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EIA (NTSC) 60 Hz version

Although Durango·X was initially designed around the CCIR TV standards used in Spain and in most PAL countries, there is an alternative version compatible with the EIA standard most used in NTSC countries, allowing worldwide use of this computer architecture.

Note

Although the terms PAL and NTSC are commonly used to describe the regional versions of many consoles and home computers, these are not accurate for the Durango computers, as they lack a chroma subcarrier encoded in either PAL or NTSC (or SECAM, for that matter), using direct RGB or component video connections instead, for higher quality picture. But the refresh rates and number of rasters must match the desired standard (625/50 for CCIR and 525/60 for EIA) in any case.

Most of the times EIA countries use NTSC for colour encoding, and CCIR use PAL, but not always.

Specs

  • 1.57 MHz (3.15 MHz with turbo option) from a readily available 25.175 MHz VGA oscillator.
  • Component video output and/or greyscale composite signal (SCART is not available).
  • Display: 256 x 192 pixels in monochrome HIRES or 128 x 96 pixels in the usual 16-colour mode
  • Momentary display of the bottom 64 rasters (64 lines in HIRES, 32 in colour) for existing software compatibility.

Remaining specs are the same as the CCIR (50 Hz) version.