62 lines
2.4 KiB
Plaintext
62 lines
2.4 KiB
Plaintext
AST RESEARCH TECHNICAL BULLETIN TB-0035 7-25-84
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SWITCH SETTINGS FOR THE COMPAQ PORTABLE
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Before one can reconfigure a COMPAQ (without hard disk), one must
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first determine the revision of the ROM BIOS.
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There are a few ways to do this. One way is to look on the
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motherboard at the ROM chip, the revision should be indicated
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there. The revision is also within the ROM chip, located at
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F000:FFE6, in the format 'X COMPAQ', where X is the revision.*
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Another way to determine the revision of the BIOS is from the
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serial number. If the serial number is above 36792, then it is a
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Rev. C, and if it is below, then it is a Rev. B. The COMPAQ Plus
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(with hard disk) is a Rev. C.
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To date, there are two revisions of BIOS in the COMPAQ portables;
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Rev. B, and Rev. C. Revision A was preliminary and never shipped
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installed.
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Configuring a Revision B;
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Consult your AST manual and use the switch settings for a PC-1.
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All portables without hard disks and are a Rev. B, will have
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two switch blocks.
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Switch block 1 is indicated on the motherboard as 'SW1'. It
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is located in the left rear corner on the motherboard,
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partially hidden beneath the cooling fan.
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Switch block 2 is indicated on the motherboard as 'SW2'. It
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is located to the right and forward of switch block one.
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When configuring, be sure to record the original switch
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settings on both blocks, in case there is a problem you
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won't have any trouble reconfiguring the way it was.
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Configuring a Revision C;
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Consult your AST mnnual and use the switch setting for an XT/
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A revsion C may or may not have two switch blocks. If you
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have a hard disk, you probably have only one switch block.
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If in the event you have two, or you have a COMPAQ (without
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the hard disk), you still use the setting for an XT. Switch
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block 1, SW1, is disabled internally and not used. So the
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switch block 2 is to be considered as the only switch block
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on the motherboard.
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Switch block 2, the only switch block you will use, is
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located in the left rear corner of the motherboard.
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* This test can be accessed through BASIC or DEBUG. Consult your
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DOS or BASIC manual on how to do this.
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This information was acquired from a conversation with the
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Technical Support Department of COMPAQ Computer Corporation.
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