Prince of Persia port...
Replies: 140
Views: 8653

Re: Starting a Prince of Persia port...

Looking forward to seeing this :D

Given that it's already Master-only, is it worth thinking about just requiring an extra 16K of sideways RAM? I'm guessing that many Master owners have a cartridge that gives RAM in slot 0/1 or 2/3.
by RobC
Tue Nov 14, 2017 10:30 am
Forum: introduce yourself
Topic: Hello, I am a keen acorn owner and hope to take part in the forum.
Replies: 12
Views: 350

Re: Hello, I am a keen acorn owner and hope to take part in the forum.

Welcome to the forum and best wishes for the rest of your treatment.
by RobC
Sun Nov 12, 2017 4:56 pm
Forum: software: other
Topic: DOS Plus assisstance
Replies: 6
Views: 194

Re: DOS Plus assisstance

ERASE filename

works for me.
by RobC
Fri Nov 10, 2017 11:02 pm
Forum: hardware
Topic: Running DosPlus (version 2.1) with Raspberry Pi 80286 processor emulator on BBC master 128.
Replies: 25
Views: 825

Re: Running DosPlus (version 2.1) with Raspberry Pi 80286 processor emulator on BBC master 128.

is it possible to copy the dosboot from the cf card to a physical floppy and boot up the old fashioned way? Not sure - I'll have a look at my original boot disk to see what format it's in and what's on there. Also, how do you access/use the panos stuff with the pitube pandora copro option? From ADF...
by RobC
Fri Nov 10, 2017 4:54 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1109

Re: Unix on the Beeb

Thanks - 16MB should be more than enough as it runs on the 4MB ARM 2 core. I'll have a look at recompiling it with 16MB. EDIT: Thanks to Dave's suggestion, I now have the Pi CoPro reporting 16MB from BAS135. Still can't get the PDP-11 emulator working though as it's now hanging when trying to boot t...
by RobC
Fri Nov 10, 2017 2:55 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1109

Re: Unix on the Beeb

I've been looking at building the PDP11 emulator for the native Pi copro and have now figured out how to build C executables for it and have the stubs library connected up. Unfortunately, the emulator needs more than the current limit of 2MB as it is complaining that it can't allocate enough memory ...
by RobC
Thu Nov 09, 2017 5:52 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1109

Re: Unix on the Beeb

Boydie wrote:Is it compiled for arm1 or arm2? ie Will it work on a real arm evaluation system?

ARM2. I might be able to build it for ARM1 with an early version of the Norcroft compiler - it gave a lot of errors when I tried but it wouldn't be impossible to port.
by RobC
Thu Nov 09, 2017 4:14 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1109

Re: Unix on the Beeb

Ah, what will be happening is that the Unix console will be sending anything it doesn't understand to the the system the emulator is running on. Which in this case is ultimately the BBC VDU, so by the accident of you running the PDP11 emulator on a system with the BBC VDU drivers, you are sending t...
by RobC
Thu Nov 09, 2017 4:09 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1109

Re: Unix on the Beeb

I am guessing you built in for the 26 Bit ARM 2 mode? Yes for the ARM Evaluation system version but the ARM7TDMI version is 32-bit. It is much faster on the ARM7TDMI copro and borders on usable. Maybe on the Pi CoPro you could build it for the Native ARM mode. This would make it a lot faster ;) My ...
by RobC
Thu Nov 09, 2017 12:15 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1109

Re: Unix on the Beeb

sweh wrote:Character 4 is the standard Unix EOF character; possibly it's being filtered out? Try doing VDU 19,0,&34,0,0,0 instead...

Spot on - &34 set it to blue (so did &14 and &24) so the OS is treating &04 differently.

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