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Fixed RTI on older PDP-11s (ie, 11/20); the old RTI behaves like the new RTT, which did not exist on older machines

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Jeff 2016-11-13 21:17:46 -08:00 • committed by Jeff Parsons
commit 0607d65b70
8 changed files with 163 additions and 140 deletions
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4
modules/pdp11/lib/serialport.js
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@ -662,12 +662,12 @@ SerialPortPDP11.prototype.readXCSR = function(addr)
SerialPortPDP11.prototype.writeXCSR = function(data, addr)
{
/*
* If the device is READY, and TIE is being set, then request an interrupt.
* If the device is READY, and TIE is being set, then request a hardware interrupt.
*
* Conversely, if TIE is being cleared, remove the request; this satisfies a test in MAINDEC TEST 15,
* which appears to clear, set, and clear the Transmitter Interrupt Enable (TIE) bit in rapid succession,
* with the expectation that NO interrupt will be generated. However, this fix also required a
* complementary change in setTrigger(), to signal an interrupt using INTQ_DELAY rather than INTQ.
* complementary change in setTrigger(), to request hardware interrupts with INTQ_DELAY rather than INTQ.
*/
if (this.xcsr & PDP11.DL11.XCSR.READY) {
if (data & PDP11.DL11.XCSR.TIE) {