Technical data

1-17
General Information
Model 743 and Model 744 VME Board Computers
Model 743 Memory Controller Circuit
The CPU’s memory controller circuit manages memory. Up to 256 MB of RAM may be
installed. An Error Checking and Correcting (ECC) function checks memory word read/write
operations. The ECC function detects single-bit and double-bit errors. Single-bit errors are
corrected. Double-bit errors are detected but not corrected. The memory controller circuit
uses a 64-bit memory bus. The following two RAM card locations are used:
• RAM stack 1, behind the PS/2 connectors on the system board. Up to three RAM cards are
supported.
Physical RAM slot positions are:
Bottom RAM card, slot 0
Middle RAM card, slot 1
Top RAM card, slot 2
• RAM stack 2, behind the audio connectors on the system board. One RAM card is support-
ed and is in physical RAM slot 3.
Model 744 Memory Controller Circuit
The CPU’s memory controller circuit manages memory. Up to 1 GB of RAM may be
installed. An Error Checking and Correcting (ECC) function checks memory word read/write
operations. The ECC function detects single-bit and double-bit errors. Single-bit errors are
corrected. Double-bit errors are detected but not corrected. The memory controller circuit
uses a 132-bit memory bus. One RAM card location is used, behind the PS/2 connectors on
the system board. Up to four RAM cards are supported.
Physical RAM slot positions are:
Bottom RAM card, slot 0
Second RAM card, slot 1
Third RAM card, slot 2
Fourth RAM card, slot 3
Table 1-10 Model 744 Graphics Performance
On-board
HP Visualize-EG Graphics
132 MHz 165 MHz
X11 Lines 5.74M TBD
Xmark93 33.11 36.47
PLBsurf93 49.7 TBD
PLB wire93 116.1K 135.4K
2D/3D vectors/sec 3.1M TBD