| 摘要 |
1,267,582. Digital computers; interrupt mask. BURROUGHS CORP. 17 March, 1969 [15 March, 1968], No. 13825/69. Heading G4A. A multi-module data processing system has a mask register within each central processing module which selectively prevents specified stored interrupt signals, received from the other modules, from interrupting the normal operation of the central processing module and means for preventing interrupts allowed by the mask from interrupting the central processing module. Each processing module is identical and operates in a normal mode asynchronously in parallel under an executive scheduling programme (ESP). Up to 70 different interrupt signals can be received and stored by an interrupt condition register 6-10, there being means for preventing the same two signals being received from different modules simultaneously. The ESP controls, for each processor, the 70 bi-stable individual mask registers 6-12 that determine which conditions are allowed to interrupt that processor. If the two correspond for that signal, an interrupt is generated from AND gates 6-14 which causes storing of the basic information for normal mode program resumption, and the processor enters control mode 1. In this control mode 1, certain fewer interrupts are allowed and the mode is shifted from the control mode back to the normal mode under control of the control mode 1 and the normal mode programme continues to run without being automatically interrupted (subject to mask) as it was when it was originally in the normal mode. Also it is stated that the machine can effectively change its mode from the control mode back to the normal mode without actually leaving the ESP programme. A control mode 2 is also provided if control mode 1 is interrupted and if control mode 2 is interrupted the operation stops as shown on Fig. 6. Other features mentioned include simple parity bit checking, 512 simplex I/O lines including magnetic tape and card readers, teletype lines &c. and high speed thin film memories. The calculating parts can perform the four rules of arithmetic and may be used on accounting problems. |
