Tandy 1000 User Manual

Basic
USR[number](argument)
Calls a user's assembly-language subroutine identified by number
and passes argument to that subroutine.
The
number you specify must be the same as the corresponding DEF
USR statement for that routine. Default
= 0.
VAL(string)
Calculates the numerical value of string.
PRINT VAL("100") PRINT VAL("1234E5")
VARPTR (variable)
VARPTR ([#]buffer)
Returns the offset into BASIC's data segment of a variable or a disk
buffer.
When used with
variable, VARPTR returns the address of the first
byte of data identified with variable.
When used with buffer, VARPTR returns the address of the file's
control block. The number sign
(#) is not required.
PRINTVARPTR(3) A=VARPTR(A$)
VARPTR$(variable)
Returns a 3-byte string representing a memory address of a variable:
Byte
0 = type
Byte 1 = low byte of address
Byte 2 = high byte of address
Type
is 2 for integer variables, 3 for string variables, 4 for single
precision variables, and 8 for double precision variables.
A$ = VARPTR$(A!)
Tandy 1000 69

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