System for transferring data between memories in a data-processi

Details System for transferring data between memories in a data-processi System for transferring data between memories in a data-processi

1986-12-10

1989-07-04

Shaw, Gareth D.

Boots, shoes, and leggings

3649426, 3649414, 36492381, G06F 900

Patent

active

048456560

ABSTRACT:
A data-processing apparatus provided with a bit boundary block transfer unit. A CPU forms a list of parameters required for transferring characters forming one block of text, and stores the list in a memory. A parameter control section of the boundary block transfer unit sequentially reads the parameters, and writes them in a parameter file. Meanwhile, the CPU processes the data. When the block of text has been transferred, an interrupt is supplied to the CPU. The CPU can form a list of only those parameters which must be changed for characters of the same type. These parameters are rewritten as the characters are transferred, one by one. In another data-processing apparatus of the invention, a CPU loads a register with data showing the type of characters to be transferred. It can input a variable parameter to a memory storing fixed parameters. When the variable parameter is set in both the memory and the register, a first selector selects one parameter for one character of the type specified by the data set in the register. This parameter is further selected by a second selector when the register stores said data. When the register does not store said data, the second selector selects the parameter for one character. Any parameter selected by the second selector is set in a parameter file. A data-transferring circuit transfers one character according to the parameter set in the parameter file.

REFERENCES:
patent: 4555775 (1985-11-01), Pike
patent: 4685070 (1987-08-01), Flinchbaugh
patent: 4700320 (1987-10-01), Kapur

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