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- 6th July 1992
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- Support Group Application Note
- Number: 013
- Issue: 1
- Author:
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-
- Acorn Electron Plus One: Disabling the Centronics and A/D Port
-
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- Applicable Hardware: Acorn Electron
-
- Related Application Notes:
-
-
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- Copyright (C) Acorn Computers Limited 1992
-
- Every effort has been made to ensure that the information in this leaflet is
- true and correct at the time of printing. However, the products described in
- this leaflet are subject to continuous development and improvements and
- Acorn Computers Limited reserves the right to change its specifications at
- any time. Acorn Computers Limited cannot accept liability for any loss or
- damage arising from the use of any information or particulars in this
- leaflet. ACORN, ECONET and ARCHIMEDES are trademarks of Acorn Computers
- Limited.
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- Support Group
- Acorn Computers Limited
- Acorn House
- Vision Park
- Histon
- Cambridge CB4 4AE
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-
- We have received a number of enquiries regarding the Plus One with other
- software houses products, which make use of some of the locations reserved
- in the operating system. Such software usually works on the Acorn Electron
- alone, but not with the Plus One fitted. Issuing the command *FX 163,128,1
- as described in the User Guide may be sufficient to enable the software to
- be used; if not the following code will remove the Plus One completely from
- the address map disabling the Centronics and A/D ports (additionally
- disabling the RS423 cartridge if fitted).
-
- Pressing <BREAK> will return the Electron to its normal state. The routine
- can be saved on cassette/disc and CHAINed prior to loading the required
- program.
-
- 10 *FX 163,128,1
- 20 A%=&AA : X%=0 : Y%=&FF
- 30 !&80=USR&FFF4 : A%=!&81
- 40 A%?12=0
-
-
- NB: This routine will not operate across the tube.