There are two methods to determine the revision of the IO boat schizo's:

1) redx

In redx on the SC, execute the following command:

shioc <exp> <slot> <port>

Here is an example looking at expander 2, slot 1, schizo 0:

    redx> shioc 2 1 0 
    PCI IOC IO02/P0   Component ID = 1824C06D    TO_2.2 
           Safari_Control[57:0] = 1555555 05C00007 
               1   SSM_Mode               SafCtl[0] 
               1   HierBusMode            SafCtl[1]             

In this case, the revision is a Schizo 2.2.

You can use this table:

     Version        Component ID 
     --------------------------- 
     1.0            0x1020806D 
     2.0            0x1024C06D 
     2.1            0x1424C06D 
     2.2            0x1824C06D 
     2.3            0x107BE06D 
     2.4            0x207BE06D             

The table comes from the "Schizo Scan Functionality" located on the Schizo Programmers Model page.

2) OBP command show-devs

    {22} ok show-devs 
    /address-extender-queue@3f,0 
    /address-extender-queue@3e,0 
    /pci@3d,600000 
    /pci@3d,700000 
    /pci@3c,600000 
    /pci@3c,700000 
    /memory-controller@23,400000 
    /SUNW,UltraSPARC-III+@23,0 
    /memory-controller@22,400000 
    /SUNW,UltraSPARC-III+@22,0 
    /memory-controller@21,400000 
    /SUNW,UltraSPARC-III+@21,0 
    /memory-controller@20,400000 
    /SUNW,UltraSPARC-III+@20,0 
    /address-extender-queue@1f,0 
    /pci@1d,600000 
    /pci@1d,700000 
    /pci@1c,600000 
    /pci@1c,700000 
    {22} cd /pci@1c,700000 
    {22} ok pwd 
    /pci@1c,700000 
    {22} ok .properties 
    : 
    name                     pci 
    device_type              pci 
    #address-cells           00000003 
    #size-cells              00000002 
    implementation#          00 00 00 2a 
    version#                 00 00 00 04 <===== 04 for Schizo 2.2, 05 for Schizo 2.3 
    portid                   00 00 00 1c             

• Comments: joshua.freeman@central
• HAS Team web page
• Reference FIN I0820-1 for details on schizo 2.3.