MemOut Statement

Simultaneously sets 8 memory I/O bits.

Syntax
MemOut portNumber, outData

Parameters

Portnum

Specify the memory I/O byte port number. The portNumber selection corresponds to the following:

Port Number	Outputs
0	0-7
1	8-15
...	...

Outputs

Specify the output pattern for the output group specified by port number as an integer value from 0 to 255. If represented in hexadecimal form the range is from &H0 to &HFF. The lower digit represents the least significant digits (or the 1st 4 outputs) and the upper digit represents the most significant digits (or the 2nd 4 outputs).

Description
MemOut simultaneously sets 8 memory I/O bits using the combination of the portNumber and outData values specified by the user to determine which outputs will be set. The portNumber parameter specifies which group of 8 outputs to use where portNumber = 0 means outputs 0 to 7, portNumber = 1 means outputs 8 to 15, etc. Once a portNumber is selected, a specific output pattern must be defined.

This is done using the outData parameter. The outData parameter may have a value between 0 and 255 and may be represented in hexadecimal or integer format. (i.e. &H0 to &HFF or 0 to 255)

The table below shows some of the possible I/O combinations and their associated outData values assuming that portNumber is “0”, and “1” accordingly.

Output Settings When portNumber=0 (Output number)

OutData Value	7	6	5	4	3	2	1	0
01	Off	Off	Off	Off	Off	Off	Off	On
02	Off	Off	Off	Off	Off	Off	On	Off
03	Off	Off	Off	Off	Off	Off	On	On
08	Off	Off	Off	Off	On	Off	Off	Off
09	Off	Off	Off	Off	On	Off	Off	On
10	Off	Off	Off	Off	On	Off	On	Off
11	Off	Off	Off	Off	On	Off	On	On
99	Off	On	On	Off	Off	Off	On	On
255	On	On	On	On	On	On	On	On

Output Settings When portNumber=1 (Output number)

OutData Value	15	14	13	12	11	10	9	8
01	Off	Off	Off	Off	Off	Off	Off	On
02	Off	Off	Off	Off	Off	Off	On	Off
03	Off	Off	Off	Off	Off	Off	On	On
08	Off	Off	Off	Off	On	Off	Off	Off
09	Off	Off	Off	Off	On	Off	Off	On
10	Off	Off	Off	Off	On	Off	On	Off
11	Off	Off	Off	Off	On	Off	On	On
99	Off	On	On	Off	Off	Off	On	On
255	On	On	On	On	On	On	On	On

See Also
In, MemIn, InBCD, MemOff, MemOn, MemSw, Off, On, OpBCD, Oport, Out, Sw, Wait

MemOut Statement Example
The example below shows main task starting a background task called “iotask”. The “iotask” is a simple task to toggle memory I/O bits from 0 to 3 On and Off. The MemOut instruction makes this possible using only 1 command rather than turning each memory I/O bit on and off individually.

Function main
  Xqt 2, iotask
  Go P1
  .
  .
Fend

Function iotask

  Do
    MemOut 0, &H

    Wait 1
    MemOut 0, &H0
    Wait 1
  Loop
Fend

Other simple examples from the Command window are as follows:

> MemOut 1,6    'Turns on memory I/O bits 9 & 10
> MemOut 2,1    'Turns on memory I/O bit 8
> MemOut 3,91    'Turns on memory I/O bits 24, 25, 27, 28, and 30