Lambda 8300/Power 3000 Mutlirom

[sascha2000]

Hello,

after a long time of absence I had little time to solder a Multirom PCB for my Lambda.

The following ROMS are currently burned:

Lambda 8300 ROM modified ZX81 compatible.rom
Lambda 8300.rom
Power 3000.rom
Power 3000 ROM with colour kit commands.rom


Just have a look here, its in german however pictures should be clear.

http://forum.tlienhard.com/phpBB3/viewt ... ?f=2&t=783

Regards
Sascha

[RWAP]

I'm glad to see the Lambda came in useful !!

[sascha2000]

Hello,

we are currently discussing in the german forum, if should produce a small quantity of PCBs, about 4-8. (Even more could be produced, which may not be realistic )

If we get 8 orders price would be about 8€ +shipping per pcb (estimated), if we only get 4 orders price would be about 13€ +shipping.

The PCB would come without any component (Eprom, etc) and must be soldered manually by the buyer. Of course if needed I can sell the parts, I have some in my storage. Price would become pretty fair.

Is someone here who would be interrested?

If enough persons will reply, I will finish the layout and perform an exact calculation and show photos here in the forum. If then all still agree I will produce the boards.

Additional ideas to be discussed:
Sbetamax suggested to have a flip flop counter for selecting the ROMs. So only one external pushbutton would be enough to change roms on the fly.

Regards
Sascha

[iturbez]

I don't speak German...

Could you explain what Lambda is?

Thaks in advance.

[sascha2000]

Hello iturbez,

its a ZX81 clone from Hong Kong.

Just have a look here: http://k1.dyndns.org/Vintage/Sinclair/8 ... ng%20Kong/

Regards
Sascha

[sascha2000]

Hello,

I got now from 4 ZX-TEAM members the feedback that they want to purchase such a MultiRom PCB.

So I'll start this project now. The progress I will document here in this thread.

Regards
Sascha

[iturbez]

Thank you very much for the info, sascha2000...

[sascha2000]

UPDATE:

I have now a working proto. Now we go in the following direction:

* Use Lambda Keyboard + Reset button to change the ROM configuration. Soldering needed.
* Optional use external switches to change the ROM configuration. No soldering needed.
* Design it in a way to remain ZX81 compatible.

[1024MAK]

Hi Sascha

I would be very interested in buying a PCB.

If it is possible and practical to build a working unit, consider this a firm order

Please keep us informed. Once it comes time for the money, let me know and then we can sort out payment details.

Mark

[sascha2000]

Hallo,

here some movies:

Part 1:
http://www.youtube.com/watch?v=O9Ympxjw1Vg

Part 2:
http://www.youtube.com/watch?v=SCrIrSrc ... re=related

Part 3:
http://www.youtube.com/watch?v=lH8igenB ... ure=relmfu

Regards

Sascha