Make this my favourite DISCOUNT Beta Disk 128C floppy Controller ZX Spectrum 48K/128K - NEW '2019' VERSION!!

Retro Computers >> Sinclair >> Sinclair ZX Spectrum >> Hardware >> General / Add-Ons
Listing type:
Fixed Price Multiple Items
Item Condition:
Seller location:
Karlovy Vary, Czech Republic
Ending in:
This listing is closed (27/03/2019)

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Latest buyer:
m***r (8)
Fixed price:
$80.95 USD
Shipping Costs:
From only $8.00 USD
Payment methods:
Paypal, Bank transfer
Number Sold:
1 (View history)
Buyer Value Date and hour Quantity bought
m***r (8) $80.95 USD 27/03/2019 00:18:03 1
Feedback on this Item
PositivePositive m***r (8) superb! 07/04/2019 16:55:00

Item Number : 36984

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Beginning of spring discount!

94.95 - 80.95USD

A NEW '2019' VERSION !!!



(Complete, finished, functional device)
(Custom manufacturing, send time about 10 days)


Advantages over competitors:

Proven, classical, tested design, no "black box" CPLD parts without documentation, quality processing, a very good solutions for supply routes!!! Precise solutions for interference!!! All signals amplified by the driver!!!



Beta Disk 128C is a controller for 1 to 4 floppy disk drives for ZX Spectrum and compatible
computers. It comes from the original interface of the same name from British company named Technology
Research Ltd, with which it is fully compatible. The design is virtually unchanged from the original wiring,
with just a few changes, the description of which will go further. This ensures compatibility with the original

"128" in the interface name indicates that it is a version of the ZX Spectrum operating with both 48KB and
128KB RAM. „C“ indicates Czech clone :-), or controller producer CSS Electronics, as you like ;-)


- Optional to connect 1 to 4 floppy drives 3.5" or 5.25"
- Fully compatible with the ZX Spectrum 48KB, 128KB „toast rack“ and 128K +2 Amstrad gray box. It
is also compatible with other ZX Spectrum clones with a standard system connector and ROM
compatible with ZX Spectrum 48KB or 128KB, for example Didaktik M. Didaktik Gama can be
connected after additional fixing, see next description. Interface is incompatible with the ZX
Spectrum +2A, +2B and +3, these have non-standard signals ROMCS (2x) on the edge
connector and incompatible ROM.
- The device is realized on two printed circuit boards horizontally connected by connectors
- Fully through bus on the bottom board, drivers for all signals for the controller and memory on the
top board
- Used original FDC1793 floppy disk controller or analog
- Newly two different versions of the system TR-DOS, 5.05cz Fixed (stable high quality system) + 5.041 (contains TURBO Format of diskettes)
- LED power-on indication (green LED) and TR-DOS system activation (red LED)
- The bottom board (buses and drivers) are powered directly from the computer, top board (TR-DOS
and floppy controller) is powered by external source 7,5-9V/300mA max. via the rounded DC
power source connector 3,5/1,4mm (positive pole center)


Because the schematic is largely taken from the original interface, is directly compatible with these
computers without any further modifications:
- ZX Spectrum 48KB
- ZX Spectrum 128KB „toast rack“ with radiator to the right
- ZX Spectrum 128KB +2 Amstrad gray box
- Didaktik M
- Other clone with standard system bus connector and compatible Sinclair Basic ROM

Compatibility depends on whether your computer is equipped with a system connector with a
standard distribution of the appropriate signals, which the Beta Disk 128C interface uses.



Complete documentation is available here:

English language PDF:!hXp4afdPzT3B/betadisk-128c-v1-8-rev-1-eng-rar

Czech language PDF:!y68aBwlkZr4P/betadisk-128c-v1-8-rev-1-cz-rar



Picture gallery

  • DISCOUNT Beta Disk 128C floppy Controller ZX Spectrum 48K/128K - NEW '2019' VERSION!!
  • DISCOUNT Beta Disk 128C floppy Controller ZX Spectrum 48K/128K - NEW '2019' VERSION!!
  • DISCOUNT Beta Disk 128C floppy Controller ZX Spectrum 48K/128K - NEW '2019' VERSION!!

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Shipping and Payment

Item Location:
Karlovy Vary, Czech Republic
Shipping conditions:
Buyer pays shipping expenses
Shipment fee:
  • To Czech Republic :
  • First Class Post : $8.00 USD
  • To EU :
  • Airmail Post : $15.50 USD
  • To Rest of Europe :
  • Airmail Post : $20.00 USD
  • To Rest of World :
  • Airmail Post : $22.00 USD
Shipment terms:
Not specified
Payment methods:
Paypal, Bank transfer

The seller accepts all responsibility for this listing

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