Search found 124 matches

by roganjosh
Thu Aug 22, 2019 7:32 am
Forum: 8-bit acorn hardware
Topic: Fixed: Mode 7 intermittent lines
Replies: 46
Views: 2923

Re: Mode 7 intermittent lines

All started off fine as I saw no interference/loss of sync but once the machine had warmed up for 5-10 mins it was back :( I guess the next thing to try is to look at some of the video timing associated ICs . At least I know it has a new 16MHz crystal now. I suspect that the lines are artefacts com...
by roganjosh
Sun Aug 18, 2019 12:33 pm
Forum: 8-bit acorn hardware
Topic: Fixed: Mode 7 intermittent lines
Replies: 46
Views: 2923

Re: Mode 7 intermittent lines

What I will add is that every time the interference occurs, the video converter has to re-sync itself as if the video stream is interrupted/corrupted briefly. I had exactly the same issue on several Model Bs (horizontal lines & sync loss) as I've reported elsewhere. In all cases replacement of the ...
by roganjosh
Sat Aug 10, 2019 8:53 pm
Forum: general
Topic: Master spray job
Replies: 36
Views: 3268

Re: Master spray job

A year on from doing the spray job I can report that the colour of the case hasn't changed. Vinyl dye, as surmised, appears to provide a long lasting solution for hobbyists with a dislike of yellowed cases. I unashamedly include myself in that category. I had a quick look at their "Natural" preparat...
by roganjosh
Wed Jul 31, 2019 1:32 pm
Forum: off-topic
Topic: Windows 10....
Replies: 175
Views: 21659

Re: Windows 10....

I had problems with a previous upgrade. After a bit of head scratching the solution was to remove the antivirus software (in this case AVAST) before doing the W10 upgrade.

That's no help given your current state though. Good luck.

Alan
by roganjosh
Tue Jul 30, 2019 7:00 pm
Forum: 8-bit acorn emulators
Topic: Beebem & Osbyte $EA
Replies: 2
Views: 487

Re: Beebem & Osbyte $EA

Well, doing that you've just turned the Tube software off in an inconsistant way! lda #$ea ; Tube presense flag ldx #$00 ; Write &00 ldy #$00 ; Don't read jsr osbyte ; Do osbyte &EA,0,0 - turn Tube software off stx $70 rts Some filing systems read the OSBYTE &EA variable every time they do a data t...
by roganjosh
Tue Jul 30, 2019 2:51 pm
Forum: 8-bit acorn emulators
Topic: Beebem & Osbyte $EA
Replies: 2
Views: 487

Beebem & Osbyte $EA

I find that Beebem (Windows, 4.14) is having problems with Osbyte $EA when the Master 128 + 65Co2 coprocessor options are selected. The following example code: lda #$ea ldx #$00 ldy #$00 jsr osbyte stx $70 rts should leave $ff in location $70 if tube hardware & software is detected. Most of the time...
by roganjosh
Sat Jun 22, 2019 2:12 pm
Forum: programming
Topic: RNDX and Master
Replies: 8
Views: 803

Re: RNDX and Master

In Basic 4.32 (which I think is version 07) RND(x) starts at B302: https://github.com/hoglet67/BBCBasic4r32/blob/master/disassembly/Basic432.asm#L9889 Dave For completeness, after looking at the disassembly, it looks to me as though RNDX on Basic07 is at $aab0. So the full list is therefore: BASIC1...
by roganjosh
Sat Jun 22, 2019 9:14 am
Forum: programming
Topic: RNDX and Master
Replies: 8
Views: 803

Re: RNDX and Master

The $aa52 address is spot on for BASIC04 thanks. Unfortunately $b302 under BASIC07 throws a "No such variable error".

Alan
by roganjosh
Fri Jun 21, 2019 7:10 pm
Forum: programming
Topic: RNDX and Master
Replies: 8
Views: 803

Re: RNDX and Master

Thanks to you both. I'll give them a whirl.

Alan
by roganjosh
Fri Jun 21, 2019 6:04 pm
Forum: programming
Topic: RNDX and Master
Replies: 8
Views: 803

Re: RNDX and Master

Ta for the reply.

I'm doing the porting initially under BeebEm but also want to have it work under my real hardware. *ROMS gives '04' and '07' for those platforms. If I had to choose only one then it'd be '07'.
by roganjosh
Fri Jun 21, 2019 5:45 pm
Forum: programming
Topic: RNDX and Master
Replies: 8
Views: 803

RNDX and Master

I'm doing some porting from Model B to Master 128. One of the programs has a call to $af24 (BASIC2 ROM rndx). This causes a crash on BASIC 4. Given that the Advanced BASIC ROM User Guide only deals with BASIC1&2 is there such a thing that gives equivalent routine locations in BASIC 4? If not then, m...
by roganjosh
Mon Jun 10, 2019 8:56 pm
Forum: 8-bit acorn software: other
Topic: makegamedata
Replies: 1
Views: 424

Re: makegamedata

Enough time has passed, I hope, for replying to my own posting not to be bad netiquette. In the end I managed to get the elderly Visual Basic 6 installed on a Windows 10 laptop. An interesting diversion. That enabled me to boost the relevant arbitrary limit and produce a new version of makegamedata....
by roganjosh
Thu Jun 06, 2019 6:29 pm
Forum: 8-bit acorn software: other
Topic: makegamedata
Replies: 1
Views: 424

makegamedata

makegamedata is the program used by (e.g.) DCBEEB to convert program description files into a binary file used by the main menu program. Unfortunately the program was written in an early flavour of Visual Basic. The source code sets arbitrary array limits and it crashes out on my large dataset with ...
by roganjosh
Mon Jun 03, 2019 7:39 pm
Forum: 8-bit acorn hardware
Topic: Converting BBC Micro's to HDMI
Replies: 24
Views: 3078

Re: Converting BBC Micro's to HDMI

That would indeed fit with experience. Thanks.
My scope showed the signal at IC43 pin 6 as being very close to 16MHz. There was nothing grossly abnormal about the trace. I didn't bother with my dedicated frequency counter.

Alan
by roganjosh
Sun Jun 02, 2019 8:53 am
Forum: 8-bit acorn hardware
Topic: Converting BBC Micro's to HDMI
Replies: 24
Views: 3078

Re: Converting BBC Micro's to HDMI

Glad the info was useful. As an addendum to this I've just bought a spare Model B. It showed exactly the same sync problem with the Elephas converter. Having found from my first B that it wasn't particularly bothered by the shape of the sync pulses I headed straight for crystal X1 (16MHz) and replac...
by roganjosh
Sun May 19, 2019 7:37 pm
Forum: off-topic
Topic: LOLPRICE
Replies: 2996
Views: 333865

Re: LOLPRICE

One for the loaded collectors:

https://www.ebay.co.uk/itm/CABLETRONIC- ... 4204671594?

You could get 35 Jupiter Aces for that.
by roganjosh
Fri May 10, 2019 10:13 am
Forum: programming
Topic: Assembly language text adventure
Replies: 83
Views: 6893

Re: Assembly language text adventure

I've been working on my wordwrap amendment for displaying the list of objects in a location eg "You are carrying a book, a bell and a candle." and it works except for the final noun. I suspect it's the commas and the "and" at fault so I'd like to use A=GET each time the wordwrap routine is called t...
by roganjosh
Thu May 09, 2019 4:45 pm
Forum: 8-bit acorn hardware
Topic: Converting BBC Micro's to HDMI
Replies: 24
Views: 3078

Re: Converting BBC Micro's to HDMI

Thanks for that info - I assumed it might be a timing problem - I'll look into scoping it at some stage and experiment with a schottky diode between the sync pin and GND ... It did turn out to be a timing problem. Replacing IC41 and IC48 with 74ALS types helped clean up the undershoot. However, ful...
by roganjosh
Tue May 07, 2019 12:52 pm
Forum: programming
Topic: Beebasm high order bits
Replies: 6
Views: 774

Re: Beebasm high order bits

Bingo. Thanks very much. Works a treat.

Alan
by roganjosh
Tue May 07, 2019 7:31 am
Forum: programming
Topic: Beebasm high order bits
Replies: 6
Views: 774

Re: Beebasm high order bits

Iirc, DFSs only has 18 bits and that is supported by beebasm, so save with address &3xxxx and it will show as F in a *I. PS, this is to stop it going over the tube! Thanks. However, if I put in any address over &FFFF I get "error: Out of range." That's using (e.g.) SAVE "test", &32100, &321ff, &321...
by roganjosh
Mon May 06, 2019 10:34 pm
Forum: programming
Topic: Beebasm high order bits
Replies: 6
Views: 774

Beebasm high order bits

I'm currently developing some Tube code using beebasm 1.09. However, I can't seem to find a way to have the high order bits set for load and execution addresses. Is this a syntax problem on my part, if so I'd be grateful to learn how to achieve it, or did the changes to enable this (which I can see ...
by roganjosh
Sun Apr 28, 2019 11:50 am
Forum: 8-bit acorn hardware
Topic: Converting BBC Micro's to HDMI
Replies: 24
Views: 3078

Re: Converting BBC Micro's to HDMI

My own experience of the metal-boxed SCART->HDMI converters that look exactly like the photos from the other thread has been a little odd. Those such ones I've tried that are not specifically advertised as being made by ELEPHAS do not convert RGB, only composite. The ones advertised as being made by...
by roganjosh
Mon Apr 01, 2019 9:57 pm
Forum: the complete BBC games archive
Topic: Downloading ssds
Replies: 19
Views: 2182

Re: Downloading ssds

Given that this thread has been inactive for a couple of months I thought I'd better point out that the problem is still there when using Edge.

Alan
by roganjosh
Wed Mar 13, 2019 3:36 pm
Forum: 8-bit acorn hardware
Topic: Master audio noise
Replies: 13
Views: 937

Re: Master audio noise

Also be aware that if you fit the 1K0 resistor then playing back audio through the 1MHz bus will be affected (e.g. BeebSID will be silent except via its external audio output). The resistor is a kind of sideways boosting of the signal from one part of the audio stage to another and you may therefore...
by roganjosh
Tue Jan 22, 2019 10:52 pm
Forum: the complete BBC games archive
Topic: Downloading ssds
Replies: 19
Views: 2182

Re: Downloading ssds

MartinB wrote:
Tue Jan 22, 2019 9:00 pm
In Edge under Windows 10 (and probably other OS), you can just Right-Click on the [Download] box and select 'Save Target as'
Though that works with Firefox, using Edge the filetype is then set to HTML despite it being an ssd file.
by roganjosh
Tue Dec 25, 2018 9:14 pm
Forum: general
Topic: Bit of fun - One change only
Replies: 97
Views: 6389

Re: Bit of fun - One change only

I'd have used them a lot more out-of-the-box for experimental data capture and analysis if they'd had a 16 bit ADC as standard. When I saw the subject line I thought it was going to be an I'm Sorry I Haven't A Clue one letter changing round, half expecting to see the BBC Yodel B, BBC Easter and Acor...
by roganjosh
Sat Dec 22, 2018 3:42 pm
Forum: 8-bit acorn hardware
Topic: Over-etched pads
Replies: 8
Views: 730

Re: Over-etched pads

Ah, good, ta. It sounds like I can put my feet up. Your comment does remind me, though, of an old SF programme where someone needed "an extremely fine pair of brain tweezers".

Alan
by roganjosh
Sat Dec 22, 2018 3:09 pm
Forum: 8-bit acorn hardware
Topic: Over-etched pads
Replies: 8
Views: 730

Re: Over-etched pads

Attempting to answer all the points, I don't know whether it works yet as I'm still waiting for the thing that plugs into it to arrive. It's not just the gold plating that's missing, it's the underlying copper as well. I've heard horror stories when people have tinned such pads so I've always avoide...
by roganjosh
Sat Dec 22, 2018 2:01 pm
Forum: 8-bit acorn hardware
Topic: Over-etched pads
Replies: 8
Views: 730

Re: Over-etched pads

Thanks for the reply. Such a simple question but it meant a 95% dismantle of the kit. I've attached the best I can do with the cameras I have. As you can see there is some nibbling-n at the side of one of the pads. You may also see a horizontal hairline break of the pad across most of the width. The...
by roganjosh
Sat Dec 22, 2018 9:50 am
Forum: 8-bit acorn hardware
Topic: Over-etched pads
Replies: 8
Views: 730

Over-etched pads

I've a piece of retro kit where a couple of PCB edge card connector pads have been over-etched on one side, possibly because they're adjacent to a notch. The pads are gold plated. What paint/pen/etc product would people here recommend (and how many coats) to patch them up a bit?

Alan

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