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Re: ZX81CCP

Posted: Tue Feb 28, 2017 8:18 pm
by msansom
PokeMon,

Is the ZX8-CCB also good for adding composite video to a Spectrum 48k?

Re: ZX81CCP

Posted: Wed Mar 01, 2017 9:22 am
by PokeMon
No - it is for monochrome black and white only.

Re: ZX81CCP

Posted: Wed Mar 01, 2017 9:24 pm
by msansom
How is the latest batch of ZX8-CCB boards coming? Can we place an order soon?

Re: ZX81CCP

Posted: Tue Mar 21, 2017 3:42 pm
by PokeMon
Well - it took some time to get the ZX8-CCB back as it was sold out temporarily in end of january this year. Due to a member request I did add a special (optional) feature with a horizontal sync generator which delivers sync information when it is not available. Typical situations on a ZX81 (or ZX80) this is the FAST mode, LOAD and SAVE. It is like the ZX81-SCP I developed one time in a quite small series. There is a microcontroller on the backside able to overdrive the video signals.

The boards should be available in beginning of april (just ordered today as I did not find time in the past to do the changes and think of it) and the basic price will be the same for the standard module ZX8-CCB (without sync generator) with EUR 7.50 or GBP 6.00 and about EUR 11.50 or GBP 9.00 for the extended module. This may be available a few weeks later as the microcode has to be developed/tested from me first. It is now just prepared. It will also possible to upgrade the module later while soldering a programmed controller on the backside which is SMD but not to hard to solder with a 1.27mm or 0.05 inch pitch. Just for people who need it fast. ;)

The dimension of the board (21x25mm) and the position of the contacts/wires did not change.

Here is the new component side:
Bildschirmfoto 2017-03-21 um 16.12.10.png
Bildschirmfoto 2017-03-21 um 16.12.10.png (23.1 KiB) Viewed 288 times

and solder side:
Bildschirmfoto 2017-03-21 um 16.14.25.png
Bildschirmfoto 2017-03-21 um 16.14.25.png (17.24 KiB) Viewed 288 times

and schematics:
ZX8-CCB - Project.pdf
(34.37 KiB) Downloaded 27 times

Re: ZX81CCP

Posted: Tue Mar 21, 2017 5:35 pm
by blittled
I'm looking forward to seeing this since it is the next step to updating my ZX81 :D . I may also get a Z8-KDLX budget permitting. Does the special feature keep the screen from blanking out while in Fast mode? I see it uses a TI MSP430. I've had a little fun with those chips on the TI LaunchPads I have.

Re: ZX81CCP

Posted: Tue Mar 21, 2017 5:55 pm
by PokeMon
Yes - it is a MSP430 controller as I have some experiences with the development environment from earlier projects. An Attiny would do the job, too, I think. But it saves time when experienced with a controller family already. ;)

Re: ZX81CCP

Posted: Tue Mar 21, 2017 11:20 pm
by gammaray
So the old CCP board is NOT? upgradeable with the sync generator... :cry:

Re: ZX81CCP

Posted: Wed Mar 22, 2017 8:03 am
by PokeMon
Nope. You could do manually on a breadboard as schematic was attached. ;)

Re: ZX81CCP

Posted: Wed Mar 22, 2017 6:45 pm
by gammaray
Wonderful improvement! Now, how about a frame buffer to hold the screen until display can be executed?

Just sayin'...

;)

Re: ZX81CCP

Posted: Wed Mar 22, 2017 8:20 pm
by PokeMon
I made a study about that earlier already and have a solution in my mind but in the moment no chance to realize. Anyway would be larger in size and more expensive. I have another solution in my mind which may come in summer. Maybe. ;)