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- 20th October 1992
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- Support Group Application Note
- Number: 054
- Issue: 1
- Author:
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-
- Connecting a 5.25 inch Disc Drive to a Master Compact
-
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- Applicable Hardware: BBC Master Compact
-
- 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
- -----------------------------------------------------------------------------
-
-
- The Master Compact Microcomputer uses 3.5 inch disc drives. It is therefore
- not directly possible to read 5.25 inch discs which may have been created
- from other BBC Microcomputers such as the B, B+ or Master 128.
-
- It is possible to connect a 5.25 inch disc drive to the Master Compact for
- the purpose of transferring information between 5.25 inch and 3.5 inch
- formats. However 5.25 inch discs should not be used as a means of data
- distribution, and only 3.5 inch discs are recommended for data storage on
- the Master Compact.
-
- The 5.25 inch disc drive should be mains powered and should be of a modern
- type. The 1772 controller IC used in the Master Compact will not support
- step speeds of lower than 12ms. Some older drives take up to 30ms, and this
- will not be compatible with the Master Compact. Generally speaking, half
- height drives will be suitable.
-
- The 5.25 inch disc drive must be configured as drive one. The method for
- doing this varies between make of drive. Generally, the drive case will
- need removing, and a jumper moved from the position marked DS0 to the
- position marked DS1. The drive must be disconnected from the mains supply
- before doing this.
-
- A special cable must be made in order to connect both 5.25 inch drives and
- 3.5 inch drives to the Master Compact. The attached diagram show the cable
- required. The special cable should be connected to the back of the Compact
- computer keyboard unit, the Compact Monitor Stand (disc drive) should be
- connected to the 25 way 'D' type connector on the cable, and the 5.25 inch
- disc drive should be connected to the34 way connector on the cable.
-
- ADFS files on 5.25 inch may now be transferred from drive one to drive zero
- as detailed in ADFS documentation. However, transferring data from DFS
- files on 5.25 inch to the 3.5 inch ADFS format requires a sideways RAM image
- of a 1770 DFS to be loaded into Sideways RAM on the Master Compact. Most
- Master Compact Welcome discs contain the file in the Library directory, but
- if the file is not there you may return your Welcome disc and get it
- updated, the address to return it to is:
-
- Customer Services
- Acorn Computers Ltd
- Fulbourn Road
- Cherry Hinton
- Cambridge
- CB1 4JN
-
- Once the DFS image has been loaded into sideways RAM, files may be
- transferred between DFS and ADFS, or ADFS and DFS using the Copyfiles
- program supplied on the Welcome disc.