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Codify reasons for assorted traps

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This commit is contained in:
Jeff 2016-09-28 15:35:22 -07:00 • committed by Jeff Parsons
commit c858fd0699
7 changed files with 375 additions and 295 deletions
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15
modules/pdp11/lib/bus.js
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@ -219,10 +219,18 @@ BusPDP11.IOController = {
var bus = this.controller;
var afn = bus.aIOHandlers[off];
if (afn) {
/*
* If a writeByte() handler exists, call it; we're done
*/
if (afn[1]) {
afn[1](b, addr);
return;
} else if (afn[3]) {
}
/*
* If a writeWord() handler exists, call the readWord() handler first to get the original data,
* then call writeWord() with the new data pre-inserted into the original data.
*/
if (afn[3]) {
w = afn[2]? afn[2](addr) : 0;
if (!(addr & 0x1)) {
afn[3]((w & ~0xff) | b, addr)
@ -232,6 +240,11 @@ BusPDP11.IOController = {
return;
}
} else if (addr & 0x1) {
/*
* If no handler existed, and this address was odd, then perhaps a handler exists for the even address;
* if so, call the readWord() handler first to get the original data, then call writeWord() with the new
* data pre-inserted into (the high byte of) the original data.
*/
afn = bus.aIOHandlers[off & ~0x1];
if (afn[3]) {
addr &= ~0x1;