Search found 457 matches

by 1024MAK
Sat Mar 25, 2017 7:18 pm
Forum: General QL Chat
Topic: ZX-TEAM Meeting 2017 Mahlerts, Germany
Replies: 7
Views: 577

Re: ZX-TEAM Meeting 2017 Mahlerts, Germany

Wave (very slowly) at the webcam :lol:

Mark
by 1024MAK
Sat Jan 21, 2017 1:22 pm
Forum: Hardware
Topic: ULA ZX8301 - TV Picture Capabilities
Replies: 29
Views: 2188

Re: ULA ZX8301 - TV Picture Capabilities

A GAL used to replace the existing HAL would not be capable of the complex logic required to add extra colours like you suggest :-( Really, to add extra colours, the ZX8301 needs to be replaced. You could piggy back a CPLD or a FPGA on an adaptor PCB above the ZX8301 to add extra colours and functio...
by 1024MAK
Sat Jan 21, 2017 1:13 pm
Forum: Hardware
Topic: TrumpCard modification
Replies: 18
Views: 1311

Re: TrumpCard modification

There are various switching regulator replacements, in various ratings...

Here in this thread are two different ones used on ZX81 boards: Pictures of my ZX81 fitted with a RECOM 5V Regulator

Mark
by 1024MAK
Mon Jan 09, 2017 2:06 pm
Forum: Hardware
Topic: TrumpCard modification
Replies: 18
Views: 1311

Re: TrumpCard modification

Yep, series pass regulators like the 7805, 7809, 7812, 7905, 7912 etc will waste power. At any given current within their operating range, the power dissipated as heat is appropriately the difference between the input and output voltages multiplied by the current. But in the 1980's and early 1990's,...
by 1024MAK
Sun Jan 01, 2017 1:08 pm
Forum: The Off-Topic Section
Topic: Happy QL Year
Replies: 3
Views: 390

Re: Happy QL Year

Your new Happy New Year postcard will be sent out, Expected delivery in 28 days! :lol:

Mark
by 1024MAK
Fri Dec 30, 2016 11:16 pm
Forum: General QL Chat
Topic: Happy Christmas to all our members!
Replies: 12
Views: 921

Re: Happy Christmas to all our members!

:D :D :D :D :D

Mark
by 1024MAK
Fri Dec 30, 2016 8:20 pm
Forum: General QL Chat
Topic: Happy Christmas to all our members!
Replies: 12
Views: 921

Re: Happy Christmas to all our members!

Well I never, it's a tad early to take down the forum festive decorations.... :(

It's not even the New Year yet :shock:

Re-boot the drive with the festive QL Forum banner please ;)

At least until 23:59 on January 2nd.

Mark
by 1024MAK
Thu Dec 29, 2016 1:40 am
Forum: Hardware
Topic: TrumpCard modification
Replies: 18
Views: 1311

Re: TrumpCard modification

The cards before TC2 are not all perfectly identical since underwent some revisions. Let's hope some of the expert could notice if in this case some revision is recommended or not I don't know what, if any revisions occurred. But the main way of reducing power usage and therefore power dissipation,...
by 1024MAK
Thu Dec 29, 2016 1:33 am
Forum: Hardware
Topic: TrumpCard modification
Replies: 18
Views: 1311

Re: TrumpCard modification

Yes, but the RAM chips are really 4 bit ones. There's a circuit diagram in the same directory (http://gigant.chem.elte.hu/ZXSpectrum/QL_Trump_Card/) where the picture resides and that clearly shows each chip has 4 data lines. That still makes 1 megabit, so I am a little confused what you mean! Yes ...
by 1024MAK
Sun Dec 25, 2016 11:15 pm
Forum: General QL Chat
Topic: Happy Christmas to all our members!
Replies: 12
Views: 921

Re: Happy Christmas to all our members!

NormanDunbar wrote:And a Merry Christmas to all our moderators and administrators too.
Thanks for all the hard work.

Agreed :D

Mark

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