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Motorola Atlas
Board Layout
J1 - Header for Reset and Abort switches J11 - Serial port 2 J2 - IDE/SCSI interface LED J12 - IDE interface J3 - Speaker J14 - PS/2 mouse interface J4 - Chassis fan power J16 - Serial port 1 J5 - SCSI interface J17 - Power LED & keylock J6 - Parallel port J18 - Cache slot J7 - 3.3VDC power in P5-P7 - 32-bit PCI slots 3 through 1 J9 - 3.3VDC power in S1 - Abort switch J10 - Floppy drive interface S2 - Reset switch Note:S1 and S2 may not be present on all models.
CPU Options
The Atlas motherboard directly supports the MPC603, MPC603e, and MPC604 processors at speeds up to 100 MHz or more, where those speeds are supported by both the installed MPC60x processor and the MPC105 memory controller. The restrictions are that the CPU bus speed may not exceed 66 MHz and the PCI bus speed may not exceed 33 MHz.
Memory
The Atlas motherboard uses SIMM (Single In-Line Memory Module) technology for implementing DRAM memory. The motherboard can be populated with either 32-bit or 36-bit (with parity) 72-pin SIMM memory modules. The minimum number of SIMMs required for operation of the Atlas motherboard is two.
Display
If you are using a terminal other than a VGA as your console device, make sure it is configured as follows: 9600 8N1 COM1 serial.