Content/input from Miod Vallat
Contrary to the other MVME88k boards the 188/188A do not provide any integrated onboard I/O-devices but rather act as containers for the so-called HYPERmodules, which provide the processors and Cache/Memory Management Units (CMMUs), depending on the specific model and configuration. Other components are provided via specific external expansion cards (memory and serial ports) or MVME boards (SCSI, Ethernet, more serial ports, parallel port, FDDI).
| Model | processor(s) | CMMU(s)/L2 cache | Notes |
|---|---|---|---|
| 1P32 | 1 88100 | 2 88200/32KB | |
| 1P64 | 1 88100 | 4 88200/64KB | |
| 1P128 | 1 88100 | 2 88204/128KB | Second most common HYPERmodule. Only to be used in MVME188A. |
| 1P256 | 1 88100 | 4 88204/256KB | Probably never manufactured or sold. Only to be used in MVME188A. |
| 2P64 | 2 88100 | 4 88200/64KB | Third most common HYPERmodule. |
| 2P128 | 2 88100 | 8 88200/128KB | |
| 2P256 | 2 88100 | 4 88204/256KB | Most common HYPERmodule. Only to be used in MVME188A. |
| 2P512 | 2 88100 | 8 88204/512KB | Only to be used in MVME188A. |
| 4P128 | 4 88100 | 8 88200/128KB | |
| 4P512 | 4 88100 | 8 88204/512KB | Only to be used in MVME188A. |
Each 88100 processor has either 2, 4 or 8 88200/4 CMMUs, a configuration with 2 CMMUs per CPU means 1 Instruction CMMU and 1 Data CMMU. If a CPU has 4 CMMUs or more, these can be configured as User/Supervisor mode CMMUs, resulting in Instruction/Data (I/D) Supervisor mode (IS/DS) and I/D User mode (IU/DU) CMMUs.
HYPERmodules with 88204 CMMUs will only work in MVME188A boards.
As said above, the MVME188/188A need special memory boards, namely MVME288, which came in three configurations: 16MB parity, 32MB ECC and 64MB. Up to four memory boards can be used on any MVME188 between thr SYSCON controller and the main logic card.
The following tables list the different available MVME188 and MVME188A versions with their assembly part-number, used HYPERmodule (see above for explanation), clock-frequency of the CPU(s) and installed main-memory. The difference between 188 and 188A are rather small, the 188A has supposedly a slightly cleaned artwork and better reset behaviour which allows SMP operating systems to really reset the hardware (and not hang it).
| model | HYPERmodule | CPU clock | RAM |
|---|---|---|---|
| MVME188SP-1 | 1P128 | 20MHz | 16MB |
| MVME188SP-1-64 | 1P128 | 20MHz | 64MB |
| MVME188SP-2 | 1P128 | 25MHz | 16MB |
| MVME188SP-2-16 | 1P128 | 25MHz | 16MB |
| MVME188SP-2-32 | 1P128 | 25MHz | 2x16MB |
| MVME188SP-2-64 | 1P128 | 25MHz | 64MB |
| MVME188SP-2-128 | 1P128 | 25MHz | 2x64MB |
| MVME188SP-2-256 | 1P128 | 25MHz | 4x64MB |
| MVME188SP-3 | 1P64 | 20MHz | 16MB |
| MVME188SP-5-16 | 1P64 | 25MHz | 16MB |
| MVME188SP-5-32 | 1P64 | 25MHz | 2x16MB |
| MVME188SP-5-64 | 1P64 | 25MHz | 64MB |
| MVME188DP-1 | 2P128 | 20MHz | 16MB |
| MVME188DP-1-64 | 2P128 | 20MHz | 64MB |
| MVME188DP-2 | 2P128 | 25MHz | 16MB |
| MVME188DP-2-16 | 2P128 | 25MHz | 16MB |
| MVME188DP-2-32 | 2P128 | 25MHz | 2x16MB |
| MVME188DP-2-64 | 2P128 | 25MHz | 64MB |
| MVME188DP-2-128 | 2P128 | 25MHz | 2x64MB |
| MVME188DP-2-256 | 2P128 | 25MHz | 4x64MB |
| MVME188DP-3 | 2P64 | 20MHz | 16MB |
| MVME188DP-5-16 | 2P64 | 25MHz | 16MB |
| MVME188DP-5-32 | 2P64 | 25MHz | 32MB ECC |
| MVME188DP-5-64 | 2P64 | 25MHz | 64MB |
| MVME188DP-7-64 | 2P64 | 20MHz | 64MB |
| MVME188QP-1 | 4P128 | 20MHz | 16MB |
| MVME188QP-1-64 | 4P128 | 20MHz | 64MB |
| MVME188QP-2 | 4P128 | 25MHz | 16MB |
| MVME188QP-2-64 | 4P128 | 25MHz | 64MB |
| MVME188QP-2-128 | 4P128 | 25MHz | 2x64MB |
| MVME188QP-2-256 | 4P128 | 25MHz | 4x64 |
| part-number | HYPERmodule | CPU clock | RAM |
|---|---|---|---|
| 9601-1882 | 1P256 | 20MHz | 64MB |
| 9601-1883 | 2P64 | 20MHz | 64MB |
| 9601-1892 | 1P128 | 25MHz | 4x64MB |
| 9601-1893 | 1P128 | 25MHz | 2x64MB |
| 9601-1919 | 1P64 | 20MHz | 16MB |
| 9601-1920 | 1P64 | 25MHz | 16MB |
| 9601-1921 | 2P64 | 25MHz | 2x16MB |
| 9601-1922 | 2P128 | 25MHz | 16MB |
| 9601-1923 | 2P128 | 25MHz | 64MB |
| 9601-1924 | 2P128 | 25MHz | 2x64MB |
| 9601-1925 | 2P64 | 25MHz | 64MB |
