Search found 184 matches

by mga1103
Mon Dec 16, 2013 10:35 am
Forum: hardware
Topic: EPROM Programmer collectors roll call
Replies: 49
Views: 6718

Re: EPROM Programmer collectors roll call

No old stuff I'm afraid, but for the record:

Batronix BX32-II Programmer
Leap Electronics LER-121A Eraser
by mga1103
Sat Dec 14, 2013 3:25 pm
Forum: hardware
Topic: "Good" versus "Bad" Electron Plus 1s
Replies: 159
Views: 12172

Re: "Good" versus "Bad" Electron Plus 1s

... IC1 = 74LS30 IC2 = 74ALS00 IC3 = 74LS139 IC4 = 74LS260 IC5 = 74ALS10 IC6 = 74LS175 IC7 = 74ALS04 IC8 = 74LS27 IC9 = 74ALS20 IC10 = 74ALS00 IC11 = Socketed, ADC0844CCN IC12 = 74LS195 IC13 = 74LS32 IC14 = ROM IC15 = 74LS125 IC16 = 74LS273 ... My evil Plus-1, also an Issue 2, is identical to this ...
by mga1103
Wed Dec 11, 2013 11:32 pm
Forum: hardware
Topic: EEPROM - the Holy Grail of Sideways Rom?
Replies: 373
Views: 35333

Re: EEPROM - the Holy Grail of Sideways Rom?

Nice one Martin! =D>

Good to see you're back in the software development seat again :wink: .
by mga1103
Wed Nov 13, 2013 10:08 pm
Forum: off-topic
Topic: So why that Avatar?
Replies: 49
Views: 2717

Re: So why that Avatar?

Avatar...hmmmm...let's see...love drumming(*)...used to have hair...was once called an Animal on the drums - simples :wink:

Martin A.

*a bit like a lot of my hobbies of late = totally neglected :(
by mga1103
Sat Jan 26, 2013 2:02 pm
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

... Edit: maybe I should add that when I transfered a ROM file from the PC to the Elk, after the transfer completed, it would not show up with *HELP or *UPXROM ?... For what it's worth, I've seen this happen a few times myself (*RLOADing from disk) but after rocking the EUP back and forth (gently!)...
by mga1103
Thu Jan 24, 2013 12:03 am
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

While I haven't tried the mod Martin, it looks like you've nailed it! =D> I'll have a snoop 'round tomorrow for a 74LS00, not sure if I have one to hand, but if so, will give the mod a shot. By the way, is there any way to avoid removing my lovely little toggle switch [JP1], 'cause if I fit the mod,...
by mga1103
Sun Jan 20, 2013 7:29 pm
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

In my case, the only common elements are the Plus-1 and the Peg, as I've been trying 2 Elks (issue 4 & 6), 2 EUP's, different methods of loading roms, Acorn explanation rom and the Slogger expansion rom, so I certainly wouldn't bet on the issue being the Elks...
by mga1103
Sun Jan 20, 2013 6:23 pm
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

Same thing here Martin... Tried it with the pull-up on JP1, added another to pin-20 = same results. Added another to pin-27 (nWE), just to see, left other in place = same results. Also tried removing pull-up from JP1, left other two in place = same results. Each time the results are that "UPXROM ?" ...
by mga1103
Sun Jan 20, 2013 2:12 pm
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

No Paul, in my case the Issue 4 Electron shows the rom slots as being writeable, but on loading a rom image into them and typing *ROMS.... there's nothing there. Strangely, it's my issue 6 that exhibiting this exact behaviour (with Acorn 1.0 Expansion rom), with or without the pull-up (using UPXROM...
by mga1103
Sat Jan 19, 2013 11:47 am
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

Elk #1 - Issue 6 motherboard, UK assembled, non-socketed ULA (black blob :wink:).
Elk #2 - Issue 4 motherboard, HK assembled, socketed ULA.
by mga1103
Fri Jan 18, 2013 11:01 am
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

jms2 wrote:...MartinA have you got a Plus 3?...
Nope, just a Plus-1...
by mga1103
Fri Jan 18, 2013 2:53 am
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

John, just trying to ensure we compare apples with apples... 2) Corruption can occur immediately on loading the rom, you don't need to press break. How are you determining that you've got corruption? Is this based on examining a saved rom image back to disk and checking against a known good image, o...
by mga1103
Thu Jan 17, 2013 12:15 am
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

Damn, this is doing my head in! :evil: Well, the pull-up makes no difference in my setup, as far as I can tell. I mentioned in an earlier post that I was seeing corruption in both banks. Well, I may have been mistaken. When I save the swram contents back to disk and compare to the originals on a lap...
by mga1103
Mon Jan 14, 2013 11:52 pm
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

Well, I tried the cap. No joy - same result. In desperation, I built EUP #2 (yep Martin, found a few more of those batteries I was missing :wink: ) . With the 1st ram chip I tried, it wasn't showing any rom image after an attempted load. It was behaving as though it was write-protected, even though ...
by mga1103
Sun Jan 13, 2013 9:41 pm
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

I'm picking up 4.97v on the EUP (before D3). I haven't changed D3, but I know there's 4.95v going to Vcc (pin 28) on SWRAM. Enough I presume? I've no time to try the electrolytic this evening but will try it tomorrow evening. Is this just a matter of bridging pins 28 (+) & pin 14 (-) ? [Edit: Load w...
by mga1103
Sun Jan 13, 2013 1:43 am
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

No idea here...unless it a problem with my Elk or a Plus-1 thing ? You mentioned you're using a Rombox+, have you tried a Plus-1? (By the way, I've no idea if these do anything differently from each other). If I get a chance tomorrow, I'll try the other Elk. Unfortunately, I've no alternative to my ...
by mga1103
Fri Jan 11, 2013 2:23 am
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

...be advised that if you use SRAM in there, you need to set write protect after loading a rom image and before pressing <Break> to initialise the rom. Apologies for not emphasising this in my earlier post...I thought this was common knowledge (well, except for me #-o) and just glossed over it. Now...
by mga1103
Wed Jan 09, 2013 11:42 pm
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

For anyone utilising SWRAM on their EUP, it might be worthwhile replacing JP1 (the top, WPROT link) with a small right-angled toggle switch. EUP Toggle.JPG After you load a ram bank with a rom image, you will need to move JP1 from East to West to write-protect the newly loaded image (and before hitt...
by mga1103
Tue Nov 27, 2012 11:01 pm
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

... (There are a couple travelling to the Emerald Isle, Ballypinball or something like, and these always take longer because the donkeys need regular hay-breaks.) ... :D ...I'm sure there's a smart-ass answer lingering somewhere, but I'm just too fecked to wait for something sensible to emerge my m...
by mga1103
Thu Jun 14, 2012 11:44 pm
Forum: introduce yourself
Topic: Hi all
Replies: 11
Views: 1346

Re: Hi all

MartinB wrote:...It probably failed because you typed "on" instead of "no" :wink:
(Well Paul, I guess there's on no answer to that, eh?! :twisted:
by mga1103
Sat Jun 09, 2012 11:46 pm
Forum: hardware
Topic: Electron User Port & Rom/Ram board
Replies: 536
Views: 63229

Re: Electron User Port & Rom/Ram board

It's great to see this make it to the wider audience. A really fantastic piece of work, and of course, your detailed posts are as informative as ever. Well done, Sir! =D> Roll on the PCB's...(...I'm probably stating the obvious here, but put me down for one two units!) Thanks again for your huge eff...
by mga1103
Fri Apr 20, 2012 1:24 am
Forum: hardware
Topic: Making your own ROMs
Replies: 57
Views: 8390

Re: Making your own ROMs

I'd also vouch for the Batronix programmer! [Personally, I didn't find Farnell the cheapest around. In fact, I bought from Batronix directly. Prices might be different in the UK though, so go for whatever works best for you...]. Another selling point for these guys is their Customer Service. It's to...
by mga1103
Mon Apr 16, 2012 10:12 pm
Forum: introduce yourself
Topic: Return of Acorn
Replies: 35
Views: 3805

Re: Return of Acorn

Welcome Alastair! Can I ask if you've got any affiliation with the BBC and what your intended target audience is for your product(s)? Speaking of 'products', I'm still not clear if we're talking hardware, software, or perhaps both! Maybe a little clarification, without giving away the crown jewels, ...
by mga1103
Wed Apr 11, 2012 2:05 am
Forum: archive submissions
Topic: Any interest?
Replies: 74
Views: 12746

Re: Any interest?

ADE library A4080 LIBRARY SYSLIB T.LIBRARY T.SYSLIB I actually bought the ADE Assembler ROM at some point, but ended up using the Lancs assembler (indeed, that's a burnt EPROM in my machine). This is the disk that came with the ROM Well Stephen, it's not too often that ADE and Lancs gets mentioned ...
by mga1103
Wed Mar 28, 2012 1:57 pm
Forum: for sale / freebies
Topic: Big list of stuff for sale!
Replies: 20
Views: 3224

Re: Big list of stuff for sale!

Lee,
Books arrived safe and sound, thanks to being well packaged! They look like they've never been opened! =D>. Now I just need to find the time to open them myself :roll: .

Thanks again!
Martin.
by mga1103
Fri Mar 23, 2012 7:54 am
Forum: coordination of magazine scanning projects
Topic: BeebUG Magazines
Replies: 56
Views: 8983

Re: BeebUG Magazines

Where small updates are made (e.g. re-scanning or adding one or two issues to a volume), would it be possible to upload the changes separately also? Don't get me wrong, I'm not complaining, this is great work you're doing and I enjoy these mags, and I actually prefer to download the full issues in o...
by mga1103
Wed Mar 21, 2012 3:53 pm
Forum: wanted
Topic: Wanted: ROMBOX+
Replies: 4
Views: 648

Re: Wanted: ROMBOX+

Yep, for the Elk. Thanks for taking the time post the link anyways! :wink:
by mga1103
Tue Mar 20, 2012 9:19 am
Forum: wanted
Topic: Wanted: ROMBOX+
Replies: 4
Views: 648

Wanted: ROMBOX+

Anyone with a spare ROMBOX+ that you're looking to offload? Drop me a PM with its condition and cost... :wink:

Thanks,
Martin.
by mga1103
Fri Mar 16, 2012 12:56 am
Forum: off-topic
Topic: Wasn't expecting that!
Replies: 37
Views: 3823

Re: Wasn't expecting that!

...but then I suppose, you wouldn't have a leg to stand on...
by mga1103
Fri Mar 16, 2012 12:49 am
Forum: off-topic
Topic: Wasn't expecting that!
Replies: 37
Views: 3823

Re: Wasn't expecting that!

Well in that case Alex, especially given the total lack of sympathy in this thread, I think it's time you simply put your foot down...