Changes
/* Amstrad/Schneider Printer Models */
* Early unihammer printer (with 7-dot columns)
* Very slow, with rather crude character set (without underlengths and without NLQ)
* Supports only 9 control codes (not compatible with Epsons or other standards)
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* The NLQ401 is a 9pin printer with NLQ und underlength support (thus much better than the DMP1). The NLQ character set is defined in very high horizontal resolution (even better than the NLQ sets in later DMP2000..DMP3000 models).
* Unlike DMP1 and DMP2000..3000, the NLQ401 doesn't include a SRAM chip (so data can be buffered only in a portion of the CPU's on-chip 256-byte RAM).
* Supports some custom control codes mixed with some Epson codes, but isn't actually Epson compatible (a couple of Epson codes are missing, and Epson graphics codes are crippled to 7bit).
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