HP 9830 User Manual

Hewlett-Packard
9830
Computer
Schematic
Contents
Section Assemblies Page
Title & Contents (this page) - N1
Notes - N2
Block Diagram - N3
CPU Clock 12 P1
CPU Microcode Sequencing 13 P2
CPU Microcode Controls 13, 83 P3
CPU Registers 14, 83 P4
CPU ALU 14, 83 P5
M Register & Memory Cycle Generator 82 M1
T Register & Memory R/W Busses 83, 03 M2
ROM Bank Selection 82, 25, 03 M3
ROM Addressing 82, 25, 03 M4
BASIC ROM 21 M5
ROM Cards & Cartridges 26, (RC) M6
RAM Bank Selection & Addressing 82 M7
RAM 4K Assembly 84 M8
I/O State Machine & Flag Sense 11, 12 F1
I/O Flags & Register, 9866 Interface 11, 02 F2
I/O Busses 11, 02 F3
NOTE
This schematic has been derived through
examination of the equipment.
This is not the manufacturer’s schematic.
© bhilpert / 2013
Contents (continued)
Section Assemblies Page
Keyboard Logic 32 K1
Keyboard 31, 32 K2
Display Scan Logic 42 D1
Display Column Drivers 41 D2
Display Characters Left-16 41 D3
Display Characters Right-16 41 D4
Tape Interface 61, 62 T1
Tape Command Decode 62, 61 T2
Tape Drive 64, 65 T3
Tape Data Clock 62 T4
Tape Read/Write 63, 65, 66 T5
Tape Read 63 T6
Power Supply 51 S1
IC Units List - A1
IC Types List, Calculations - A2
Signal Names - A3
Memory Map, Timing Diagrams - A4
Board Layout - Backplane - L1
Board Layout - CPU & Memory - L2
Board Layout - Devices & Power Supply - L3
Connectors - CPU & ROMS - L4
Connectors - Power Supply & Memory - L5
Connectors - Devices - L6
HP 9830 Computer
Section: Title & Contents
Page: N1 Rendition: 2014 Dec 26

HP 9830 Specifications

General

Model	9830
Category	Desktop
Release Year	1972
Memory (Base)	4 KB
Display Type	LED
Display (Characters per line)	32
Programming Language	BASIC
Type	Programmable Calculator
Memory	4 KB
Display	LED
Manufacturer	Hewlett Packard
CPU	Custom HP
Processor	Custom HP
Word Size	16 bits

Summary

System Overview

Block Diagram

Provides a high-level overview of the HP 9830 computer system architecture and major components.

CPU Core Components

CPU Clock Generation

Details the 8.000 MHz clock generation and I/O circuitry for the CPU.

CPU Microcode and Registers

Illustrates microcode sequencing, controls, and register operations.

CPU ALU

Details the Binary ALU, BCD ALU, and associated carry logic.

Memory System

Memory Registers and Control

Covers M/T registers, memory cycle generation, and bus operations.

ROM Organization

Details ROM bank selection, addressing, ROM cards, cartridges, and basic ROM.

RAM Organization

Illustrates RAM bank selection, addressing, and the 4KW RAM array.

I/O and Peripherals

I/O State Machine and Flags

Details the I/O state machine, flag sense, and I/O controls.

Keyboard Interface

Covers keyboard logic, scan, interconnect, and key data control.

Display System

Details display logic, column decoders, and character display circuitry.

Tape System

Covers tape interface, command decode, drive control, data clock, and read/write operations.

Power Supply and Reference

Power Supply Circuitry

Shows the power supply circuitry, including voltage regulation and filtering components.

Reference Information

Includes IC units list, types, calculations, signal names, memory map, and timing diagrams.

Board Layouts

Board Layout - Backplane

Shows the physical layout of the backplane, indicating connector positions and board locations.

Board Layout - Component Placement

Illustrates the physical layout of CPU, Memory, I/O, Display, Keyboard, Tape, and Power Supply boards.