Difference between revisions of "MRV11-D Universal Programmable Read-Only Memory"

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The entire ROM contents were either directly visible on the QBUS, or through two independent 2KB windows (somewhat like later, larger [[UNIBUS]] ROM cards). The MRV11-A was a [[DEC card form factor|dual]]-height card, the '''M8578'''.
 
The entire ROM contents were either directly visible on the QBUS, or through two independent 2KB windows (somewhat like later, larger [[UNIBUS]] ROM cards). The MRV11-A was a [[DEC card form factor|dual]]-height card, the '''M8578'''.
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==Boot ROM usage==
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You can use the [[MXV11]]-B2 ROM chip set ([https://github.com/larsbrinkhoff/DECROMs 23-145E4-00 / 23-146E4-00]) to convert the MRV11-D into a boot module for [[QBUS]] [[PDP-11]]s capable of booting from:
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* [[RL01]] / [[RL02]] (DL)
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* [[RX01]] / [[RX02]] (DX,DY)
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* [[TU58]] (DD)
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* [[TSV05]] (MS)
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* [[MSCP]] type Devices e.g. [[RD51]], [[RX50]] (DU)
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* [[DECnet]] via [[DPV11, [[DLV11-E]], [[DLV11-F]], [[DUV11]]
  
 
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Revision as of 11:51, 26 August 2024

The MRV11-D Universal Programmable Read-Only Memory was a QBUS ROM card. It held up to sixteen 28-pin chips; these could be either ROMs/PROMs/EPROMs (of up to 8-bit x 32K size), or static RAMs. It thus held up to 512KB when fully populated. Configuration is done with a combination of jumpers and two DIP switches.

The entire ROM contents were either directly visible on the QBUS, or through two independent 2KB windows (somewhat like later, larger UNIBUS ROM cards). The MRV11-A was a dual-height card, the M8578.

Boot ROM usage

You can use the MXV11-B2 ROM chip set (23-145E4-00 / 23-146E4-00) to convert the MRV11-D into a boot module for QBUS PDP-11s capable of booting from:

See also

External links

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