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Fixed the memory clear "toggle-in", by returning the correct amount of installed RAM, and passing properly masked addresses to all the I/O handlers

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Jeff 2016-11-04 17:09:50 -07:00 • committed by Jeff Parsons
commit 0cf11c0b01
8 changed files with 605 additions and 511 deletions
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14
modules/pdp11/lib/device.js
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@ -38,6 +38,7 @@ if (NODE) {
var Component = require("../../shared/lib/component");
var State = require("../../shared/lib/state");
var BusPDP11 = require("./bus");
var MemoryPDP11 = require("./memory");
var MessagesPDP11 = require("./messages");
var PC11 = require("./pc11");
var RL11 = require("./rl11");
@ -854,13 +855,24 @@ DevicePDP11.prototype.writeCTRL = function(data, addr)
/**
* readSIZE(addr)
*
* We're adhering to DEC's documentation, which says:
*
* This read-only register specifies the memory size of the system. It is defined to indicate the
* last addressable block of 32 words in memory (bit 0 is equivalent to bit 6 of the Physical Address).
*
* Looking at the Memory Clear "toggle-in" code in /devices/pdp11/machine/1170/panel/debugger/README.md, the
* memory loop gives up when the block number stored in KIPAR0 is >= LSIZE, suggesting that LSIZE is actually
* the total number of 64-byte blocks, rather than the block number of the last block. But that code is
* not conclusive, since it writes 8192 bytes at a time rather than 64, so it doesn't really matter if LSIZE
* is off by one.
*
* @this {DevicePDP11}
* @param {number} addr (eg, PDP11.UNIBUS.LSIZE--HSIZE or 177760--177762)
* @return {number}
*/
DevicePDP11.prototype.readSIZE = function(addr)
{
return addr == PDP11.UNIBUS.LSIZE? ((BusPDP11.MAX_MEMORY >> 6) - 1) : 0;
return addr == PDP11.UNIBUS.LSIZE? ((this.bus.getMemorySize(MemoryPDP11.TYPE.RAM) >> 6) - 1) : 0;
};
/**