HP 1LY4-0302 Burnni ERS Feb90 free download

File name 1LY4-0302_Burnni_ERS_Feb90.pdf

r/iO- HEWLETT a!~ PACKARD CONTENTS 1. General. . 4 1.1 Features 4 1.2 Pin List 5 1.3 Pin Description . . 9 1.4 Electrical Specifications 15 2. LAN Support . . . 17 3. NEW I/O Capabilities . 18 3.1 Overview . . . . 18 3.2 Primary ID /Reset Register . . . . 19 3.3 Status/First ARM Control Register 19 3.4 Extended ID /Second Arm Control Register 20 3.5 Bus Error Timeout Control Register 21 3.6 Scratch Register. . . . . . . . . 22 3.7 PTM/Expanded BOOT ROM Control Register . 22 3.8 Timing. . . . . . 23 4. PROGRAMMABLE TIMER 28 4.1 Features . . . . . 28 4.2 Power Up Initialization 28 4.3 Memory Map 29 4.4 Control . . . . . 30 4.5 Timing. . . . . . 31 5. BOOT ROM and TEST LED Support 34 5.1 BOOT ROM and TEST LED Signals 34 5.2 Timing. . . . . 34 6. Keyboard System Support 37 6.1 Keyboard Signals 37 6.2 Timing. . . 38 7. Buffer Control. . . 41 7.1 Control Signals 41 8. TEST MODES 43 8.1 Introduction 43 8.2 Initialization .