Search found 4452 matches

by daveejhitchins
Mon Oct 22, 2018 5:49 pm
Forum: hardware
Topic: Restoration of Three Cumana Electron Disc Interfaces
Replies: 7
Views: 454

Re: Restoration of Three Cumana Electron Disc Interfaces

Here's an update of where I am with the schematics. There's still the 2 x EPROM sockets and the RAM to draw-out. I'll get to tyding these up, at some point - but good enough to se what's going on.
IMG_2920.jpg
IMG_2919.jpg
'scuse the not-so-good photos!

Dave H :D
by daveejhitchins
Mon Oct 22, 2018 5:39 pm
Forum: hardware
Topic: Baildon Electronics IDE Interfaces - Replication
Replies: 147
Views: 13654

Re: Baildon Electronics IDE Interfaces - Replication

It's an interesting PCB, but as you sound like you have a breadboard version up and running, won't you have got all the results you need before the PCB turns up? I've just had a message from DHL telling me the boards are on their way :D I only had the bread-board set-up with 2 x 74LS164 - so couldn...
by daveejhitchins
Sun Oct 21, 2018 10:11 pm
Forum: hardware
Topic: Baildon Electronics IDE Interfaces - Replication
Replies: 147
Views: 13654

Re: Baildon Electronics IDE Interfaces - Replication

What percentage of the time is re-ordering the address to shift it out in an odd order? Hmmm! I'm not sending it out in an odd order! Well, if I am, it's not deliberate! I split the address into high-byte mid-byte and low-byte then send to the shift register in low, mid and high byte order. I set-u...
by daveejhitchins
Sun Oct 21, 2018 4:53 pm
Forum: hardware
Topic: Baildon Electronics IDE Interfaces - Replication
Replies: 147
Views: 13654

Re: Baildon Electronics IDE Interfaces - Replication

PCBs ordered for the PLD to 27C020 adaptor. I've also been working on the software to drive this. Currently you can select between BASIC with a display of address and data, BASIC without address and data and I'm now working on a m/c option - need it for speed! Option 1 takes over 5 hours :shock: opt...
by daveejhitchins
Sun Oct 21, 2018 5:52 am
Forum: off-topic
Topic: Cleaning PCBs
Replies: 15
Views: 757

Re: Cleaning PCBs

The old boards havenm't seen 260°C reflow only 225°C. I'm also not sure if really every component can be washed. If you wash them, you also have to dry them carefully Warm, Dry and Time are your friends! Relays could be a problem, however, you can take off the cover after the wash to allow it to dr...
by daveejhitchins
Sat Oct 20, 2018 5:24 am
Forum: introduce yourself
Topic: Hello!
Replies: 11
Views: 282

Re: Hello!

Welcome the the Forum, Dan . . . Enjoy . . .

Hope you manage to get your collection together again - Don't forget the Electron . . .

Dave H :D
by daveejhitchins
Thu Oct 18, 2018 5:16 am
Forum: introduce yourself
Topic: Hi from internetz :)
Replies: 8
Views: 217

Re: Hi from internetz :)

Welcome to the Forum, Drygol . . . Enjoy . . .

We like refurb jobs =D>

Dave H :D
by daveejhitchins
Wed Oct 17, 2018 7:04 pm
Forum: hardware
Topic: Baildon Electronics IDE Interfaces - Replication
Replies: 147
Views: 13654

Re: Baildon Electronics IDE Interfaces - Replication

I'll take one if there is one spare. On the list Ian . . . Seems to be a slightly odd order of address lines out of the shift registers, would be better if you re-ordered to make the shifting out of the value by your program easier. Yes, I know . . . Just copying what I already have working on the ...
by daveejhitchins
Wed Oct 17, 2018 3:16 pm
Forum: hardware
Topic: Baildon Electronics IDE Interfaces - Replication
Replies: 147
Views: 13654

Re: Baildon Electronics IDE Interfaces - Replication

Yes - you just read the PAL as a 27C020 and then pass the "ROM" image to the PA software as a binary file. So that's what I've decided to do. However, instead of trying to read the part on my Programmer (seemingly, may not anyway!) I've put together a quick and dirty adapter that conforms to the re...
by daveejhitchins
Tue Oct 16, 2018 12:08 pm
Forum: introduce yourself
Topic: Hello from down under
Replies: 7
Views: 174

Re: Hello from down under

Welcome to the Forum, Ben . . . Enjoy . . .

Dave H :D
by daveejhitchins
Sun Oct 14, 2018 10:08 pm
Forum: off-topic
Topic: Poor manufacturing
Replies: 9
Views: 416

Re: Poor manufacturing

Contact adhesive or epoxy should fixt that . . .

Dave H :D
by daveejhitchins
Sun Oct 14, 2018 8:58 pm
Forum: introduce yourself
Topic: Hello from Northampton (starting an Acorn System 2/3 refurbishment)
Replies: 19
Views: 446

Re: Hello from Northampton (starting an Acorn System 2/3 refurbishment)

Welcome to the Forum, Chris . . . Enjoy . . .

Good luck with your System x restoration =D>

Dave H :D
by daveejhitchins
Sun Oct 14, 2018 6:53 am
Forum: other vintage computer hardware, software and games
Topic: CRT fungus removal ("cataracts")
Replies: 23
Views: 430

Re: CRT fungus removal ("cataracts")

1024MAK wrote:
Sun Oct 14, 2018 2:07 am
Two things...
It’s not a very good “screen protector” if it can’t even keep mould out...!
I’m disappointed that the big white power button does not light up...

Mark
It's the glue that goes mouldy! But you knew that . . .

Dave H :D
by daveejhitchins
Sun Oct 14, 2018 6:44 am
Forum: archive submissions
Topic: PRES Advanced Plus 2 ROM documentation
Replies: 1
Views: 137

Re: PRES Advanced Plus 2 ROM documentation

Did you know that there's a successor to this? Search for the AP6 and then details about the ROM Utilities.

Dave H :D
by daveejhitchins
Sat Oct 13, 2018 4:54 pm
Forum: for sale / freebies
Topic: Agilent-HP54201A Oscilloscope Excellent Condition
Replies: 26
Views: 2778

Re: Agilent-HP54201A Oscilloscope Excellent Condition

Two thing I miss from my Yokogawa 'scope: Remembering settings over a power-cycle - and the Trigger Marker Not going off screen when the X time base is expanded.

Dave H :D
by daveejhitchins
Sat Oct 13, 2018 8:35 am
Forum: other vintage computer hardware, software and games
Topic: CRT fungus removal ("cataracts")
Replies: 23
Views: 430

Re: CRT fungus removal ("cataracts")

sbadger wrote:
Sat Oct 13, 2018 8:22 am
I was waiting for Dave to say, just put it in the dishwasher....

I'm a bit disappointed! :wink:
Missed opertunaties #-o

Dave H :D
by daveejhitchins
Sat Oct 13, 2018 8:09 am
Forum: other vintage computer hardware, software and games
Topic: CRT fungus removal ("cataracts")
Replies: 23
Views: 430

Re: CRT fungus removal ("cataracts")

Once you’ve managed separate the two pieces, it’s a case of cleaning up and then re gluing them together. I’ve one waiting for me to do, from my Rarther Large , I think, HP68000 (?)

Dave H :D

Edit: I wan’t thinking of using the Dremel on the screen, just the outer casing.
by daveejhitchins
Sat Oct 13, 2018 6:17 am
Forum: other vintage computer hardware, software and games
Topic: CRT fungus removal ("cataracts")
Replies: 23
Views: 430

Re: CRT fungus removal ("cataracts")

I think it’s on with the safety gear and out with the Dremel! After doing the Yoga to steady the hands - maybe have someone with you too!

Dave H :D
by daveejhitchins
Fri Oct 12, 2018 11:37 am
Forum: introduce yourself
Topic: Hello and thanks!
Replies: 8
Views: 208

Re: Hello and thanks!

Welcome to the Forum, Donkeywings . . . Enjoy . . .

Dave H :D
by daveejhitchins
Fri Oct 12, 2018 11:24 am
Forum: hardware
Topic: BBC B repair help
Replies: 27
Views: 827

Re: BBC B repair help

Welcome to the Forum, Derrick . . . Enjoy . . .

Hope you get your B sorted and working!

Dave H :D
by daveejhitchins
Thu Oct 11, 2018 5:56 pm
Forum: hardware
Topic: Baildon Electronics IDE Interfaces - Replication
Replies: 147
Views: 13654

Re: Baildon Electronics IDE Interfaces - Replication

The program isn't mine - it comes from here . It's from his post on reading secured PALs. Ah! Thanks Rob . . . I built the adapter to read the PAL as an EPROM and then used the PA software to analyse the bin/rom file. The software takes the binary "EPROM" dump and generates a text file in CUPL form...
by daveejhitchins
Thu Oct 11, 2018 12:36 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 397
Views: 37077

Re: EEPROM - the Holy Grail of Sideways Rom?

I'm quite surprised nobody has flinched at the fact the outputs from the LS139 on my cart are effectively reversed compared to the schematic. Might be worth making a note somewhere on the cart diagram to confirm which IC socket is enabled by which pin and use accordingly? I'll check the board I hav...
by daveejhitchins
Thu Oct 11, 2018 12:31 pm
Forum: off-topic
Topic: Where do you get your retrocomputing fix?
Replies: 35
Views: 698

Re: Where do you get your retrocomputing fix?

StarDot, ABUG and my workshop

Dave H :D
by daveejhitchins
Thu Oct 11, 2018 10:35 am
Forum: software: other
Topic: ADFS Deleted File Recovery - Assistance Required
Replies: 22
Views: 438

Re: ADFS Deleted File Recovery - Assistance Required

Endnote: Jonathan's 'Recover' program was started at around 13:30, yesterday. It was still running this morning - I was warned! It looks like it searches for Directory entries - sector by sector. Last time I looked it was on sector 9Dxxx :shock: I'll probbly stop this later this morning . . . Is th...
by daveejhitchins
Thu Oct 11, 2018 10:28 am
Forum: hardware
Topic: Baildon Electronics IDE Interfaces - Replication
Replies: 147
Views: 13654

Re: Baildon Electronics IDE Interfaces - Replication

Update (at last) . . . I've now been working on the recovery of the 2 PLDs, on and off, for the last week (Mrs H is away for 2 weeks in November :D :oops: ) and, apart from the lost file shenanigans I seem to be making progress. Although RobC recovered the contents of IC1 (attached) I've decided to ...
by daveejhitchins
Thu Oct 11, 2018 8:33 am
Forum: software: other
Topic: ADFS Deleted File Recovery - Assistance Required
Replies: 22
Views: 438

Re: ADFS Deleted File Recovery - Assistance Required

Well, not exactly . . . As I'd miss remembered the first line, due to changing it for this program - yes, it's an age thing - I had to think of something else unique! Which was " IC1A " - and there it was, just where I'd left it . . . So, file recovered. Many thanks to ALL concerned , especially Jon...
by daveejhitchins
Wed Oct 10, 2018 5:42 pm
Forum: introduce yourself
Topic: Hi from Finland
Replies: 12
Views: 217

Re: Hi from Finland

Welcome to the Forum, Ari . . . Enjoy . . .

Dave H :D
by daveejhitchins
Wed Oct 10, 2018 4:33 pm
Forum: software: other
Topic: ADFS Deleted File Recovery - Assistance Required
Replies: 22
Views: 438

Re: ADFS Deleted File Recovery - Assistance Required

Yes, I had a quick look at Cal.'s recover - options for 40/80 drives only - bit of a clue!

Dave H :D
by daveejhitchins
Wed Oct 10, 2018 11:43 am
Forum: software: other
Topic: ADFS Deleted File Recovery - Assistance Required
Replies: 22
Views: 438

Re: ADFS Deleted File Recovery - Assistance Required

If you've backed up the SD card to your Mac/PC could you just use a hex editor to find the file and reinstate it somehow? I back-up the SD card every week - Usually back-up files I've worked on locally, at the end of every day. That would have been about 5 min. after I deleted the file :? Trying Co...
by daveejhitchins
Wed Oct 10, 2018 10:30 am
Forum: hardware
Topic: AT28C256 SOFT Lock Issues with ARA III & ABR
Replies: 94
Views: 1451

Re: AT28C256 SOFT Lock Issues with ARA III & ABR

I don't expect it to be any different, but it might be worth trying the latest v4.2B version of the EEPxx tools that I posted yesterday. There are some subtle differences between that and the EEP32C version, which was just a quick and dirty patch. I'll try v4.2B ASAP - it may be tomorrow, though, a...