Hardware; Organisation - Husky MP2500 Manual

31. Hardware

This chapter describes the MP2500 hardware in sufficient detail to enable
you to write programs to control the hardware directly, if you should need to.
It will also help you anticipate or diagnose any problems with using software
produced for a standard IBM PC-compatible.
It does not provide sufficient information for you to design internal hardware
or modify MP2500 hardware. For this level of information, contact H
For pinouts and other interfacing information, see Appendix F.

31.1 Organisation

The MP2500 hardware has been designed to satisfy two main aims:
1 Provide the convenience of hand-held operation, in a wide variety of
arduous working conditions.
2 Provide a hardware environment similar to a desktop computer, so that
programs can be conveniently designed and tested on an IBM PC.
The configuration emulated is an IBM PC-AT with CGA graphics adaptor.
The MP2500 design also includes a number of non-standard devices,
namely the LCD, electroluminescent backlight, LCD contrast adjustment
and power regulation and monitoring system. There is little or no advantage
in direct access to these devices, so their hardware implementation will not
be described here; use the BIOS interrupts to access these devices (see
Chapter 18.2).
The memory map, hardware interrupts and device emulation details are
described in this chapter. For many purposes, the facilities provided by
BIOS interrupts will be more convenient (these are summarised in Chapter
18.2 and detailed in Chapters 20 to 30).
Chapter 31: Hardware
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