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The ROM contains vectors for interrupts, a table of routines that are callable from user
code and the code for driving the interface, and support routines. R O M layout is as
shown above, with a description of each section as follows.
The interrupt vectors are fixed in ROM, but provision has been made to allow the user
to revector them.
Example:
The command "setvect(26,#H10000);" sets the IRQ2 line to interrupt at address
#H10000.
The jump table is at a fixed location in memory. The table contains jump instructions to
a group of routines that are useful to the user. B y incorporating a supplied "include" file,
user code can call these routines as though they were in a library.
The breadboard code area contains support routines and the code f o r operating the
interface.
The upper part of ROM space is available for user code. Racal Instruments can load
user-supplied application code into this upper 64 K b o f the EPROM address space.
The customer will supply Racal Instruments with the data files encoded in a suitable
ASCII format, such as Motorola S-records.
4.3.2 R A M
RAM space is divided into the following general areas:
low memory #H400000-400FFF
#H401000-programmable - User Global Area
Programmable
Programmable
high memory
4-4
-
Breadboard System RAM
-
I/O Queues
-
Heap
-
Stack
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