D.Coax communications buffer

This appendix describes a memory area known as the communications buffer that is used by all coax emulations.

Communications buffer

The communications buffer (figure D-1) contains a character buffer and an extended attribute buffer. Each of these buffers contains 4KB of storage.

The first 80 bytes of the character buffer contains the printer control information area (PCIA). The first 80 bytes of the attribute buffer contains the extended PCIA.

The remainder of the character buffer is a message area which contains data and commands necessary for printing. The attribute buffer can contain additional information about how each character prints.

Figure D-1.Communications buffer

PCIA

X`0000`ÐX`004F` described on the following pages

Character Buffer

X`0FFF`

Ext. PCIA

X`1000 to 104F` not used

Extended Attribute Buffer

X`1FFF`

XEROX MRP FAMILY COAX COMMAND REFERENCE

D-1

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Xerox 4215/MRP, 4230/MRP, 4220/MRP, 4219/MRP manual Communications buffer, Pcia, `0FFF`, `1FFF`
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