M105 Address Selector: Difference between revisions
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==External links== | |||
* [http://www.bitsavers.org/pdf/dec/pdp11/handbooks/PDP11_PeripheralsHbk_1972.pdf pdp11 peripherals and interfacing handbook (1972 edition)] - the M105 is covered on pp. 213-214 (pp. 223-224 of the PDF) | |||
* [http://so-much-stuff.com/pdp8/flipchip/modules.htm FlipChip Modules] - Images and engineering drawings for FLIP CHIP modules | |||
** [http://svn.so-much-stuff.com/svn/trunk/Eagle/projects/DEC/Mxxx/M105/ M105] | |||
[[Category: UNIBUS]] | [[Category: UNIBUS]] | ||
[[Category: DEC Boards]] | [[Category: DEC Boards]] | ||
Revision as of 02:11, 28 November 2023
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.
External links
- pdp11 peripherals and interfacing handbook (1972 edition) - the M105 is covered on pp. 213-214 (pp. 223-224 of the PDF)
- FlipChip Modules - Images and engineering drawings for FLIP CHIP modules
