@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...

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

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

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...

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...

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...

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

Mark

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...

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...

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...