IBM 5280 Distributed Data System - Index of

Device Control Write (KEYOP)Source: KEYOP (20 , BRa, BRb)Object: "",l_I ......,j1~-+-JO----:r..._1 C_7.,.....; .a.-I ~O ~I .,.....; _I~o I8 -' 15 ~ 2~ • ~1II Keyboard operation number: The number that the main microprocessorstores in the keyboard/display lOB starting at hex displacement 1 F.fJ Command address: The address of the binary register that contains, in thelow-order byte, the attachment command.o From address: The address,of the binary register that contains the main storageaddress of data to write into the external register, XR5.When this instruction is executed, external register 5 is loaded with the data at thespecified main storage address, external register 13 is loaded with the command.The command must be one of the following:Hex Value5A4A6B,7B,EB48C85FCommandLoad mar hiLoad mar 10Keyboard/display storage writeLoad configuration registerLoad sum registerLoad diagnostic control registerThis operation should be issued only for diagnostic programming in a dedicatedmode. Following this operation, the keyboard/display microprocessor ignores allkeystrokes, the interval timer, parity errors, and the extended sense register untilan ENTR command or keyboard operation other than 1 F, 20, 21, or 22 is executed.When a diagnostic operation is issued, there is a change in external register 13 beforethe operation is executed. The contents of external register 13 depends on thekeyboard/dispfay unit associated with the partition that issued the instruction, asfollows: for unit 1,40; for unit 2, CO; for unit 3, 44; for unit 4, C4. Register 25and bit 7 of register 26 should not be altered by the application program. Seenotes under keyboard operation hex 1 F.Object Code Instruction Format 291