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Byte_to_ZX_Spectrum

Converter board for the Belarusian ZX Spectrum clone called the Байт (Byte).

This machine has an, ahem, excessive 96-pin connector called an СНП59-96 (SNP59). This connector has three rows of 32 pins each and is almost the same as a DIN41612 connector ... except for the Soviet-era 2.5mm pin pitch (compared to Western 2.54mm).

So a DIN41612 connector will not work. That's the first issue.

The second issue is, of course, it's not a Spectrum edge connector so peripherals won't connect anyway.

The problem

Special notes "Connecting DivIDE to BYTE":

  • Pin A25 from divIDE we connect to byte on which we send out a low romcs signal such as the pin A30:
  • Cut pin 4 or 4/5 of the DD67 (555ИД7) chip from ground and solder a resistor (180Ω to 10kΩ)
  • Use a cable to lead pin 4 or 4/5 to a free pin of the edge connector, e.g. A30
  • ROMCS signal (A25) from DivIDE connect to pin A30

ROMCS signal

Current status (28-Sept-2023):

  • Connectors and test boards have arrived
  • Not working with DivMMC - investigating

Test board

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Converter board for the Belarusian ZX Spectrum clone

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