Difference between revisions of "VAX-11/750"
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| − | The '''VAX-11/750''' (also known as the VAX/750) is a slower, more compact, but less expensive version of the [[VAX-11/780]]. It was built around the [[CPU Memory Interconnect]]; major | + | The '''VAX-11/750''' (also known as the VAX/750) is a slower, more compact, but less expensive version of the [[VAX-11/780]]. It was built around the [[CPU/Memory Interconnect]] [[bus]] (CMI); the mandatory major CMI sub-systems (and components thereof) were: |
* [[KA750 CPU]] | * [[KA750 CPU]] | ||
| Line 15: | Line 15: | ||
** [[FP750 Floating-Point Accelerator]] (optional) | ** [[FP750 Floating-Point Accelerator]] (optional) | ||
* [[MS750 Memory System]] | * [[MS750 Memory System]] | ||
| + | |||
| + | It was codenamed 'Comet' by DEC. One of the first OS's available for the 750 was [[4.1 BSD]]. According to 'Quarter Century of UNIX', the DoD could purchase 6 750's for about $150,000 USD. | ||
| + | |||
| + | == CMI Options == | ||
| + | |||
| + | The CMI was instantiated as a large [[backplane]]; option slots in the backplane can be used for a variety of optional adapters: | ||
| + | |||
* [[RH750 Massbus Adapter]] | * [[RH750 Massbus Adapter]] | ||
| − | * [[CI750 Computer Interconnect Interface]] | + | * [[CI750 Computer Interconnect Interface]] (CI) |
| + | * [[DW750 Second Unibus Interface]] | ||
| + | * [[DR750 Parallel Interface]] | ||
| − | + | Allowable Configurations of CMI Slots 7, 8, & 9 are: | |
| + | |||
| + | {| 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 | ||
| − | == | + | ==VAX-11/750 Pictures== |
| − | [[File:VAX-11750_Cardcage.JPG|400px|thumb| | + | [[File:VAX-11750_Cardcage.JPG|400px|thumb|left|View into a VAX-11/750 card cage]] |
Left of card cage: | Left of card cage: | ||
* Top: 54-13489 - [[TU58]] controller | * Top: 54-13489 - [[TU58]] controller | ||
| − | * Bottom: H7112 - | + | * Bottom: H7112 - VAX-11/780 / VAX-11/750 Battery Backup Unit |
Inside card cage: | Inside card cage: | ||
| − | * Left: [[DD11|DD11-DK | + | * Left: [[DD11-D backplane|DD11-DK Unibus Backplane]] (with cards) |
* Center: Memory Backplane (with cards) | * Center: Memory Backplane (with cards) | ||
| − | * Right: [[CMI]] Backplane (with cards) | + | * Right: [[CPU/Memory Interconnect|CMI]] Backplane (with cards) |
| + | |||
| + | <br clear=all> | ||
| + | [[File:VAX-11750_Backplane.JPG|400px|thumb|left|View of VAX-11/750 backplanes from behind]] | ||
| − | |||
Backplanes: | Backplanes: | ||
* Left: CMI Backplane | * Left: CMI Backplane | ||
| Line 39: | Line 72: | ||
Lower left corner: 5V and 2.5V Power Supply cables (as thick as a finger!) | Lower left corner: 5V and 2.5V Power Supply cables (as thick as a finger!) | ||
| − | |||
Bottom: 5V and 2.5V Power Supplies | Bottom: 5V and 2.5V Power Supplies | ||
| − | [[File:VAX-11750_PSUs.JPG| | + | <br clear=all> |
| + | [[File:VAX-11750_PSUs.JPG|00px|thumb|left|VAX-11/750 Power Supply Units]] | ||
* Left: H7104-C 2.5V, 85A | * Left: H7104-C 2.5V, 85A | ||
* Right: H7104-D 5V, 135A | * Right: H7104-D 5V, 135A | ||
| + | <br clear=all> | ||
{{semi-stub}} | {{semi-stub}} | ||
Revision as of 03:24, 2 June 2022
| VAX-11/750 | |
 VAX-11/750 | |
| Codename: | Comet |
|---|---|
| Year Introduced: | October 1980 |
| RAM: | Max of 14 MB |
| VUPS: | 0.65 |
The VAX-11/750 (also known as the VAX/750) is a slower, more compact, but less expensive version of the VAX-11/780. It was built around the CPU/Memory Interconnect bus (CMI); the mandatory major CMI sub-systems (and components thereof) were:
It was codenamed 'Comet' by DEC. One of the first OS's available for the 750 was 4.1 BSD. According to 'Quarter Century of UNIX', the DoD could purchase 6 750's for about $150,000 USD.
CMI Options
The CMI was instantiated as a large backplane; option slots in the backplane can be used for a variety of optional adapters:
- RH750 Massbus Adapter
- CI750 Computer Interconnect Interface (CI)
- DW750 Second Unibus Interface
- DR750 Parallel Interface
Allowable Configurations of CMI Slots 7, 8, & 9 are:
| 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
VAX-11/750 Pictures
Left of card cage:
- Top: 54-13489 - TU58 controller
- Bottom: H7112 - VAX-11/780 / VAX-11/750 Battery Backup Unit
Inside card cage:
- Left: DD11-DK Unibus Backplane (with cards)
- Center: Memory Backplane (with cards)
- Right: CMI Backplane (with cards)
Backplanes:
- Left: CMI Backplane
- Center: Memory Backplane
- Right: DD11-DK - Unibus Backplane
Lower left corner: 5V and 2.5V Power Supply cables (as thick as a finger!) Bottom: 5V and 2.5V Power Supplies
- Left: H7104-C 2.5V, 85A
- Right: H7104-D 5V, 135A
See also
External links
- VAX Hardware Handbook Volume 1 - the VAX-11/750 is covered in Chapter 4 (pp. 154-171 of the PDF)
- VAX Maintenance Handbook: VAX-11/750 (EK-VAXV3-HB-001)
- VAX/750 - documentation at Bitsavers
- 11/750 Field Maintenance Print Set (MP01377)
- Vax 11/750 Frequently Asked Questions
- VAX-11/750
- Makings of a Comet: The VAX 11/750
| v • d • e VAX Computers and Operating Systems |
|---|
| VAX-11/7xx (including VAX 86x0) - VAX-11/780 • VAX-11/785 • VAX-11/750 • VAX-11/730 • VAX 8600 • VAX 8650
VAX 8000 series (excluding VAX 86x0) - VAX 82xx/83xx series • VAX 85x0/8700/88xx series MicroVAXen (many types also come in VAXserver and VAXstation models) - MicroVAX I • MicroVAX II VAXstation Series - VAXstation I • VAXstation II Late Model VAXen - VAX 4000 series • VAX 6000 series • VAX 7000 series • VAX 9000 series • VAX 10000 series |
| Special Purpose VAXen - VAXft series • rtVAX series • Infoserver series
Clones - CM 1700 • TPA-11/580 |
