HP 9830 User Manual

HP 9830 Computer
Section: Block Diagram
Page: N3 Rendition: 2014 Dec 26
Q Register - 16 bits
P Register - 16 bits
A Register - 16 bits
B Register - 16 bits
Binary ALU
(ROM 1)
E - 4 bits
BCD ALU
(ROM 2)
R-BUS
S-BUS
BCD
Carry FF
Binary
Carry FF
3
3
3
T-BUS
Processor Registers
Memory
Address
Memory
Write
Memory
Read
P Register = Program
Counter
Microcode
Address
Register
- 8 bits
Controls
8
4
4
Branch
Condition
Selector
Branch
Conditions
Microcode
ROM 5
Microcode
ROM 6
Microcode
ROM 7
Microcode
ROM 8
Microcode
ROM 9
Microcode
ROM 3
Microcode
ROM 4
Clock
Signals
8 MHz
Clock
Variable
Cycle
Generator
Microcode
Engine
SA
PA
SM
PM
PA / SA : Primary / Secondary Address
PM / SM : Address Modifier
Memory
Subsystem
RAM
Bank
Decoding
M Register -16 bits
RAM
2 * 4KW
BASIC ROM
7KW
BASIC II / 1KW
Cartridge ROMs
16
16
T Register -16 bits
Option ROMS
Memory
Cycle
State
Machine
Refresh
Counter
5
5
5
ROM
Bank
Decoding
6
9
15
3 * 1KW
5 * 1KW
8
14
8
10
I/O State Machine
& Command Decoding
I/O Subsystem
& Devices
DI / SI BUS
(Data / State In)
DO / SO / CO BUS
(Data / State / select-Code Out)
Alphanumeric LED
Display
Keyboard
@ Channel 16
& Select Code 12
Tape Drive
@ Select Code 10
9866 Printer
Interface
@ Select Code 15
Beeper
@ Channel 2
Display Enable
FF
@ Channel 8
Control Enable
FF
@ Channel 0/1
I/O Register - 16 bits
8+4
8+4+4
@ Various Select Codes
External I/O Slots
Service
Inhibit FF
Single
Service FF
CEO
CFI
SI0
SIH
SSI
CEO
Channel Devices
Select-Code Devices
QRD
FF
ALU
KLS
DEN
Interrupt
Control
A / B Select
FF
4
4

HP 9830 Specifications

General

Brand	HP
Model	9830
Category	Desktop
Language	English