JPS5624625A - Automatic initial program load system - Google Patents

Automatic initial program load system

Info

Publication number
JPS5624625A
JPS5624625A JP9872779A JP9872779A JPS5624625A JP S5624625 A JPS5624625 A JP S5624625A JP 9872779 A JP9872779 A JP 9872779A JP 9872779 A JP9872779 A JP 9872779A JP S5624625 A JPS5624625 A JP S5624625A
Authority
JP
Japan
Prior art keywords
ipl
main memory
read
data
function
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9872779A
Other languages
Japanese (ja)
Inventor
Kunihiko Onuma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9872779A priority Critical patent/JPS5624625A/en
Publication of JPS5624625A publication Critical patent/JPS5624625A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To easily follow the change of the machine type of I/O without exclusively using the main memory space for ROM, by taking the data to the main memory by IPL read function from ROM.
CONSTITUTION: The microprogram sets such instruction as to make general I/O non-responsive to the function register 8, that is, IPL (Initial Program Load) read instruction is set to perform the data transfer. Then, IPL function decoder 40 detects this IPL read instruction and outputs the receiving signal 40b and DVA (Device Address) specifying signal Ie-1 of IPL object I/O module 12 and AND are taken to make effective ROM44 in which IPM program is stored and IPL istruction of one word read from ROM44 is stored in the main memory 11 through the data buffer 46 and the data bus 1b. The above mentioned procedure is repeated.
COPYRIGHT: (C)1981,JPO&Japio
JP9872779A 1979-08-03 1979-08-03 Automatic initial program load system Pending JPS5624625A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9872779A JPS5624625A (en) 1979-08-03 1979-08-03 Automatic initial program load system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9872779A JPS5624625A (en) 1979-08-03 1979-08-03 Automatic initial program load system

Publications (1)

Publication Number Publication Date
JPS5624625A true JPS5624625A (en) 1981-03-09

Family

ID=14227548

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9872779A Pending JPS5624625A (en) 1979-08-03 1979-08-03 Automatic initial program load system

Country Status (1)

Country Link
JP (1) JPS5624625A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49122241A (en) * 1973-03-22 1974-11-22
JPS524138A (en) * 1975-06-30 1977-01-13 Hitachi Ltd Initial program writing system of calculator
JPS5344134A (en) * 1976-10-04 1978-04-20 Oki Electric Ind Co Ltd Microprogram control system
JPS5437646A (en) * 1977-08-31 1979-03-20 Toshiba Corp Program loading system
JPS5472642A (en) * 1977-11-22 1979-06-11 Toyoda Machine Works Ltd Program writer for computer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49122241A (en) * 1973-03-22 1974-11-22
JPS524138A (en) * 1975-06-30 1977-01-13 Hitachi Ltd Initial program writing system of calculator
JPS5344134A (en) * 1976-10-04 1978-04-20 Oki Electric Ind Co Ltd Microprogram control system
JPS5437646A (en) * 1977-08-31 1979-03-20 Toshiba Corp Program loading system
JPS5472642A (en) * 1977-11-22 1979-06-11 Toyoda Machine Works Ltd Program writer for computer

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