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            Dear Visitor, Welcome to my online shop. My name is Przemyslaw Krawczyk, but commonly I`m known to people of Polish Atari Scene  ( and maybe not only...but who knows?) as "lotharek". I`m very happy you got here.

           My mission is to deliver high quality devices in good prices. Devices, that follow modern environment standards (ROHS, Weee, Gios) and satisfy customer needs.  My devices are made at automatic assembly lines by PP ELECTRNONIX, parts are  supplied by MICROS in almost 90%, ABS casings are made by Maszczyk, metal ones by SESMIL. All my devices before postage are tested and checked personally by me, then securely packed. 

        In past I have used EBAY.CO.UK ( look at my feedback left by customers)  to sell my stuff. Why UK ?? Simple, I have spent there two years of my live, improving my language skills and acquiring some western approach to life ;-)

      Time has passed,  upgrades have been developed and improved... Since 2008 I cooperate with Jeff - creator of SD and USB Floppy emulators, also new cooperation with Candle`o`Sin have been recently introduced, that hopefully will bring to life some new ideas for retro gaming enthusasts like me and you

    If you have interesting idea/project, do not hesitate to contact me. I may be able to commercialize your project worldwide.


     Also, worth mentioning is fact, that part of my income goes to those, who need it most. Thanks to your purchase I can keep on helping kids from Special Needs School in Piekary Slaskie. In addition, I`m one of the supporters of KID`S DAY in my JUDO CLUB, where big party is organised and money collected for kids. Last, but not least, I support almost every retro party I visit and Judo Club CZARNI BYTON as this sport - next to retro gaming -  is my passion.





Once again – Thank You for Your purchase and Your support.

 Please, remember - supporting me, You support all my charity activity we both shall be proud of. 


New products at Lotharek`s Lair17.07.2019 15:02


I`m happy to announce new products available at my shop:

  • KEMPAY_CPLD  2x Joysticks/AY interface for ZX and compatible / more details HERE
  • ZX SRAM 32kB  -  base CPU sram 32KB replacement  / more details HERE /  
  • Z80SRAM - RAM / CPU module  - as above, bit with Z80 CPU  integrated / more details HERE
  • Video 16kB SRAM module / more details HERE



  • MICRO ULTRASATAN / more details HERE
  • DIVIDE 2k20 / more details HERE


ATARI LOST PARTY10.07.2019 7:59

Dear Visitor,

Till Sunday i`m away from Lair, visiting ATARI LOST PARTY. 

All mails will be answered after my return.


Micro Ultrasatan preorder starts today 19.06.2019 20:48

Micro Ultrasatan preorder starts today - all details at my www:

Deliveries end of AUGUST !!



6502 +4 is almost ready18.06.2019 19:37

Candle`O`Sin  has released video with last invention. 6502 +4  is CPU replacement of main CPU in Commodore C+4/c16/C116 machines with additionanl sram. You can watch video HERE:

Soon, device will available at Lotharek`s Lair at item`s page


Ebay`s end ...27.05.2019 12:24
I`m very sad to announce, that all my ebays` listing have been cancelled. I `m honestly very dissapointed with Ebays attitude and their high prices / insertion fees and others/. Also, the resaon I quit Ebay, is their "CUSTOMER SERVICE" . I hope someday this service will be more seller friendly.
1050E preorder16.05.2019 12:24

I`m happy to announce, that 1050E upgrade is available in preorder.

Deliveries - and of June.


Turbo upgrade for ATARI 1050 DRIVES

  • solderless
  • upgrade constists of 2 steps: remove 3 chips; insert 1050 into disk drive



  • ultra speed (pokey divisor 6)
  • 180 KB per side ( DD - instead of SD )
  • Flashable firmware and sofft  slot 


More about device:



Furia new firmware 12.714.05.2019 9:36

Boris has just released new firmware for Furia cards.

2 versions are available for download:

2K memory chips :

4K memory chips:


Upgrading firmware need isp cable and impact xillinx software. 



New products at Loth`s Lair06.05.2019 22:38

I`m very happy to announce new products are coming  soon to my offer:


  • Turbo Upgrade for ATARI 1050 drives is coming. More info soon HERE




  • TZX player.  More info soon HERE


  • HXC floppy emualator MICRO. More info soon HERE


And best for last :

  • Melody CART for ATARI with AY chip
  • Melody CART for ATARI with ADLIB synthesis chip




KempAY preorder03.05.2019 18:27

Dual joystick interface/ AY interface for ZX and compatible preorder starts today.

Main fetaures: 

  • AY / Yamaha sound generator running at exact speed of 1,75 Mhz (new programmable frequency generator from EPSON (SG8002CA+ PHB)
  • stereo line output ( jack stereo)
  • 2 joystick ports with ativity leds
  • multifunction switch (RESET, JOY MODE for port 1)
  • fully passthrough - you can connect any device that uses ZX Edge connector.
  • Autofire - fully compatible with typical AMIGA/ATARI/C64 josytsticks.
  • Fully compatible with Kempston mouse and others
  • build upon Atf1504 CPLD
  • Beeper sound at stereo ouput on both channels
  • ABC/ACB channels switch
  • Planned in firmware: SEGA pad additional fire buttons ....


More about device here:




Netusbee drivers v428.03.2019 14:30


New driver package for NetUSBee has been introduced by Claude. 


  • Added keyboard and printer drivers
  • Mouse wheel scrolling more dynamic
  • Updated storage driver for card readers
  • Updated documentation
  • Updated usbtool.acc (devices without drivers greyed out)


Direct DOWNLOAD LINK: NETUSB02 v4 drivers (2019_03_28)

Netusbee site: