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New PDP11 Device component can now register read/write handlers for selected I/O addresses

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This commit is contained in:
Jeff Parsons 2016-09-20 14:53:09 -07:00 • committed by Jeff Parsons
commit 1c9ea6445b
12 changed files with 666 additions and 376 deletions
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18
modules/pdp11/lib/memory.js
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@ -132,15 +132,15 @@ function MemoryPDP11(addr, used, size, type, controller)
}
/*
* When a controller is specified, the controller must provide a buffer,
* via getMemoryBuffer(), and memory access functions, via getMemoryAccess().
* When a controller is specified, the controller must provide a buffer, via getControllerBuffer(),
* and memory access functions, via getControllerAccess().
*/
if (controller) {
this.controller = controller;
var a = controller.getMemoryBuffer(addr);
var a = controller.getControllerBuffer(addr);
this.adw = a[0];
this.offset = a[1];
this.setAccess(controller.getMemoryAccess());
this.setAccess(controller.getControllerAccess());
return;
}
@ -189,8 +189,8 @@ function MemoryPDP11(addr, used, size, type, controller)
* disabling writes. VIDEO is treated exactly like RAM, unless a controller is provided. Both RAM and
* VIDEO memory are always considered writable, and even ROM can be written using the Bus setByteDirect()
* interface (which in turn uses the MemoryPDP11 writeByteDirect() interface), allowing the ROM component to
* initialize its own memory. The CTRL type is used to identify memory-mapped devices that do not need
* any default storage and always provide their own controller.
* initialize its own memory. The CONTROLLER type is used to identify memory-mapped devices that do not
* need any default storage and always provide their own controller.
*
* Unallocated regions of the address space contain a special memory block of type NONE that contains
* no storage. Mapping every addressible location to a memory block allows all accesses to be routed in
@ -198,8 +198,8 @@ function MemoryPDP11(addr, used, size, type, controller)
*
* These types are not mutually exclusive. For example, VIDEO memory could be allocated as RAM, with or
* without a custom controller (the original Monochrome and CGA video cards used read/write storage that
* was indistinguishable from RAM), and CTRL memory could be allocated as an empty block of any type, with
* a custom controller. A few types are required for certain features (eg, ROM is required if you want
* was indistinguishable from RAM), and CONTROLLER memory could be allocated as an empty block of any type,
* with a custom controller. A few types are required for certain features (eg, ROM is required if you want
* read-only memory), but the larger purpose of these types is to help document the caller's intent and to
* provide the Control Panel with the ability to highlight memory regions accordingly.
*/
@ -208,7 +208,7 @@ MemoryPDP11.TYPE = {
RAM: 1,
ROM: 2,
VIDEO: 3,
CTRL: 4,
CONTROLLER: 4,
COLORS: ["black", "blue", "green", "cyan"],
NAMES: ["NONE", "RAM", "ROM", "VID", "H/W"]
};