Tandy PC-6 User Manual

LSI
Main CPU
HD61747B20
Sub CPU
HD61747B25
Gate Array
MB64H193
RAM
HM6264ALFP-5Q,
BASIC control, Key signal input/output (lower keyboard), 1st to 6th digits and
13th to 18th digits display control.
Calculation, I/O control, key signal input/output (upper keyboard), 7th to
12th digits and 19th to 24th digits display control.
Interface between CPU and RAM, buzzer control.
Stores data and program. RAM has 8K bytes (64K bits) capacity and contains
a self-control circuit.
Ram Map
LSI
ROM
RAM
CPU (Main)
HD61747B20
113024 bits
1896 bits
CPU (Sub)
HD61747B25
113024 bits
1896 bits
RAM
~
HM6264ALFP-50
65536 bits
TOTAL
226056 bits 69328 bits
I nput Buffer
Code Buffer
PH
POT
MFT ST
P5T
P4T
P3T
P2T
P9T
P8T
P7T
P6T
OP
RAM
Variable B
P9B
READ#No.
DATA#P
DATA P
P#X
IN-
KEY
I
Address
P#
GOSUB STACK
DISP Buffer
xD
yD
P#
Varia-
ble No
STEP
P# I~aria-
Address
ble No.
000
080
FOR NEXT
-5-
I P# I~aria-)j
ble No
P# l~aria-..1
ble No.
PASS
I
I
PRT I
DEFM IMODEI
Address k
j i
Users Area
Communication Buffer
Variable check
I
$
FF I
100
180

Tandy PC-6 Specifications

General

Brand	Tandy
Model	PC-6
Category	Calculator
Language	English