Search found 3050 matches

by retroclinic
Mon Sep 14, 2020 10:06 am
Forum: 8-bit acorn hardware
Topic: BBC micro Watford Electronics DDFS support chips
Replies: 10
Views: 3030

Re: BBC micro Watford Electronics DDFS support chips

No, it's for the clock, which the DDB2 has onboard.
by retroclinic
Wed Aug 05, 2020 3:50 pm
Forum: 8-bit acorn hardware
Topic: Non-working floppy drive
Replies: 12
Views: 467

Re: Non-working floppy drive

..as for cap replacement, on a motherboard generally I agree, if it ain't broke, don't try and fix it, but for Power supplies, especailly the Model B ones, it's a MUST. This PSU and it's caps looked perfect from the top, it was only on dismantling....
IMG_4645.jpg
by retroclinic
Wed Aug 05, 2020 3:46 pm
Forum: 8-bit acorn hardware
Topic: Non-working floppy drive
Replies: 12
Views: 467

Re: Non-working floppy drive

What FDC do you have? If it's a 1772, then no speed setting will be slow enough for that drive.

Thanks, Mark.
by retroclinic
Fri Jul 24, 2020 12:37 pm
Forum: 8-bit acorn hardware
Topic: Problems with newly acquired BBC Micro
Replies: 22
Views: 796

Re: Problems with newly acquired BBC Micro

The W65C22S VIA is definitely not compatible, but other 6522 or 65C22 chips may work okay I've been playing with the new ones. The W65C22N works, but seems to give spurious IRQs from the keyboard when keys are pressed or the options switches are set. I need to play more and find out if this can be ...
by retroclinic
Fri Jul 24, 2020 10:00 am
Forum: 8-bit acorn hardware
Topic: Problems with newly acquired BBC Micro
Replies: 22
Views: 796

Re: Problems with newly acquired BBC Micro

....Only the System VIA (IC3) is needed for the OS to boot happily.... Just to point out that the OS will boot without either VIA being present. Of course the keyboard and sound won't work, but removing both (along with the ADC, Serial ULA, 6850 if it's socketd, and all ROMs apart from the OS) is a...
by retroclinic
Tue May 12, 2020 6:29 pm
Forum: 8-bit acorn hardware
Topic: SOLVED:Issues with my bbc b
Replies: 31
Views: 1443

Re: Issues with my bbc b

What brand of TV are you using? Also, I've not seen how the ones from that seller are wired, and they're not all wired the same, and with the same value components to give the correct voltage reduction. Can you remove the SCART plug plastic end and do a close up photo of it, to see if the components...
by retroclinic
Wed May 06, 2020 10:47 am
Forum: 8-bit acorn hardware
Topic: SOLVED:Issues with my bbc b
Replies: 31
Views: 1443

Re: Issues with my bbc b

Thanks, replied to this by eMail.
by retroclinic
Thu Apr 23, 2020 9:53 am
Forum: general
Topic: Today I received.....
Replies: 5956
Views: 586103

Re: Today I received.....

There are a number of different key types, so you need the right one : http://www.cjemicros.co.uk/micros/individual/newprodpages/prodinfo.php?prodcode=ACO-MASTERKSW http://www.cjemicros.co.uk/micros/individual/newprodpages/prodinfo.php?prodcode=ACO-MASTERKT-A Yes, I've got all those, and at less th...
by retroclinic
Thu Feb 20, 2020 6:07 pm
Forum: for sale / freebies
Topic: BeebZIF kits now available
Replies: 20
Views: 2847

Re: BeebZIF kits now available

None left at the moment, sorry. I may make another round of these in qa few months, as there has been more interest. Thanks.
by retroclinic
Thu Feb 20, 2020 12:49 pm
Forum: for sale / freebies
Topic: BeebZIF kits now available
Replies: 20
Views: 2847

Re: BeebZIF kits now available

Hi. I'm not familiar with that board, so yes try it in an original socket. I presume you're powering off the machine, fitting the ROM you want, then turning it back on again, and not fitting the rom with the power turned on?

Thanks, Mark.
by retroclinic
Wed Oct 02, 2019 7:46 am
Forum: 8-bit acorn hardware
Topic: Fixed: Mode 7 intermittent lines
Replies: 46
Views: 2887

Re: Fixed: Mode 7 intermittent lines

The Master has a different SYNC output, it doesn’t blank the h during the v period, it inverts it, so it could be that difference making the Master more stable?

Disclaimer - this is from memory as I’m waking up, so I reserve the right to correct myself! :lol: :lol:
by retroclinic
Thu Sep 12, 2019 4:50 pm
Forum: 8-bit acorn hardware
Topic: Fixed: Mode 7 intermittent lines
Replies: 46
Views: 2887

Re: Fixed: Mode 7 intermittent lines

Thanks for the info. I'm guessing you tried the RS 146-3926 . Given that I don't need that quantity, I've just ordered up a pack of 10 RS 814-9440 for £1.70 (including VAT & postage). Ony real difference I can see between the two is load capacitance, and frequency tolerance / stability. Assuming th...
by retroclinic
Thu Sep 12, 2019 4:21 pm
Forum: 8-bit acorn hardware
Topic: Fixed: Mode 7 intermittent lines
Replies: 46
Views: 2887

Re: Fixed: Mode 7 intermittent lines

However, as everything original in Beebs are now 30-35 years old, I will replace them from now on for the sake of 30p. Out of interest what crystal will you be using? Have you tried any of the HC-49US (I assume the S stands for small) package devices in place of the original HC-49U? The US package ...
by retroclinic
Thu Sep 12, 2019 2:13 pm
Forum: 8-bit acorn hardware
Topic: Fixed: Mode 7 intermittent lines
Replies: 46
Views: 2887

Re: Fixed: Mode 7 intermittent lines

Ok, been doing some testing on this today. I've tried several different new 16MHz crystals from different manufacturers in place of existing original crystals that were causing the re-sync issue on the converter, and any of the new type I've tried have been fine, and they've all been 30ppm. I've had...
by retroclinic
Wed Sep 11, 2019 10:13 am
Forum: 8-bit acorn hardware
Topic: Fixed: Mode 7 intermittent lines
Replies: 46
Views: 2887

Re: Fixed: Mode 7 intermittent lines

Interesting read, as I've also had jumping from several beebs using these ElCheapo converters. The 16MHz crystal you used, I looked at the eBay ad, but it doesn't mention the tolerance. Closest I can find in an HC49 case is 30ppm, I'm presuming this will be a more accurate version than that original...
by retroclinic
Mon Jul 08, 2019 9:31 am
Forum: for sale / freebies
Topic: BeebZIF kits now available
Replies: 20
Views: 2847

Re: BeebZIF kits now available

Still no forum PM, but I've just replied to your Facebook message. Thanks.
by retroclinic
Sun Jul 07, 2019 7:48 pm
Forum: for sale / freebies
Topic: BeebZIF kits now available
Replies: 20
Views: 2847

Re: BeebZIF kits now available

Hi, not seen a PM from you as yet, you can always email me, or contact me through my Facebook page of the same name. Thanks.
by retroclinic
Sun Jul 07, 2019 2:12 pm
Forum: for sale / freebies
Topic: BeebZIF kits now available
Replies: 20
Views: 2847

Re: BeebZIF kits now available

I've got 2 kits left, so if anyone else wants one, send me a PM! They are £30.00 plus postage.

Thanks, Mark.
by retroclinic
Sun Jul 07, 2019 9:19 am
Forum: for sale / freebies
Topic: BeebZIF kits now available
Replies: 20
Views: 2847

Re: BeebZIF kits now available

Yes I do still have a few left. Send me an eMail or PM and I'll sort you one out. Thanks.
by retroclinic
Wed Mar 13, 2019 4:56 pm
Forum: 8-bit acorn hardware
Topic: Master audio noise
Replies: 13
Views: 932

Re: Master audio noise

Hehe yes, that previous advice was from 2013, and is sort of a "hack" to reduce the HF noise passed to the LM386. Replacing the 3x Tant caps in that area, plus the LM324 seems to work in getting rid of 90% of the noise in most Masters. If it's still noisy, then change the LM386 amp as well. Thanks, ...
by retroclinic
Thu Sep 13, 2018 10:52 am
Forum: past physical ABug events
Topic: ABUG EAST MIDLANDS (Leicester) 9-11 November 2018 - BOOKING NOW on THIS THREAD
Replies: 117
Views: 12595

Re: ABUG EAST MIDLANDS (Leicester) 9-11 November 2018 - BOOKING NOW on THIS THREAD

Pop me down for a walk in, probably just the Sunday.

If anyone wants spares / goodies etc. bringing along to save postage, please PM me here, or email / Facebook etc.

Thanks!
by retroclinic
Thu Aug 30, 2018 12:10 pm
Forum: for sale / freebies
Topic: STH members eBay advice - buying & selling!
Replies: 39
Views: 21480

Re: STH members eBay advice - buying & selling!

Problem is, for years now, buyers CANNOT get negative feedback, only sellers. So a buyer can mess you about, and the sellers can't do jack about it. They can report the buyer, but eBay really gives very little if any toss as long as they're making their $$$.
by retroclinic
Mon Aug 27, 2018 3:44 pm
Forum: 8-bit acorn hardware
Topic: Gotek / Disk Problem ?
Replies: 29
Views: 2027

Re: Gotek / Disk Problem ?

Hi.

Glad you got it sorted in the end. I'm now shipping them with that option set as default in the config file, as 1770 DFSs don't seem to care if it's on or off, it's only 8271s that are fussy.

Thanks, Mark.
by retroclinic
Mon Aug 27, 2018 8:03 am
Forum: 8-bit acorn hardware
Topic: Gotek / Disk Problem ?
Replies: 29
Views: 2027

Re: Gotek / Disk Problem ?

Hi.

Great you got it working, but did you read the leaflet that came with it? This exact issue and the fix is mentioned in it.

Thanks, Mark.
by retroclinic
Mon May 07, 2018 11:55 pm
Forum: 8-bit acorn hardware
Topic: Case screws available anywhere?
Replies: 18
Views: 3899

Re: Case screws available anywhere?

Hi, yes I've got case screws, but the Beeb ones aren't identical, in that they're not black and have a standard screw head. They fit perfect though and are the same thread pitch! The Master ones I have are identical to the originals.

Thanks, Mark.
by retroclinic
Fri Dec 29, 2017 7:41 pm
Forum: 8-bit acorn hardware
Topic: Compatible DRAMS for BBC B
Replies: 14
Views: 3206

Re: Compatible DRAMS for BBC B

I've got DRAM in stock for all BBC Micro types, and others, including 4816 and 4164.

Thanks, Mark.
by retroclinic
Fri Dec 08, 2017 9:34 am
Forum: 8-bit acorn hardware
Topic: Problem Beeb MotherBoard
Replies: 69
Views: 5474

Re: Problem Beeb MotherBoard

I've read through the thread, but can't really follow where you are. You don't need a keyboard connected at all to get it to boot, just remove the System VIA - infact, to get an initial boot, remove both VIAs, 7002, Serial ULA, 6850 if socketed (worth removing it anyway if boot problems as they can ...
by retroclinic
Sun Sep 24, 2017 3:41 pm
Forum: past physical ABug events
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 139
Views: 20022

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

Hi.

Confirming I'll come on the Sunday, but I'll probably be with no kit - unless anyone wants anything in particular.

Thanks, Mark.
by retroclinic
Tue Aug 01, 2017 11:02 am
Forum: 8-bit acorn software: other
Topic: Datacentre Copy ADFS Disc to USB Question
Replies: 42
Views: 7840

Re: Datacentre Copy ADFS Disc to USB Question

Basic programs on JGHs site are usually just BBC Tokenised BASIC, so drag it to the USB Stick, rename it 7 characters with no file extension, then just LOAD it from drive 5 on the DataCentre in BASIC.

Thanks, Mark.
by retroclinic
Wed Jul 26, 2017 4:57 pm
Forum: 8-bit acorn software: other
Topic: Datacentre Copy ADFS Disc to USB Question
Replies: 42
Views: 7840

Re: Datacentre Copy ADFS Disc to USB Question

,,,,,,The USB "drive" in the DataCentre is only visible to *CAT, *EXPORT and *IMPORT, it doesn't work as a filing system Erm..yes it does, in part.... so you can't save/load to it. Yes you can. It supports the OS calls that allow SAVE and LOAD, both as BASIC and *SAVE *LOAD etc. The only thing it d...

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