Mounting Boxes
Overview
This page breaks down the available DEC production Q-bus mounting boxes and their typical application. Some of these boxes can house other systems than indicated below. For instance, a PDP-11/73 (KDJ11-A) processor could be installed in a BA11-N box. This made it easy to upgrade older systems.
18-Bit Boxes
The following are a list of mounting boxes used with 16-bit and 18-bit systems, such as the PDP-11/03 and early PDP-11/23 systems. The boxes with blank faceplaces were used as expansion boxes. The BA11-UA was built into furniture or hidden inside a cabinet. The BA11-V and BA11-W were desktop enclosures. The H909-C was provided for user-customized applications.
BA11-M
| BA11-MA | BA11-MB | BA11-MC | BA11-ME | BA11-MF | |
|---|---|---|---|---|---|
| Voltage (AC) | 115 | 230 | N/A | 115 | 230 |
| Front Panel | Full | Full | None | Blank | Blank |
| Backplane | H9270 | H9270 | None | H9270 | H9270 |
| Power Supply | H780-A | H780-B | None | H780-E | H780-F |
| +5V Output | 18 A | 18 A | 18 A | 18 A | |
| +12V Output | 3.5 A | 3.5 A | 3.5 A | 3.5 A | |
| Height (RU) | 2 | 2 | 2 | 2 | 2 |
| Depth (in.) | 13.5 | 13.5 | 13.5 | 13.5 | 13.5 |
BA11-N
| BA11-NC | BA11-ND | BA11-NE | BA11-NF | |
|---|---|---|---|---|
| Voltage (AC) | 115 | 230 | 115 | 230 |
| Front Panel | Full | Full | Blank | Blank |
| Backplane | H9273 | H9273 | H9273 | H9273 |
| Power Supply | H786 | H786 | H786 | H786 |
| +5V Output | 22 A | 22 A | 22 A | 22 A |
| +12V Output | 11 A | 11 A | 11 A | 11 A |
| Height (RU) | 3 | 3 | 3 | 3 |
| Depth (in.) | 22.75 | 22.75 | 22.75 | 22.75 |
Miscellaneous
| BA11-UA | BA11-UB | BA11-VA | BA11-VB | BA11-W | H909-C | |
|---|---|---|---|---|---|---|
| Voltage (AC) | 115 | 230 | 120 | 240 | 120/240 | N/A |
| Front Panel | None | None | Blank | Blank | Full | Custom |
| Backplane | 3xH9270 | 3xH9270 | H9281-BA | H9281-BA | H9270 | DDV11-B |
| Power Supply | H780-A + 2xH780-E |
H780-B + 2xH780-F |
H7833-A | H7833-B | Unknown | None |
| +5V Output | 54 A | 54 A | 5.6 A | 5.6 A | Unknown | |
| +12V Output | 10.5 A | 10.5 A | 1.6 A | 1.6 A | Unknown | |
| Height (RU) | 9 | 9 | Desktop | Desktop | Desktop | 3 |
| Depth (in.) | 13.5 | 13.5 | 11.7 | 11.7 | 24.75 |
22-Bit Boxes
The following is a list of mounting boxes used with 22-bit systems, such as the PDP-11/23+. The boxes with blank faceplaces were used as expansion boxes.
| BA11-SA | BA11-SB | BA11-SC | BA11-SD | |
|---|---|---|---|---|
| Voltage | 120 | 240 | 120 | 240 |
| Front Panel | Full | Full | Blank | Blank |
| Backplane | H9276 | H9276 | H9276 | H9276 |
| Power Supply | H7861 | H7861 | H7861 | H7861 |
| +5V Output | 36 A | 36 A | 36 A | 36 A |
| +12V Output | 5 A | 5 A | 5 A | 5 A |
| Height (RU) | 3 | 3 | 3 | 3 |
| Depth (in.) | 22.75 | 22.75 | 22.75 | 22.75 |
MicroPDP Boxes
The following is a list of mounting boxes normally used with MicroPDP-11/23, 53, 73, 83 and 93 systems.
| BA23-A | BA123 | BA213 | |
|---|---|---|---|
| Voltage | 120/240 | 120/240 | 120/240 |
| Front Panel | Full | Full | Full |
| Backplane | H9278-A | 50-17506-01 | 70-23712-01 |
| Slots | 8 | 12 | 12 |
| Power Supply (W) | 230 | 460 | 2x230 |
| Height (Tower) | 22.13 | 24.5 | 27 |
| Width (Tower) | 7 | 13 | 21 |
| Depth (in.) | 28.6 | 27.5 | 17.8 |
References
- LSI-11 Systems Service Manual, 5th Edition, January 1985 (EK-LSIFS-SV-005)
- PDP-11/23B Mounting Box User's Guide, 1st Edition, January 1982 (EK-23BMB-UG-001)
- Micro/PDP-11 System Technical Manual, 2nd Edition, January 1984 (EK-0LCP5-TM-002)
- BA23 Enclosure Maintenance, 1st Edition, 1988 (EK-186AA-MG-001)
- BA123 Enclosure Maintenance, 1st Edition, 1988 (EK-188AA-MG-001)
- BA213 Enclosure Maintenance, 1st Edition, 1988 (EK-189AA-MG-001)
- Digital Microcomputer Interfaces Handbook 1983-84 (EB-23144-18)
Additional Resources
- MicroNote 29 - Q-bus Expansion Concepts
- MicroNote 35 - Backplane Expansion/Termination
