Page printer

Details Page printer Page printer

1989-04-28

1990-08-28

Evans, Arthur G.

Boots, shoes, and leggings

3642391MS, 364200, G06F 1500

Patent

active

049531034

ABSTRACT:
A page printer with an internal CPU, interrupt controller, and DMAC has a DMA stopping circuit in the DMAC, the function of which is to stop a DMA transfer in response to a DMA stop signal and restart it in response to a DMA restart signal. The DMA signal is generated by the interrupt controller when it receives certain interrupt requests, such as communication interrupt requests, enabling the CPU to service these requests promptly. The DMA restart signal is generated at the end of the interrupt service routine. This arrangement permits DMA transfers to be performed in burst mode, stopping only when urgent interrupt service is required. Burst-mode DMA improves the speed of operation of the printer.

REFERENCES:
patent: 4729107 (1988-03-01), Hasegawa
patent: 4757462 (1988-07-01), Sato et al.

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