Task file with automatic update of task file registers

Details Task file with automatic update of task file registers Task file with automatic update of task file registers

1991-07-31

1994-01-18

Robertson, David L.

Boots, shoes, and leggings

364DIG1, 3642601, 3642481, 3642362, G06F 900

Patent

active

052806022

ABSTRACT:
The present invention is a network which automates the operation of the IBM AT task file registers used in hard disk drives and hard disk controller systems that are compatible with the IBM AT BIOS (Basic Input/Output System). The present invention provides registers that interface between the disk controller circuit and the IBM AT computer. The network utilizes four 8-bit digital upcounters, one 4-bit digital upcounter, an 8-bit data register and a 4-bit data register. These counters indicate the physical address of the sector of data being transferred and are incremented or reloaded as required as each sector of data is transferred. The present invention employs the 8-bit data register, the maximum sector register, to hold the number of sectors and the 4-bit register, the maximum head register, to hold the number of heads on the disk drive. The counters are then reloaded or incremented as required based upon the contents of the maximum head and maximum sector registers without microprocessor support as each sector is transferred. External circuitry (typically a microprocessor) is not required in any of these operations. Having an automatic update of the AT task file is desirable for it reduces the command overhead and microprocessor band width requirement in supporting the AT task file.

REFERENCES:
patent: 3771143 (1973-11-01), Taylor
patent: 4425615 (1984-01-01), Swenson et al.
Intel Microsystem Components Handbook; Microprocessors and Peripherals, vol. II, 82062 Winchester Disk Controller, 1985, pp. 5-574 to 5-594.

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