RH750 Massbus Adapter - Revision history

Jnc: /* External links */ +VAX-11/750 Installation Manual

2024-05-17T18:13:17Z

‎External links: +VAX-11/750 Installation Manual

Jnc: Add board name

2024-05-16T23:46:34Z

Add board name

Jnc: +MASSBUS Adapter image

2024-05-16T23:43:43Z

+MASSBUS Adapter image

Jnc: Move to more specific cat

2024-05-15T15:02:14Z

Move to more specific cat

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2024-05-07T00:07:54Z

Move to new cat

Jnc: /* See also */ +VAX Hardware Handbook

2022-06-05T23:03:48Z

‎See also: +VAX Hardware Handbook

Jnc: CMI config info is not RH750-specific - move to general /750 page

2022-06-02T02:04:17Z

CMI config info is not RH750-specific - move to general /750 page

Jnc: /* See also */ +EK-RH750-TD; use Bitsavers copy of FMPS

2022-05-28T12:10:23Z

‎See also: +EK-RH750-TD; use Bitsavers copy of FMPS

Jnc: remoe duplicate text; fix typo

2022-05-28T12:04:55Z

remoe duplicate text; fix typo

Vaxorcist: Frist Draft ...

2022-05-24T18:57:38Z

Frist Draft ...

New page

The '''RH750 Massbus Adapter''' was a [[MASSBUS]] [[device controller]] for the [[VAX-11/750]]'s [[CPU Memory Interconnect | CPU Memory Interconnect (CMI)]].

It was implemented on one [[DEC card form factor|extented hex]] card, which mounts in the VAX-11/750 [[backplane]] in one of the three CMI option slots.

A VAX-11/750 could have up to three RH750 Adapters, the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7.

It was common practice to have two separate RH750s, one for tape and another for disk devices.
Combining both on one RH750 was possible, but tape usage had a negative impact on disk performance.

== CMI Option Slot Configuration Rules ==

CMI option slots can be used for other adapters, too:

* [[CI750 Computer Interconnect Interface | CI750 Computer Interconnect Interface (CI)]]
* [[DW750 Second Unibus Interface]]
* [[DR750 Parallel Interface]]

Allowable Configurations of CMI Slots 7, 8, & 9:
{| class="wikitable"
! Slot 7 !! Slot 8 !! Slot 9
|-
| RH750 || RH750 || RH750
|-
| DW750 || RH750 || RH750
|-
| DR750 || RH750 || RH750
|-
| DW750 || DR750 || RH750
|-
| DW750 || CI750 || RH750
|-
| CI750 || RH750 || RH750
|}

'''NOTES:'''
# Combination of DR750 and CI750 is not allowed
# Only one DR750 per system is allowed
# Only one DW750 per system is allowed
# Only one CI750 per system is allowed

== External links ==

* [http://storage.datormuseum.se/u/96935524/Datormusuem/VAX11-750/MP01045_RH750_Feb81.pdf RH750 Field Maintenance Print Set] (MP-01045)

[[Category: VAXen]]
[[Category: MASSBUS Controllers]]
The '''RH750 Massbus Adapter''' was a [[MASSBUS]] [[device controller]] for the [[VAX-11/750]]'s [[CPU Memory Interconnect | CPU Memory Interconnect (CMI)]].

It was implemented on one [[DEC card form factor|extented hex]] card, which mounts in the VAX-11/750 [[backplane]] in one of the three CMI option slots.

A VAX-11/750 could have up to three RH750 Adapters, the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7.

It was common practice to have two separate RH750s, one for tape and another for disk devices.
Combining both on one RH750 was possible, but tape usage had a negative impact on disk performance.

== CMI Option Slot Configuration Rules ==

CMI option slots can be used for other adapters, too:

* [[CI750 Computer Interconnect Interface | CI750 Computer Interconnect Interface (CI)]]
* [[DW750 Second Unibus Interface]]
* [[DR750 Parallel Interface]]

Allowable Configurations of CMI Slots 7, 8, & 9:
{| class="wikitable"
! Slot 7 !! Slot 8 !! Slot 9
|-
| RH750 || RH750 || RH750
|-
| DW750 || RH750 || RH750
|-
| DR750 || RH750 || RH750
|-
| DW750 || DR750 || RH750
|-
| DW750 || CI750 || RH750
|-
| CI750 || RH750 || RH750
|}

'''NOTES:'''
# Combination of DR750 and CI750 is not allowed
# Only one DR750 per system is allowed
# Only one DW750 per system is allowed
# Only one CI750 per system is allowed

== External links ==

* [http://storage.datormuseum.se/u/96935524/Datormusuem/VAX11-750/MP01045_RH750_Feb81.pdf RH750 Field Maintenance Print Set] (MP-01045)
* [https://oldcomputers.dyndns.org/public/pub/rechner/dec/manuals/decimages/750f.pdf VAX-11/750 F Field Maintenance Print Set] (MP-01377)

[[Category: VAXen]]
[[Category: MASSBUS Controllers]]

@@ Line 5: / Line 5: @@
 It was common practice to have two separate RH750s, one for [[magnetic tape|tape]], and another for [[disk]] devices. Combining both on one RH750 was possible, but tape usage had a negative impact on disk performance.
-==See also==
+==Further reading==
 * ''RH750 Massbus Adapter Technical Description'' (EK-RH750-TD) - not available online
@@ Line 12: / Line 12: @@
 ==External links==
 * [http://www.bitsavers.org/pdf/dec/vax/750/MP01045_RH750_Engineering_Drawings_198102.pdf RH750 Field Maintenance Print Set] (MP-01045)
 * [https://web.archive.org/web/20071004184551/http://computer-refuge.org/compcollect/dec/vax/11750/L0007-big.jpg L0007 (MBA)] - MASSBUS Adapter image

@@ Line 1: / Line 1: @@
 The '''RH750 Massbus Adapter''' was a [[MASSBUS]] [[device controller]] for the [[VAX-11/750]]'s [[CPU/Memory Interconnect]] (CMI).
-It was implemented on one [[DEC card form factor|extended hex]] card, the ,which mounts in the VAX-11/750 [[backplane]] in one of the three [[VAX-11/750#Backplane_configuration|CMI option slots]]. A VAX-11/750 could have up to three RH750 Adapters; the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7.
+It was implemented on one [[DEC card form factor|extended hex]] card, the L0007 MASSBUS Adapter (MBA), which mounts in the VAX-11/750 [[backplane]] in one of the three [[VAX-11/750#Backplane_configuration|CMI option slots]]. A VAX-11/750 could have up to three RH750 Adapters; the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7.
 It was common practice to have two separate RH750s, one for [[magnetic tape|tape]], and another for [[disk]] devices. Combining both on one RH750 was possible, but tape usage had a negative impact on disk performance.

@@ Line 1: / Line 1: @@
 The '''RH750 Massbus Adapter''' was a [[MASSBUS]] [[device controller]] for the [[VAX-11/750]]'s [[CPU/Memory Interconnect]] (CMI).
-It was implemented on one [[DEC card form factor|extended hex]] card, which mounts in the VAX-11/750 [[backplane]] in one of the three [[VAX-11/750#Backplane_configuration|CMI option slots]]. A VAX-11/750 could have up to three RH750 Adapters; the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7.
+It was implemented on one [[DEC card form factor|extended hex]] card, the ,which mounts in the VAX-11/750 [[backplane]] in one of the three [[VAX-11/750#Backplane_configuration|CMI option slots]]. A VAX-11/750 could have up to three RH750 Adapters; the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7.
 It was common practice to have two separate RH750s, one for [[magnetic tape|tape]], and another for [[disk]] devices. Combining both on one RH750 was possible, but tape usage had a negative impact on disk performance.
@@ Line 13: / Line 13: @@
 * [http://www.bitsavers.org/pdf/dec/vax/750/MP01045_RH750_Engineering_Drawings_198102.pdf RH750 Field Maintenance Print Set] (MP-01045)
 [[Category: CMI]]
 [[Category: MASSBUS Controllers]]

@@ Line 1: / Line 1: @@
 The '''RH750 Massbus Adapter''' was a [[MASSBUS]] [[device controller]] for the [[VAX-11/750]]'s [[CPU/Memory Interconnect]] (CMI).
-It was implemented on one [[DEC card form factor|extended hex]] card, which mounts in the VAX-11/750 [[backplane]] in one of the three [[VAX-11/750#CMI_backplane_configuration|CMI option slots]]. A VAX-11/750 could have up to three RH750 Adapters; the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7.
+It was implemented on one [[DEC card form factor|extended hex]] card, which mounts in the VAX-11/750 [[backplane]] in one of the three [[VAX-11/750#Backplane_configuration|CMI option slots]]. A VAX-11/750 could have up to three RH750 Adapters; the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7.
-It was common practice to have two separate RH750s, one for [[magnetic tape|tape]] and another for [[disk]] devices. Combining both on one RH750 was possible, but tape usage had a negative impact on disk performance.
+It was common practice to have two separate RH750s, one for [[magnetic tape|tape]], and another for [[disk]] devices. Combining both on one RH750 was possible, but tape usage had a negative impact on disk performance.
 ==See also==
@@ Line 14: / Line 14: @@
 * [http://www.bitsavers.org/pdf/dec/vax/750/MP01045_RH750_Engineering_Drawings_198102.pdf RH750 Field Maintenance Print Set] (MP-01045)
-[[Category: VAX Superminis]]
+[[Category: CMI]]
 [[Category: MASSBUS Controllers]]

@@ Line 14: / Line 14: @@
 * [http://www.bitsavers.org/pdf/dec/vax/750/MP01045_RH750_Engineering_Drawings_198102.pdf RH750 Field Maintenance Print Set] (MP-01045)
-[[Category: VAXen]]
+[[Category: VAX Superminis]]
 [[Category: MASSBUS Controllers]]

@@ Line 1: / Line 1: @@
-The '''RH750 Massbus Adapter''' was a [[MASSBUS]] [[device controller]] for the [[VAX-11/750]]'s [[CPU Memory Interconnect | CPU Memory Interconnect (CMI)]].
+The '''RH750 Massbus Adapter''' was a [[MASSBUS]] [[device controller]] for the [[VAX-11/750]]'s [[CPU/Memory Interconnect]] (CMI).
-It was implemented on one [[DEC card form factor|extended hex]] card, which mounts in the VAX-11/750 [[backplane]] in one of the three CMI option slots.
+It was implemented on one [[DEC card form factor|extended hex]] card, which mounts in the VAX-11/750 [[backplane]] in one of the three [[VAX-11/750#CMI_backplane_configuration|CMI option slots]].
 A VAX-11/750 could have up to three RH750 Adapters, the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7.
-It was common practice to have two separate RH750s, one for tape and another for disk devices.
+It was common practice to have two separate RH750s, one for [[magnetic tape|tape]] and another for [[disk]] devices. Combining both on one RH750 was possible, but tape usage had a negative impact on disk performance.
 == See also ==

@@ Line 38: / Line 38: @@
 # Only one DW750 per system is allowed
 # Only one CI750 per system is allowed
 == External links ==
-* [http://storage.datormuseum.se/u/96935524/Datormusuem/VAX11-750/MP01045_RH750_Feb81.pdf RH750 Field Maintenance Print Set] (MP-01045)
+* [http://www.bitsavers.org/pdf/dec/vax/750/MP01045_RH750_Engineering_Drawings_198102.pdf RH750 Field Maintenance Print Set] (MP-01045)
 [[Category: VAXen]]
 [[Category: MASSBUS Controllers]]