Search found 38 matches

by Papalapa
Fri Sep 22, 2023 11:22 am
Forum: Hardware
Topic: ¿A Jupiter Ace clone kickstarter?
Replies: 6
Views: 3151

Re: ¿A Jupiter Ace clone kickstarter?

@wilco2009 Survey replied. How's this matter going on?
by Papalapa
Thu Aug 24, 2023 5:59 pm
Forum: Software
Topic: ZX80 software
Replies: 7
Views: 5769

Re: ZX80 software

The lack of software is easily explained, the ZX81 ROM could be put in a ZX80. In fact it was designed to work also as a "retrofit", but obviously you couldn't take benefit of the SLOW feature. Some of the existing ZX81 programs could then run on a ZX80, there were commercial program declaring they...
by Papalapa
Fri Aug 18, 2023 7:07 pm
Forum: Software
Topic: ZX80 software
Replies: 7
Views: 5769

Re: ZX80 software

Thank you both ;)
by Papalapa
Fri Aug 18, 2023 11:12 am
Forum: Software
Topic: ZX80 software
Replies: 7
Views: 5769

ZX80 software

Recenty I built the Wilco ZX80 clone and I was surprised because I didn't found software for it. In fact I only own 5 games but nothing else. With my ZX81 it was easy, even the Internet Archive is full of programs for this computer. Anyone knows where can I find the same for the ZX80? Here's my baby...
by Papalapa
Tue Jul 09, 2019 8:42 am
Forum: Hardware
Topic: 16k internal RAM and graphics issue (I think).
Replies: 11
Views: 5113

Re: 16k internal RAM and graphics issue (I think).

Don’t bother with the 10kΩ resistor, as this is only required if you are fitting a battery back-up system [see http://www.zx81.de/english/32k-rame.htm ]. Without a battery, it serves no purpose. With modern faster SRAM chips, sometimes a control line to the SRAM chip may need a low value capacitor ...
by Papalapa
Mon Jul 08, 2019 8:44 am
Forum: Hardware
Topic: 16k internal RAM and graphics issue (I think).
Replies: 11
Views: 5113

Re: 16k internal RAM and graphics issue (I think).

I have done the same MOD and even with the 10K SMD resistor I get this kind of "noise" on the pictures.

In my case the solution was to add a 68pF capacitor between the pins 20 and 22 of the IC.
by Papalapa
Mon Jul 01, 2019 12:14 pm
Forum: Hardware
Topic: Memopak 16k - in need of new caps etc. before being used?
Replies: 14
Views: 5794

Re: Memopak 16k - in need of new caps etc. before being used?

This looks like it. http://www.zx81.de/memotech/memory16.txt Many thanks Lardo, I see that in fact they are only used to set the RAMpack as master or slave. Humm.... I remember that the original XT IBM PCs also have the same DIP switches to setup the floppy drives as A or B Long time ago.... :D
by Papalapa
Sun Jun 30, 2019 11:55 am
Forum: Hardware
Topic: Memopak 16k - in need of new caps etc. before being used?
Replies: 14
Views: 5794

Re: Memopak 16k - in need of new caps etc. before being used?

I'm sorry to refloat this post after more than two years, but I have a question about the Memopak 16K What the hell are the DIP switches on the back of the module used for? I download the user manual and there's no mention on it, also I do not found any information in Internet. Anyone has some infor...
by Papalapa
Thu Jun 13, 2019 9:32 am
Forum: Hardware
Topic: White screen and no cursor at all
Replies: 38
Views: 13657

Re: White screen and no cursor at all

Well, finally I get an original C210 ULA for the second Zeddy and once installed is perfectly working.

Now is time to play with the TZXduino and the old software :D
by Papalapa
Mon Jun 10, 2019 8:45 am
Forum: Hardware
Topic: White screen and no cursor at all
Replies: 38
Views: 13657

Re: White screen and no cursor at all

Just checked my order history on Sell My Retro and it appears I have fitted 24 like this! I have not had to move R1 much from there on any of them. I believe PokeMon sets them up for one ULA type before sending them out... So you should only need to adjust them slightly if using the same ULA type. ...