Remote Processing Coorporation RPC-320 Dokumentacja Pobierz pdf (Strona 37)

Commands - 7

BIN

Numeric Function

SYNTAX: n = BIN(m)

PURPOSE: To return a number from a packed BCD number.

REMARKS: This function assumes that the BCD digits are packed. That is, there are four BCD digits per 16–bits.

EXAMPLE: A = BIN(B)

Normally, the only way BCD data can enter the system is through an I/O port like those on the 82C55

(e.g. reading a two digit BCD thumbwheel switch).

Each of the two switches has four outputs. Together, the eight lines are connected to an I/O port

input. Assuming the thumbwheel switches are set to 98 and connected to I/O port &18, the port input

would look as follows (where D0 through D7 are the eight data bits):

D7 D6 D5 D4 D3 D2 D1 D0

1 0 0 1 1 0 0 0

The example below appears wrong at first. However, CAMBASIC assumed that this was a binary

number and gave you the decimal equivalent.

PRINT INP(&18)

152

To get the correct result:

PRINT BIN(INP(&18))

ERROR: <Illegal argument> – if any BCD digit > 9

<Data negative > – for m

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 185 186

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Remote Processing Coorporation RPC-320 Dokumentacja Strona 37