Search found 35 matches

by dhoggan
Wed May 15, 2019 11:39 am
Forum: hardware
Topic: Help Needed with 6502 Second Processor
Replies: 18
Views: 768

Re: Help Needed with 6502 Second Processor

Hi everyone, I'm looking at replacing the fixed IDC connector on the 6502 board with an IDC box header (the type which has the latch on one side) so I can then use a standard 40-way IDC cable. However, as I've been trying different things in between work commitments, I've manage to lose/forget the c...
by dhoggan
Sun May 05, 2019 12:31 pm
Forum: hardware
Topic: Help Needed with 6502 Second Processor
Replies: 18
Views: 768

Re: Help Needed with 6502 Second Processor

Mr BeebMaster,

Just saw your post after my last one.

Inside the second processor the connector is attached to the board - so either it has to be desoldered or the IDC cable extracted from the connector and a new one inserted. It's not a straight swap on this unit I'm afraid.

Thanks,

Dave
by dhoggan
Sun May 05, 2019 12:28 pm
Forum: hardware
Topic: Help Needed with 6502 Second Processor
Replies: 18
Views: 768

Re: Help Needed with 6502 Second Processor

Yes, I have had a look inside and the IDC connector is soldered to the board, so complicates replaces a little bit - I'm assuming that this is the translation connector you referred to? As for additional length, that makes sense, but even an extra 10cm would be really hand, if possible. Based upon w...
by dhoggan
Sun May 05, 2019 11:34 am
Forum: hardware
Topic: Help Needed with 6502 Second Processor
Replies: 18
Views: 768

Re: Help Needed with 6502 Second Processor

Ah yes, I remember them but alas I do not have any to hand. Before I go off an buy one however, from the link you provided it seems to suggest that I would have to replace the IDC connector on the second processor board? I am I reading that wrong - can I simply use a normal 40 IDC cable with no mods...
by dhoggan
Sun May 05, 2019 11:04 am
Forum: hardware
Topic: Help Needed with 6502 Second Processor
Replies: 18
Views: 768

Re: Help Needed with 6502 Second Processor

Hi, I've just gone to try these suggestions and have noticed that there is a small break in one of the cable making up the 40-way IDC cable - it's one of the outer tracks. Can anyone recommend a source of a new cable? I could try making one up but I'm not wonderfully adept at these things. If there ...
by dhoggan
Sun May 05, 2019 10:19 am
Forum: hardware
Topic: Help Needed with 6502 Second Processor
Replies: 18
Views: 768

Help Needed with 6502 Second Processor

Hi everyone, A bit on a Bank Holiday conundrum for you! I have finally found some time to set up the 6502 second processor I recently received from eBay, but seem to be having issues. Currently I have the ROM sockets set up as follows: <OS>, <DNFS>, blank, blank, <BASIC>. I'm pretty sure the DNFS RO...
by dhoggan
Wed Apr 24, 2019 1:41 pm
Forum: wanted
Topic: Wanted: DNFS ROM (and Maybe Hi-BASIC)
Replies: 10
Views: 449

Re: Wanted: DNFS ROM (and Maybe Hi-BASIC)

Oooh, thanks for the offer but I've already ordered them from Mark at Retroclinic. Just waiting for them (and and the second processor!) to arrive.

Dave
by dhoggan
Mon Apr 22, 2019 12:19 pm
Forum: wanted
Topic: Wanted: DNFS ROM (and Maybe Hi-BASIC)
Replies: 10
Views: 449

Re: Wanted: DNFS ROM (and Maybe Hi-BASIC)

Thanks everyone - I'll drop Mark an email to see if he can help.

As for loading off disk, that makes sense but right now I'm looking for a single disk drive as my unit has packed up. So until I find one of those, I'll settle on the chip version.At least it'll get me up-and-running.

Thanks,

Dave
by dhoggan
Mon Apr 22, 2019 10:41 am
Forum: wanted
Topic: Wanted: DNFS ROM (and Maybe Hi-BASIC)
Replies: 10
Views: 449

Re: Wanted: DNFS ROM (and Maybe Hi-BASIC)

Hi, Yes, the prices are a bit high, but in the absence of anything else - assuming they actually have them. Whilst the idea of buying a EPROM programmer is appealing (not least 'cos I might actually get COMAL that way and complete my childhood setup!), I was hoping to keep things original if possibl...
by dhoggan
Mon Apr 22, 2019 7:49 am
Forum: wanted
Topic: Wanted: DNFS ROM (and Maybe Hi-BASIC)
Replies: 10
Views: 449

Wanted: DNFS ROM (and Maybe Hi-BASIC)

Hi,

I recently picked up a 6502 second processor off eBay, but it doesn't have the DNFS or Hi-Basic ROMs. I have found CJE has the Hi-BASIC one, but does anyone have a spare DNFS one that I can buy. If you do have Hi-BASIC then might be interested in that too - keeps shipping simple.

Thanks,

Dave
by dhoggan
Tue Aug 28, 2018 7:40 pm
Forum: hardware
Topic: Microcitec Cub 452 (Lack of) Display Issue
Replies: 10
Views: 583

Re: Microcitec Cub 452 (Lack of) Display Issue

Hi Dave,

No problem - right now I’m in the middle of building a log cabin so all my attention is on that. But I will then actually have a place to permanently setup the Beeb, so happy to wait. It’ll just be good to know whether he’s willing out not so I can add it to my options.

Thanks,

Dave
by dhoggan
Sat Aug 18, 2018 11:28 am
Forum: hardware
Topic: Microcitec Cub 452 (Lack of) Display Issue
Replies: 10
Views: 583

Re: Microcitec Cub 452 (Lack of) Display Issue

Hi Dave,

Thanks for the info and sounds like he might be a good place to start. Do you have an email address for him? I’m hoping he would be happy for me to ship it - assuming that he’d be intested.

Would have sent a PM, but that feature is still disbaled :-(

Thanks,

Dave
by dhoggan
Fri Aug 17, 2018 6:22 pm
Forum: hardware
Topic: Microcitec Cub 452 (Lack of) Display Issue
Replies: 10
Views: 583

Re: Microcitec Cub 452 (Lack of) Display Issue

Ah, thanks. So, there is hope :-) I guess the question then is: repairable by someone of average competence (me!) or by a specialist? As Microvitec no longer do repairs themselves (at least according to their web site), is there someone who repairs Cub monitors that anyone here could recommend? Othe...
by dhoggan
Fri Aug 17, 2018 4:07 pm
Forum: hardware
Topic: Microcitec Cub 452 (Lack of) Display Issue
Replies: 10
Views: 583

Re: Microcitec Cub 452 (Lack of) Display Issue

Hi Mark, There's no obvious change in the lines with the BBC on or off, or even unplugged. And yes, you've described it exactly. The slight glow on the screen is simply as I've upped the brightness a bit, but the display is two or three fines lines - not a single line. It appears that these are scro...
by dhoggan
Fri Aug 17, 2018 3:11 pm
Forum: hardware
Topic: Microcitec Cub 452 (Lack of) Display Issue
Replies: 10
Views: 583

Microcitec Cub 452 (Lack of) Display Issue

Hi, I've managed to pick up a Cub 1431 in reasonably good condition, but it seems to have a bit of an issue. It powers on but all I get is the following, whether or not I have the RGB cable plugged in. 452 front.jpg What is interesting is that it has more options than other Cubs I've seen on the rea...
by dhoggan
Fri Aug 10, 2018 7:00 pm
Forum: hardware
Topic: Restoring an Issue 2 Model B to Original State
Replies: 7
Views: 560

Re: Restoring an Issue 2 Model B to Original State

Ah, thanks for the confirmation on the PSU. Looks like I'm now looking for linear PSU then :roll: This is not going to be the Beeb I used all the time, but - and I know this sounds plain daft - it seems fitting to try and keep one its original form, even if it is ultimately less usable. I'm definite...
by dhoggan
Thu Aug 09, 2018 10:58 pm
Forum: hardware
Topic: Restoring an Issue 2 Model B to Original State
Replies: 7
Views: 560

Re: Restoring an Issue 2 Model B to Original State

I suspect that it is not the original PSU - it's a switched mode one (now recapped after it stank out the study). I would have thought that an Issue 2 would have still used the linear PSU. (it is both frustrating and enticing that a lot of the version history of the Beeb appears to be 'fuzzy'). The ...
by dhoggan
Thu Aug 09, 2018 1:33 pm
Forum: hardware
Topic: Troubleshooting the Analogue Port with DB9 Joystick Adapter
Replies: 7
Views: 522

Re: Troubleshooting the Analogue Port with DB9 Joystick Adapter

Just an update - I found some screws that secure the analogue port by attaching it to the two mounting columns on the base.

Pozi Pan self tapping A2 Stainless steel, No.6 1/2"
by dhoggan
Thu Aug 09, 2018 1:28 pm
Forum: hardware
Topic: Restoring an Issue 2 Model B to Original State
Replies: 7
Views: 560

Restoring an Issue 2 Model B to Original State

I have recently received an issue 2 model B and think it would be nice to return it to its original state. One of the first things I'm looking at removing is what appears to be a sideways ROM board - once this has gone, I'll have a much clearer view of the motherboard. Before I plow ahead and start ...
by dhoggan
Mon Aug 06, 2018 10:10 pm
Forum: hardware
Topic: Acorn Sales Figures of Model A/B
Replies: 4
Views: 418

Re: Acorn Sales Figures of Model A/B

Thanks for that link - interesting read and now got to find a way to work 'German tank problem' into casual conversation :-) Still, it makes me wonder; some units have motherboards with a serial on them; others have one on the case - makes me wonder whether - unless owned from new - if anyone can ev...
by dhoggan
Mon Aug 06, 2018 12:42 pm
Forum: hardware
Topic: Acorn Sales Figures of Model A/B
Replies: 4
Views: 418

Acorn Sales Figures of Model A/B

Whilst I busy myself with renovating an Issue 7 model B, I thought I'd learn a bit about the history and various revisions. I'm having a bit of trouble finding specific answers so hope no-one minds me asking here :-) I'll post them as separate questions as they aren't really related. I've read that ...
by dhoggan
Thu Aug 02, 2018 4:54 pm
Forum: general
Topic: Microvitec Paint... What is it?
Replies: 1
Views: 251

Microvitec Paint... What is it?

Hi, Does anyone know what type of paint the Microvitec Cub (the metal box variety) is? Specifically, is it acetone (in this case, a lovely scented nail polish remover) soluable. I have managed to get hold of a 1451 will unmarked glass but tatty-as-anything shell. I've used a damp cloth to remove the...
by dhoggan
Thu Aug 02, 2018 4:46 pm
Forum: general
Topic: Spring Cleaning the Motherboard
Replies: 18
Views: 828

Re: Spring Cleaning the Motherboard

I has assumed that the insertion and extraction tools were the same, but since the recommendation is to gently pry them out from alternating ends, I'll be going for that approach. No I'm back home I can start looking at how best to disassemble the Beeb and see how best to disassemble the case and st...
by dhoggan
Wed Aug 01, 2018 9:57 am
Forum: general
Topic: Spring Cleaning the Motherboard
Replies: 18
Views: 828

Re: Spring Cleaning the Motherboard

Thanks for all the advice - very useful. I think I’ll be looking at buying a DIL insetion tool from somewhere just to avoid any tears. Just been watching one of the 8 Bit Guy video (and thanks for recommending that!) on comparing bleaching techniques so off to buy some 40 vol peroxide as we seem to ...
by dhoggan
Tue Jul 31, 2018 6:53 pm
Forum: general
Topic: Spring Cleaning the Motherboard
Replies: 18
Views: 828

Re: Spring Cleaning the Motherboard

Oh, OK. There doesn't appear to be any leakage so I’ll give the vinegar a miss, but I’ll give the IPA a go. Do you normally desocket the ICs or leave them in?

As for the case, I am tempted by the Bblonde, simply as getting hold of retrobrite will be a bit of a pain in the UK.

Thanks,

Dave
by dhoggan
Tue Jul 31, 2018 5:16 pm
Forum: general
Topic: Spring Cleaning the Motherboard
Replies: 18
Views: 828

Spring Cleaning the Motherboard

Having just recently picked up a second Beeb Model B - I’ve noticed a couple of commonalities in their condition. The obvious one if that the cases have yellowed over the years and after reading around on *. I see that treatments (retrobrite or Jerome Russell Bblonde seems to give give results), so ...
by dhoggan
Wed Jul 25, 2018 6:53 pm
Forum: hardware
Topic: Troubleshooting the Analogue Port with DB9 Joystick Adapter
Replies: 7
Views: 522

Re: Troubleshooting the Analogue Port with DB9 Joystick Adapter

So the bits I ordered over the weekend turned up today - nylon bolts & nuts and also a few 2-pin headers and jumpers. Now I've removed the wire link that I used to bridge S39 and replaced it with a jumper - the issue with composite output randomly returning to mono may have disappeared - if not it i...
by dhoggan
Sat Jul 21, 2018 4:07 pm
Forum: hardware
Topic: Troubleshooting the Analogue Port with DB9 Joystick Adapter
Replies: 7
Views: 522

Re: Troubleshooting the Analogue Port with DB9 Joystick Adapter

Yes, reading yours and Tricky's posts and watching what happens make sense. I still don't know why joystick 1 showed no change (at least in line with shifting reported values towards the extremes) nor why the fire button was not recognised, but at least I now know what to watch and what the changes ...
by dhoggan
Sat Jul 21, 2018 1:49 pm
Forum: hardware
Topic: Troubleshooting the Analogue Port with DB9 Joystick Adapter
Replies: 7
Views: 522

Re: Troubleshooting the Analogue Port with DB9 Joystick Adapter

Hi Tricky, Ah yes, thanks for the details. I'll need a play to digest that values (and modify the program to AND 0xFFFF the values) but having a look at the connect may have revealed the first big issue in that there are no screws holding the connector to the motherboard and it moves significantly w...
by dhoggan
Sat Jul 21, 2018 12:55 pm
Forum: hardware
Topic: Troubleshooting the Analogue Port with DB9 Joystick Adapter
Replies: 7
Views: 522

Troubleshooting the Analogue Port with DB9 Joystick Adapter

Hi Everyone, I've just returned from a work trip to find Bryce's analogue to DB9 joystick adapter awaiting me. I've plugged it in and a standard Atari joystick, fired up a couple of Acornsoft games and.... nothing :-( The problem is going to be either the joystick, the adapter or the analogue port s...