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## Chapter 7
The GO32 unit

This chapter of the documentation describe the GO32 unit for the Free Pascal compiler under D O S. It was donated by Thomas Schatzl (tom__at__work@geocities.com), for which my thanks. This unit was first written for D O S by Florian Kl”ampfl. This chapter is divided in four sections. The first two sections are an introduction to the GO32 unit. The third section lists the pre-defined constants, types and variables. The last section describes the functions which appear in the interface part of the GO32 unit.

7.1 Introduction
7.2 Protected mode memory organization
What is DPMI
Selectors and descriptors
FPC specialities
dos memory access
I/O port access
Processor access
Interrupt redirection
Handling interrupts with DPMI
Protected mode interrupts vs. Real mode interrupts
Creating own interrupt handlers
Disabling interrupts
Hardware interrupts
Software interrupts
Real mode callbacks
7.3 Types, Variables and Constants
Constants
Predefined types
Variables.
7.4 Functions and Procedures
allocate____ldt____descriptors
allocate____memory____block
copyfromdos
copytodos
create____code____segment____alias____descriptor
disable
dosmemfillchar
dosmemfillword
dosmemget
dosmemmove
dosmemput
enable
free____ldt____descriptor
free____memory____block
free____rm____callback
get____cs
get____descriptor____access____rights
get____ds
get____linear____addr
get____meminfo
get____next____selector____increment____value
get____page____size
get____pm____interrupt
get____rm____callback
get____rm____interrupt
get____run____mode
get____segment____base____address
get____segment____limit
get____ss
global____dos____alloc
global____dos____free
inportb
inportl
inportw
lock____code
lock____data
lock____linear____region
outportb
outportl
outportw
realintr
seg____fillchar
seg____fillword
segment____to____descriptor
seg____move
set____descriptor____access____rights
set____pm____interrupt
set____rm____interrupt
set____segment____base____address
set____segment____limit
tb____size
transfer____buffer
unlock____code
unlock____data
unlock____linear____region

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