zx spectrum in zx81 case

superfo
Posts: 57
Joined: Wed Jul 08, 2009 9:12 am

Re: zx spectrum in zx81 case

Post by superfo » Wed Nov 22, 2017 6:08 am

PokeMon wrote:
Wed Nov 22, 2017 12:10 am
Andy Rea wrote:
Tue Nov 21, 2017 5:36 pm
Where can i get one ?

Andy
I would be interested, too.
Hi,
I may have PCB sell on SellMyRetro soon.
You can download project file from here (include Altium PCB file)

https://onedrive.live.com/?id=E0ADBB58A ... 58ADB8D869

superfo
Posts: 57
Joined: Wed Jul 08, 2009 9:12 am

Re: zx spectrum in zx81 case

Post by superfo » Wed Nov 22, 2017 6:24 am

Here is another one in Ben Heck's case

Image

Image

Image

Image

superfo
Posts: 57
Joined: Wed Jul 08, 2009 9:12 am

Re: zx spectrum in zx81 case

Post by superfo » Wed Nov 22, 2017 6:27 am

1024MAK wrote:
Tue Nov 21, 2017 5:30 pm
8-) 8-) 8-) :D

However, it should have either a green or a red solder resist on the bottom :mrgreen:

Mark
Good idea :)

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PokeMon
Posts: 2225
Joined: Sat Sep 17, 2011 6:48 pm

Re: zx spectrum in zx81 case

Post by PokeMon » Wed Nov 22, 2017 10:16 pm

superfo wrote:
Wed Nov 22, 2017 6:08 am
Hi,
I may have PCB sell on SellMyRetro soon.
You can download project file from here (include Altium PCB file)

https://onedrive.live.com/?id=E0ADBB58A ... 58ADB8D869
Thanks for sharing the data.
I would appreciate to buy a pcb on SMR as soon as available. 8-)

McKlaud
Posts: 132
Joined: Tue Dec 19, 2017 10:02 pm
Location: St Albans, UK

Re: zx spectrum in zx81 case

Post by McKlaud » Sun Dec 24, 2017 2:06 am

My ZX Max48 issue 1

Image

I am trying to use the ZX81 keyboard with ZX Max but, some changes are needed to KBD lines assignments in the CPLD.

BTW there is also newer Issue 2 in the wild. Iss2 does have additionally the AY chip and Kempston joystick interface.
Claudius
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McKlaud
Posts: 132
Joined: Tue Dec 19, 2017 10:02 pm
Location: St Albans, UK

Re: zx spectrum in zx81 case

Post by McKlaud » Sun Dec 24, 2017 12:41 pm

Sorted! Now ZXmax can work with any ZX81 keyboard :geek:
Claudius
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msch
Posts: 53
Joined: Sun May 19, 2013 11:39 pm

Re: zx spectrum in zx81 case

Post by msch » Sun Dec 24, 2017 1:45 pm

@McKlaud: cool!
@superfo: I am interested too - please put me on Your list.
ZX-Team member, Germany

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PokeMon
Posts: 2225
Joined: Sat Sep 17, 2011 6:48 pm

Re: zx spectrum in zx81 case

Post by PokeMon » Sun Dec 24, 2017 2:19 pm

McKlaud wrote:
Sun Dec 24, 2017 12:41 pm
Sorted! Now ZXmax can work with any ZX81 keyboard :geek:
I think the order of some address lines is different for ZX81 and ZX spectrum keyboard. Would you be so nice and publish your changes ? Would be great.

Thanks, Karl

Zxkim81
Posts: 29
Joined: Sat Mar 18, 2017 7:44 pm

Re: zx spectrum in zx81 case

Post by Zxkim81 » Sun Dec 24, 2017 5:21 pm

Hi I think that's interesting a spectrum in a zx81 case. How far has the project got?
Are you going to sell this product if so do you have a price in mind.
I'd like one when they are available. thanks

McKlaud
Posts: 132
Joined: Tue Dec 19, 2017 10:02 pm
Location: St Albans, UK

Re: zx spectrum in zx81 case

Post by McKlaud » Mon Dec 25, 2017 10:41 am

PokeMon wrote:
Sun Dec 24, 2017 2:19 pm
Would you be so nice and publish your changes ? Would be great.
Karl,

Yes, sure. My modifications to the Issue 1 board are as follows:

I spoke with Suprefo and we agreed that it would be a clean solution if minor changes to the CPLD file were done. The keyboard data lines been remapped to match ZX81 layout (KBD0 and KBD1 were swapped with KBD4 and KBD3 respectively). Additionally two diodes (D5 & D6) on address lines (A12 & A9) were crossed on the board. And that is all.

There is also high probability of frying transistor Q2 (BC548) while using 8 Ohms beeper, so I would recommend adding 33R resistor in series with LS1.
Claudius
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