Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
set-vector macro interrupt ,seg-addr,off-addr
push d5
mov ax,seg-addr
mov d5 ,ax
mov dx,off-addr
mov a1,interrupt
mov ah,25H
int 21 H
POP d5
endm
ran-block-read macro fcb,count,rec-size
mov dx,offsetfcb
mov cx ,count
mov wordptr fcb[EEHl,rec-size
mov ah,27H
int 21
H
endm
ran-block-writemacro fcb,count,rec_5ize
mov dx,offsetfcb
moc cx ,count
mov wordptr fcb[EEHI,rec-5ize
mov ah, 28H
int 21
H
endm
parsemacro string,fcb
mov 5i,offset
string
mov di,offsetfcb
pu5h e5
push d5
POP e5
mov al,EFH
mov ah,29H
int 21 H
POP e5
endm
get-datemacro
mov ah ,2AH
int 21 H
endm
5et_datemacroyear,month,day
mov cx,year
mov dh ,month
mov dl ,day
rnov ah,2BH
int
21 H
endm
;SET-VECTOR
;function25H
;RAN-BLOCK-READ
;function27H
;RAN-BLOCK-WRITE
;function 28H
;PARSE
;function 29H
;GET-DATE
;function2AH
;SET-DATE
;function2BH
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Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200