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Messages - pear

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1
Táp / Re: Belső +12V tápáramkör
« on: 2020.November.26. 08:12:55 »
Why modify the power supply ?
It is enough to buy a cable for a dollar and change the polarity inside the switch.
Additionally, we have a power switch.

3
Hardware / Re: Replacement for a standard cartridge
« on: 2020.November.24. 16:21:13 »
Attached are the schemes with the values of the elements.

4
I have the same :)
Free talk in a foreign language is a too big challenge for me. Sorry.

5
Műanyag alkatrészek gyártása / Re: Általános
« on: 2020.November.01. 18:10:46 »
My design differs from the original but is optimized for print and still fits and does its job.
I used transparent PETG. The LED light is visible enough.

6
Műanyag alkatrészek gyártása / Re: Általános
« on: 2020.November.01. 09:57:20 »
This is my version for 3D printer (OpenSCAD).
Requires brim to catch the first layer well.
Attached are the GCODE file for the Prusa MK3S printer.
Code: [Select]
Dzew=10.9;
Dwew=7.8;
Dtop=3.5;
Ltop=3.9;
Legs=6.8;

Rzew=Dzew/2;
Rwew=Dwew/2;
Rtop=Dtop/2;
Rc=Rwew+(Rzew-Rwew)/2;
$fn=100;

rotate([180,0,0]) {
  difference() {
    union() {
      translate([0,0,0]) cylinder(Legs,Rzew,Rzew);
      translate([0,0,Legs]) cylinder(7.2,Rzew,Rzew);
      translate([0,0,Legs+7.2]) cylinder(6.9,Rzew,Rtop);
      translate([0,0,Legs+14.1]) cylinder(Ltop,Rtop,Rtop);
    }
    translate([0,0,-0.01]) cylinder(Legs+0.02,Rwew,Rwew);
    translate([0,0,Legs-0.01]) cylinder(7.2+0.02,Rwew,Rwew);
    translate([0,0,Legs+7.2]) cylinder(4.5,Rwew,2.5);
    for(i=[0:2]) {
      translate([cos(360*i/3)*Rc,sin(360*i/3)*Rc,-0.01]) cylinder(Legs,Rc-0.5,2);
    }
  }
  translate([0,0,Legs+12.2]) sphere(2.4);
}

7
Interface / Re: Internal memory expansion
« on: 2020.October.16. 10:13:23 »
The ROM programs should be in banks with numbers x0-x3 hex.
It's good to leave room for them.

8
Hardware / Re: ZX Spectrum Emulator Card
« on: 2020.October.11. 13:28:32 »
Did you know that the ZX Spectrum Emulator 4.1 does not work without 64KB RAM in the F8-FB banks ?
It doesn't work with EP64, for example.
But it also doesn't work when you mount additional RAM banks in areas other than the F8-FB.

9
Memória / Re: 512K belső RAM bővítés - II
« on: 2020.October.09. 11:16:28 »
Still valid - as long as shipping is possible.
Thanks for reminding me, I forgot about it completely.

10
Interface / Re: Creating EXDOS card clone
« on: 2020.September.14. 17:03:01 »
I ordered 15 pieces. We'll see what comes out.

11
Interface / Re: Creating EXDOS card clone
« on: 2020.September.14. 09:24:10 »
Ok. Thanks for the info. It's time for shopping ;)

12
Interface / Re: Creating EXDOS card clone
« on: 2020.September.13. 19:18:31 »
Is it a proven supplier ? Someone has already shopped there ?
Payment by card only directly from the site. Too risky without checking.

13
Interface / Re: Creating EXDOS card clone
« on: 2020.September.02. 06:35:54 »
I wrote just that I will not make cards with generic WD1772.
I did not write that I will not make any EXDOS cards anymore.
I'm looking for other solutions.

14
Interface / Re: Creating EXDOS card clone
« on: 2020.September.01. 19:13:55 »
As I will not be making EXDOS cards anymore using the generic WD1772, because of the difficulties in purchasing and the absurd price of this chip, I provide on the WIKI the card documentation.

15
If the voltage at input 78L12 is lower than 12V, it means that the converter is not working (probably TR2 failed).
Below is a diagram (description in the thread).

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