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by 1024MAK
Sun Jan 21, 2018 11:59 am
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

Phil, you must have looked during the time I was correcting the picture from the Australian version! :lol:

Mark
by 1024MAK
Sun Jan 21, 2018 11:17 am
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

Here is a close up of Robert's single board 6502 system:
IMG_6390.JPG


Daniel upgrading a Master:
IMG_6387.JPG

Still plenty going on:
IMG_6386.JPG

IMG_6389.JPG

IMG_6388.JPG

Mark
by 1024MAK
Sat Jan 20, 2018 11:22 pm
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

Thanks for the photos! I recognise Steve Furber but who else do we see? And what's that single board Beeb with SCART output? And is that a very special cheese wedge? As Phil says, Steve signed one of the manuals for it (Ian / BeebMaster took a photo of the signatures in the manual, but I did not). ...
by 1024MAK
Sat Jan 20, 2018 11:39 am
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

More photos, including a small number featuring our special guests :D IMG_6314.JPG IMG_6315.JPG IMG_6316.JPG IMG_6317.JPG IMG_6318.JPG IMG_6319.JPG IMG_6320.JPG IMG_6321.JPG IMG_6322.JPG IMG_6323.JPG IMG_6324.JPG IMG_6325.JPG IMG_6326.JPG IMG_6328.JPG IMG_6329.JPG IMG_6330.JPG IMG_6331.JPG IMG_6332....
by 1024MAK
Fri Jan 19, 2018 11:59 pm
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

danielj wrote:Do we have hot air in there? Do I need to bring the hot air? Will bring eprom programmer.

d.


Err, maybe super glue... and hot air...

Mark
by 1024MAK
Fri Jan 19, 2018 10:52 pm
Forum: upcoming and recent events & exhibitions
Topic: RISC OS SouthWest Show 2018 - Saturday 24th February, 2018
Replies: 1
Views: 68

RISC OS SouthWest Show 2018 - Saturday 24th February, 2018

RISC OS SouthWest Show 2018 - Saturday 24th February, 2018

Image

Web site http://www.riscos-swshow.co.uk
by 1024MAK
Fri Jan 19, 2018 10:04 pm
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

Some photos...

IMG_6232.JPG
Roland, Kees, Phil, Phill, Matthew and Bryan with Ian hiding behind!

IMG_6233.JPG
Recreated System computer by Prime (Phill)

IMG_6230.JPG
Dave's workstation

IMG_6231.JPG
Guess who's pile this is...

IMG_6229.JPG
Matthew's table

IMG_6228.JPG
A small table of refreshments and snacks...

IMG_6227.JPG
And another :-)

Mark
by 1024MAK
Fri Jan 19, 2018 9:52 pm
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

danielj wrote:I'll be joining you all bright and early :) Let me know if there's any bits and bobs needed! :)

d.

Ian has requested some help with repairs... so bring your entire workshop!

Mark
by 1024MAK
Fri Jan 19, 2018 7:07 pm
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

Arcadian wrote:Everybody else in the Bridgewater! :)

Yes, currently plenty of room, just three of us so far...

Mark
by 1024MAK
Fri Jan 19, 2018 3:42 pm
Forum: hardware
Topic: Large project box
Replies: 5
Views: 244

Re: Large project box

If you want a plastic rectangular box with a flat top, search for 19 inch rack plastic boxes.

E.g. On eBay "Black 19 Inch ABS Plastic Rack Mount Case Box Enclosure"

Mark
by 1024MAK
Thu Jan 18, 2018 10:40 pm
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

Why can you never find what you want when your time is limited... :shock: :(

Mark
by 1024MAK
Thu Jan 18, 2018 9:47 pm
Forum: other vintage computer hardware, software and games
Topic: Reading EPROMS
Replies: 10
Views: 272

Re: Reading EPROMS

/OE (negative logic output enable) turns on the three state drives on the output pins, while /CE or /CS (negative logic chip enable or chip select) brings it out of "standby" mode and tells it to read it's memory. So normally /CE or /CS is connected to address decoder logic and /OE is conn...
by 1024MAK
Thu Jan 18, 2018 4:08 pm
Forum: other vintage computer hardware, software and games
Topic: Reading EPROMS
Replies: 10
Views: 272

Re: Reading EPROMS

The data area of an EPROM is actually analog. Comparators actually decide if each memory cell is a zero or a one based on the voltage from the cell. The rest of the circuitry is either NMOS or CMOS logic circuits, with the CPU interface designed to be compatible with 5V TTL logic (for the smaller/ol...
by 1024MAK
Thu Jan 18, 2018 3:54 pm
Forum: other vintage computer hardware, software and games
Topic: Reading EPROMS
Replies: 10
Views: 272

Re: Reading EPROMS

You may find that it works with a 3.3V supply voltage (well, for reading, not recommended for programming). Unless the original programming was marginal (in which case some cells may return incorrect data). It may also not meet the datasheet timing values.

Mark
by 1024MAK
Wed Jan 17, 2018 8:14 pm
Forum: hardware
Topic: Newbie question regarding first machine
Replies: 16
Views: 444

Re: Newbie question regarding first machine

The Master series were Acorn's last 8 bit machines, in the same way that Amstrad's Sinclair +2B/+3B were the last of the Sinclair Spectrum range. Although the Model B is more advanced than a Sinclair Spectrum+ in many ways, the Spectrum has the advantage of more RAM and a display system that is more...
by 1024MAK
Tue Jan 16, 2018 11:42 pm
Forum: off-topic
Topic: Decoupling capacitor for ic
Replies: 11
Views: 307

Re: Decoupling capacitor for ic

Y'know, I've recently seen on eBay a set of dip sockets with I integrated capacitors. Can't remember much about 'em but I thought they looked quite novel. They've been around for many years. But in the past, unless I was very tight on space, I've found it's much cheaper to use a normal DIP/DIL sock...
by 1024MAK
Tue Jan 16, 2018 10:47 am
Forum: hardware
Topic: BBC B Running slow
Replies: 11
Views: 471

Re: BBC B Running slow

There is also the possibility that there is a strange fault with the circuitry that selects between 2MHz and 1MHz for the CPU clock.

Do you have an oscilloscope, or are you able to borrow one?

Mark
by 1024MAK
Mon Jan 15, 2018 4:09 pm
Forum: off-topic
Topic: How many people found computer self-assembly annoying?
Replies: 10
Views: 355

Re: How many people found computer self-assembly annoying?

I think there are a number of things to consider here. Speaking from a perspective of being in the U.K., here are my thoughts. It could well be a different story elsewhere in the world. The computer kits were initially mainly aimed at the electronic hobbyists. Various electronics and radio enthusias...
by 1024MAK
Sun Jan 14, 2018 8:26 pm
Forum: hardware
Topic: Which replacement parts are available new?
Replies: 5
Views: 280

Re: Which replacement parts are available new?

6522 CMOS versions are indeed still being manufactured. As are various Z80 support chips. It's highly unlikely that any of the older display controller, sound chips or floppy disk controller chips are still being made. As there is significant no market for them. Most 74 series logic is still availab...
by 1024MAK
Fri Jan 12, 2018 2:11 pm
Forum: off-topic
Topic: Decoupling capacitor for ic
Replies: 11
Views: 307

Re: Decoupling capacitor for ic

There is lots of information on decoupling capacitors in this thread and further on, here . In general, a 100nF capacitor is used. But the value is not critical in most cases. So a 47nF or 220nF capacitor may well be okay. Manufacturers can sometimes use smaller values, as they can either use wider ...
by 1024MAK
Fri Jan 12, 2018 12:58 am
Forum: off-topic
Topic: Internet of Strings
Replies: 8
Views: 280

Re: Internet of Strings

It's amazing what types of electrical signal you can actually send over a relatively short section of poor quality cable... (and for AC communication signals, a wet salty "conductor" for 2 metres is equivalent to a "poor quality cable"). It's been known for a weak, but usable sig...
by 1024MAK
Thu Jan 11, 2018 9:46 pm
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

On the Friday , numbers gradually fall during the afternoon. Leaving very diminished numbers after 16:30. Mark From the intro text, on Friday , we have the room from 5pm. Sunday, people start to drift away from about lunch time. Sorry, brain fart :oops: #-o [-X :lol: I was indeed thinking of Sunday...
by 1024MAK
Thu Jan 11, 2018 7:14 pm
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

On the Friday, numbers gradually fall during the afternoon. Leaving very diminished numbers after 16:30.

Mark
by 1024MAK
Wed Jan 10, 2018 10:56 pm
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 115
Views: 4183

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

I once came across a 8 bit computer where someone had glued a broken connector back on :shock:. Never mind about these bits of broken and unjointed metal pins... Unsurprisingly, anything plugged into said connector did not work :lol: As the connector was obsolete, I had to get a spare from a shop th...
by 1024MAK
Wed Jan 10, 2018 5:03 pm
Forum: hardware
Topic: Electron cassette counter revolution rate
Replies: 26
Views: 583

Re: Electron cassette counter revolution rate

Not with the same motor as driving the capstan as there is no single gear ratio between the captan and the take-up spool that would work, hence the slipping clutch. I guess so. Though I think only very early decks relied on a single motor. I came to the party rather later. If tape recorders/players...
by 1024MAK
Wed Jan 10, 2018 1:42 pm
Forum: hardware
Topic: Electron cassette counter revolution rate
Replies: 26
Views: 583

Re: Electron cassette counter revolution rate

the missing piece of the puzzle is that the take up spool has a clutch, often comprising a spring and a piece of felt, that enables it to slow down as the circumference of the tape wound into that spool becomes greater I thought cheap decks just used a motor with low enough torque not to stretch th...
by 1024MAK
Sun Jan 07, 2018 3:49 pm
Forum: hardware
Topic: Broken Beeb - strange memory issue, what to try next?
Replies: 12
Views: 565

Re: Broken Beeb - strange memory issue, what to try next?

Well, there goes the Beeb's build reputation :lol:

Well done =D>

Poor connections can cause all manner of hard to trace weird and not so wonderful fault symptoms :twisted:

Mark
by 1024MAK
Sat Jan 06, 2018 6:24 pm
Forum: hardware
Topic: Floppy switch configs
Replies: 41
Views: 712

Re: Floppy switch configs

Don't enter extra spaces... and check any separators are correct.

Mark
by 1024MAK
Sat Jan 06, 2018 6:18 pm
Forum: hardware
Topic: Floppy switch configs
Replies: 41
Views: 712

Re: Floppy switch configs

Post above edited.

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