Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
get-timemacro
mov ah,2CH
int 21 H
endm
;GET-T IME
;function 2CH
;SET-TIME
set-time macro hour,minute5,5econds,hundredths
mov ch,hour
mov c1,minutes
mov dh,seconds
mov d1,hundredths
mov ah,2DH ;function2DH
int 21 H
endm
verifymacro switch
mov allswitch
mov ah ,2EH
int 21 H
endm
General
;VERIFY
:functionPEH
mov-string macro source,destination,num_bytes
push
mov
mov
assume
mov
mov
mov
assume
POP
endm
rep movs
convert macro
local
imp
table db
start: mov
xor
xor
div
mov
mov
mov
mov
mov
mov
endm
;MOV-STRING
e5
ax,ds
es,ax
es:data
si,offset source
di,offset destination
cx,num-bytes
es:destination,source
es:nothing
e5
value,base,destination ;CONVERT
table,start
start
"0 123456789ABCDEF"
a1 ,value
ah,ah
bx, bx
base
bl,al
al,cs:table[bxl
destination,al
bl ,ah
al,cs:tableIbxl
destinationIl1,al
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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