Lambda 8300/Power 3000 Mutlirom

sascha2000
Posts: 57
Joined: Fri Jul 22, 2011 2:13 pm

Lambda 8300/Power 3000 Mutlirom

Post by 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
Posts: 1331
Joined: Thu May 08, 2008 8:42 am
Location: Stoke-on-Trent, UK
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Re: Lambda 8300/Power 3000 Mutlirom

Post by RWAP »

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

sascha2000
Posts: 57
Joined: Fri Jul 22, 2011 2:13 pm

Re: Lambda 8300/Power 3000 Mutlirom

Post by 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

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iturbez
Posts: 151
Joined: Fri Dec 25, 2009 1:06 pm
Location: Spain

Re: Lambda 8300/Power 3000 Mutlirom

Post by iturbez »

I don't speak German...

Could you explain what Lambda is?

Thaks in advance.

sascha2000
Posts: 57
Joined: Fri Jul 22, 2011 2:13 pm

Re: Lambda 8300/Power 3000 Mutlirom

Post by 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
Posts: 57
Joined: Fri Jul 22, 2011 2:13 pm

Re: Lambda 8300/Power 3000 Mutlirom

Post by 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

User avatar
iturbez
Posts: 151
Joined: Fri Dec 25, 2009 1:06 pm
Location: Spain

Re: Lambda 8300/Power 3000 Mutlirom

Post by iturbez »

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

sascha2000
Posts: 57
Joined: Fri Jul 22, 2011 2:13 pm

Re: Lambda 8300/Power 3000 Mutlirom

Post by 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.

User avatar
1024MAK
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Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Lambda 8300/Power 3000 Mutlirom

Post by 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 :D

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

Mark


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