Search found 566 matches

by 1024MAK
Tue Apr 21, 2020 11:04 pm
Forum: Prospective Members
Topic: Is QUANTA stil alive / accepting members?
Replies: 13
Views: 1038

Re: Is QUANTA stil alive / accepting members?

@Pr0f, whereabouts dif you find the sign up page ? I was just thinking over the weekend that I should rejoin (having been an on-off member over the years, mainly because I kept forgetting to renew!). Do I just use the Contact Us page? Also, it says tht membership is free - is that correct? I had no...
by 1024MAK
Tue Apr 21, 2020 11:00 pm
Forum: Prospective Members
Topic: Is QUANTA stil alive / accepting members?
Replies: 13
Views: 1038

Re: Is QUANTA stil alive / accepting members?

Derek_Stewart wrote:Hi,

Just received Quanta eMag, Volume 36 Issue 5

The title says Dec-Jan 2019, must be a typo...

Aye, I had to double check the post stamp as at first I though last years had taken 12 months to find its way to my home...

I think it should have said Dec 2019 - Jan 2020.

Mark
by 1024MAK
Tue Apr 21, 2020 10:58 pm
Forum: Prospective Members
Topic: Is QUANTA stil alive / accepting members?
Replies: 13
Views: 1038

Re: Is QUANTA stil alive / accepting members?

martyn_hill wrote:Hi Dave

I can confirm that I continue to receive the periodic Quanta magazine, so my understanding is 'yes, Quanta is still very much alive...' :-)

Yes, the latest magazine came recently to my door.

Mark
by 1024MAK
Sat Apr 11, 2020 9:40 am
Forum: Software & Programming
Topic: ZX81 BASIC
Replies: 26
Views: 1525

Re: ZX81 BASIC

Go here for info on specBAS https://www.worldofspectrum.org/forums/discussion/57242/specbas-0-972-now-available Also there is help listed here http://www.zxspectrum4.net/forum/viewforum.php?f=6 A description of the most used emulator cassette file formats used for the ZX81 is given here http://probl...
by 1024MAK
Thu Apr 02, 2020 12:59 pm
Forum: Hardware
Topic: Confusion over Aurora Mouse port numbering
Replies: 5
Views: 312

Re: Confusion over Aurora Mouse port numbering

Keep in mind that conventional D-connectors existed before the idea was thought up of making IDC versions that could connect to IDC cable. Hence the numbering gets a bit confusing. Atari, Amiga, Acorn and some early PC mice are ‘bus’ mice. Two TTL digital lines are encoded with square waves for each...
by 1024MAK
Tue Mar 31, 2020 10:33 am
Forum: Hardware
Topic: QL Add-on ROM
Replies: 34
Views: 1779

Re: QL Add-on ROM

I strongly recommend you do use a resistor to pull up undriven address line inputs. For CMOS chips, a value of between 4.7kΩ and 10kΩ is suitable. If an address line for a CMOS SRAM is allowed to float, it will pick up interface and static charge from other conductors or conductive bodies/objects. A...
by 1024MAK
Tue Mar 31, 2020 9:34 am
Forum: Hardware
Topic: QL Add-on ROM
Replies: 34
Views: 1779

Re: QL Add-on ROM

Dave wrote:You could have a physical witch to connect /WR. If you tie it to 5V it can’t be written. A mechanical pull-up.

I would prefer a wizard, they tend to be more reliable and trustworthy :lol: :lol: :lol:

Mark
by 1024MAK
Sun Mar 29, 2020 3:56 pm
Forum: General QL Chat
Topic: Help with Composite out
Replies: 53
Views: 3390

Re: Help with Composite out

Some questions: ⋅ Am I reading that correctly with regard to SCART going into the two different modes? Some TVs (not many these days) have a user control to select which input system to use on the first (if more than one) or only SCART input. Most automatically switch input mode depending...
by 1024MAK
Sun Mar 29, 2020 3:23 pm
Forum: General QL Chat
Topic: Help with Composite out
Replies: 53
Views: 3390

Re: Help with Composite out

SCART (under a different name) is a product of the French. They passed a law requiring this type of connector to be fitted to all consumer TV/video equipment. It then became popular across Europe. But it has never been popular in the USA. As far as I am aware, nearly all TVs sold in the USA do not h...
by 1024MAK
Mon Jan 27, 2020 2:03 pm
Forum: The Off-Topic Section
Topic: QL vs BBC vs Amstrad 464
Replies: 9
Views: 1390

Re: QL vs BBC vs Amstrad 464

The 6502 CPU used in the BBC Micro only uses the data-bus when the CPU clock is high. Hence if you isolate the address and data lines, the video system can use the time when the CPU clock is low to get screen data from the main RAM. Hence no slowdown. Note that this does not apply if you want your 6...