Introduction 1.3.5 The keyboard The keyboards of the ACW and the BBC Microcomputer Master are similar, differing only in layout. The features of the keyboards are outlined in the Cambridge Workstation Welcome Guide Part No. 0420,000. 1.3.6 Auto-Repetition Most keys auto-repeat; the exceptions are (ESCAPE) , (CTRL) , (SHIFT), (CAPS LOCK) , (SHIFT LOCK) and the function keys. The auto-repeat rate and the delay before auto-repetition can be set by the Panos Configure utility. 1.3.7 Caps Lock The state of (CAPS LOCK) on entering Panos can be set by the configure utility. 1.3.8 The BREAK Button or Key This will force a return to the Pandora operating system kernel.
The (BREAK) button is useful if a program gets stuck in a loop that cannot be left by pressing the (ESCAPE) key. Pressing the (BREAK) button alone gives a 'soft reset' which neither clears the definitions of the user-defined keys, nor resets the system clock. Pressing ( CTRL) (BREAK) gives a 'hard reset' which clears these. 1.4 Function Keys By default these have no effect, but the function keys may be programmed to produce either a string of characters, or a single code. For some functions, the (BREAK) key, the (COPY) key and the cursor movement keys can be considered 'soft' keys. In this case, these keys may be treated as function keys numbered from 10 to 15, as follows:
BREAK f10 COPY f 11 f12 --> f13 f14 f15 1.5 ACW Keypad The ACW's separate numeric keypad forms part of the keyboard. Normally these keys return the same codes as the equivalent keys on the main keyboard. However, it is possible to map the codes onto different values. See the 110 Processor User Guide. 1.5.1 The TUBE Switch The two ACW processors (32016 and 6512) communicate across the Acorn TUBE. For normal operation, the TUBE rocker switch on the back of the keyboard unit is set to dual processor mode. The TUBE indicator light comes on when the ACW is powered up, confirming that both the 32016 and 6512 processors are operating.
If the TUBE switch is moved to single processor mode, only the 6512 processor will operate. 1.6 Software overview ACW SERVICE MANUAL Issue 1 7