Difference between revisions of "M105 Address Selector"
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The '''M105 Address Selector''' is a [[Digital Equipment Corporation|DEC]] [[FLIP CHIP]] which implements the '[[address]] selection' function (i.e. detecting when a particular [[bus]] cycle is destined for a particular [[peripheral|device]]) for the [[UNIBUS]]. | The '''M105 Address Selector''' is a [[Digital Equipment Corporation|DEC]] [[FLIP CHIP]] which implements the '[[address]] selection' function (i.e. detecting when a particular [[bus]] cycle is destined for a particular [[peripheral|device]]) for the [[UNIBUS]]. | ||
| − | It was used, along with an [[M782 Interrupt Control]], in early [[PDP-11]] [[device controller]]s which plugged into an [[Small Peripheral Controller|SPC]] slot. It was also used in a number of early devices which were built out of a custom [[backplane]] and a large number of FLIP CHIPs, such as the [[RK11|RK11-C]]. Some later devices which no longer used a large number of small Flip Chips (such as the [[TM11|TMB11]]) also used it. | + | It was used, along with an [[M782 Interrupt Control]], in early [[PDP-11]] [[device controller]]s which plugged into an [[Small Peripheral Controller|SPC]] slot. It was also used in a number of early devices which were built out of a custom [[backplane]] and a large number of FLIP CHIPs, such as the [[RK11-C disk controller|RK11-C]]. Some later devices which no longer used a large number of small Flip Chips (such as the [[TM11 magtape controller|TMB11]]) also used it. |
The board contained a number of [[jumper]]s which could be use to set the address to be recognized; the jumpers apply to UNIBUS address [[bit]]s 3-12. The M105 recognizes any address within a eight byte block; if a device needs more than 4 [[word]] [[register]]s, the M105 cannot accomplish that. | The board contained a number of [[jumper]]s which could be use to set the address to be recognized; the jumpers apply to UNIBUS address [[bit]]s 3-12. The M105 recognizes any address within a eight byte block; if a device needs more than 4 [[word]] [[register]]s, the M105 cannot accomplish that. | ||
Revision as of 11:54, 28 January 2021
The M105 Address Selector is a DEC FLIP CHIP which implements the 'address selection' function (i.e. detecting when a particular bus cycle is destined for a particular device) for the UNIBUS.
It was used, along with an M782 Interrupt Control, in early PDP-11 device controllers which plugged into an SPC slot. It was also used in a number of early devices which were built out of a custom backplane and a large number of FLIP CHIPs, such as the RK11-C. Some later devices which no longer used a large number of small Flip Chips (such as the TMB11) also used it.
The board contained a number of jumpers which could be use to set the address to be recognized; the jumpers apply to UNIBUS address bits 3-12. The M105 recognizes any address within a eight byte block; if a device needs more than 4 word registers, the M105 cannot accomplish that.
