Search found 53 matches

by skagon
Mon Dec 02, 2013 12:33 am
Forum: Hardware
Topic: Gold Card ROM Shadowing
Replies: 4
Views: 3233

Re: Gold Card ROM Shadowing

I suppose we *could* do a Gold Card ROM disassembly and see what the hell it's doing on system boot; i.e. which addresses it's copying where and which patches it's applying to them.
It's still 68k machine code... is it worth the trouble, though?
by skagon
Wed Nov 13, 2013 1:22 am
Forum: Hardware
Topic: RAM problem on faulty QL
Replies: 7
Views: 5175

Re: RAM problem on faulty QL

If anyone's even following the thread, news flash. So... like I said, I got my el-cheapo soldering iron and braid, and replaced the old TI 74LS257 with a nice... socket. Then I got one of the NOS Signetics 257s that I got here and here's the result: 74LS257 in socket.jpg So, after the foreplay was o...
by skagon
Sat Nov 09, 2013 2:39 am
Forum: Hardware
Topic: RAM problem on faulty QL
Replies: 7
Views: 5175

Re: RAM problem on faulty QL

Funny you should ask; all this time, while waiting for some chips and sockets to arrive, I wrote a test programme and checked my assumptions. You see, my previous conclusions were drawn thinking in "PC" mode, not in "QL" mode. So I hadn't taken into account how the pixels are sto...
by skagon
Sat Nov 09, 2013 2:17 am
Forum: Hardware
Topic: SD cards with Qubide
Replies: 19
Views: 9897

Re: SD cards with Qubide

First order of business: believe it or not, there are square hole drill bits. Check this out: rjckF0-VeGI But for us who don't have access to industrial gear, a dremmel, a plain drill and some files are all that's needed. Oh, yeah, and a triangle and a pencil and lots of patience. About the HxC, I'v...
by skagon
Thu Oct 31, 2013 11:56 am
Forum: Hardware
Topic: Super Gold Cards - unrecognised ROM
Replies: 7
Views: 4998

Re: Super Gold Cards - unrecognised ROM

He is already selling a SuperGold Card.
If I understand correctly, there are two fully working and one sort-of working in total.
First one, £245.
by skagon
Wed Oct 30, 2013 12:36 am
Forum: Hardware
Topic: Super Gold Cards - unrecognised ROM
Replies: 7
Views: 4998

Re: Super Gold Cards - unrecognised ROM

I guess you'd have to compare the ROMs of the Gold or SuperGold cards as well as the ROMs of the QLs. For the QLs I mean, binary comparison. I don't know if it's known to have happened, ROMs with the same version but slightly different code? Also I know, the JM ROMs weren't exactly new, but maybe, j...
by skagon
Mon Oct 28, 2013 5:36 pm
Forum: Hardware
Topic: Service Manual and Schematics
Replies: 12
Views: 9376

Re: Service Manual and Schematics

Expanding on this (thanks Mark) I was wondering if there's any definitive list of board mods that can or should be done as general practice. For example, look at the last paragraph of this link here : Try the 'bombproofing' mods listed in QL World in Nov 89 - but I think this is a bit of an overkill...
by skagon
Mon Oct 28, 2013 4:52 pm
Forum: Wanted
Topic: Reset button
Replies: 19
Views: 11469

Re: Reset button

Mark, I've got a service manual right here. Printed, that is. Unfortunately, no scanner, but I doubt it'd be of much use as the schematic pages are bigger than A3. Anyway, I know what the Reset button connects to and I've got a momentary switch hooked, I just don't like the idea of a dangling switch...
by skagon
Sun Oct 27, 2013 8:28 pm
Forum: Wanted
Topic: Reset button
Replies: 19
Views: 11469

Re: Reset button

1024MAK wrote:...I did not think that it was easily removable/replaceable.
The only thing I can safely say it is, is easily breakable... :P
by skagon
Sun Oct 27, 2013 7:40 pm
Forum: For Sale
Topic: SOLD Jurgen Falkenberg Keyboard Interfaces
Replies: 65
Views: 29010

Re: SOLD Jurgen Falkenberg Keyboard Interfaces

If you want to be just an end user, then decide if the price of something is what you can afford and buy it or not.. If it's over priced then don't buy it and watch out for another on the market at a lower price.. It is rare I ever buy anything on ebay... If any one comes at a lower price, I'm sure...