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'[Fwd: 8088 SCHEMATIC]'
1999\11\05@082537 by - KITS EDUCACIONAIS NACIONAIS

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       I have some experience with 80188....

       Les, Adam, let study together this circuit...

       The problem is that the schematic is limited for less than 64k

       The A17,A18,A19,A20 are not used...

       When the 8088 is reset, a jump to F:FFF0 (SEG/OFS), forces
a14/a15 to high that enables the EPROM at address C000H. (+offset FF0)=
CFF0H.
       In this address must have a jump for the begin of eprom...maybe
C000:0, am i correct?

       My question is, how can i work with 1M of memory? First, how to
define the structure of assembly program (.COM) to put on EPROM...

       I have an idea, but i want yours comments...

       I'm not sure, but all works at segment 0. (with exception on
RESET)

       Miguel

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Date: Fri, 05 Nov 1999 11:23:15 -0800
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Subject: 8088 SCHEMATIC
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I receive the schematic...

       I have some experience with 80188....

       Les, Adam, let study together this circuit...

       The problem is that the schematic is limited for less than 64k

       The A17,A18,A19,A20 are not used...

       When the 8088 is reset, a jump to F:FFF0 (SEG/OFS), forces
a14/a15 to high that enables the EPROM at address C000H. (+offset FF0)=
CFF0H.
       In this address must have a jump for the begin of eprom...maybe
C000:0, am i correct?

       My question is, how can i work with 1M of memory? First, how to
define the structure of assembly program (.COM) to put on EPROM...

       I have a idea, but i want yours comments...

       I'm not sure, but all works at segment 0. (with exception on
RESET)

       Miguel

1999\11\07@172502 by Dennis Plunkett

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At 11:25 5/11/99 -0800, you wrote:
>I receive the schematic...
>
>        I have some experience with 80188....
>
>        Les, Adam, let study together this circuit...
>
>        The problem is that the schematic is limited for less than 64k
>
>        The A17,A18,A19,A20 are not used...
>
>        When the 8088 is reset, a jump to F:FFF0 (SEG/OFS), forces
>a14/a15 to high that enables the EPROM at address C000H. (+offset FF0)=
>CFF0H.
>        In this address must have a jump for the begin of eprom...maybe
>C000:0, am i correct?

This is the vector location for reset.

>
>        My question is, how can i work with 1M of memory? First, how to
>define the structure of assembly program (.COM) to put on EPROM...
See further. The 1M depends on the type of programme, large data or large
programme? If you move to this size RAM and expect large programmes, then
you should look into a high level language. You will have to find an old
Microsft C or Borland package (Up to 4.2) as they droped support for these


>
>        I have an idea, but i want yours comments...
>
>        I'm not sure, but all works at segment 0. (with exception on
>RESET)
>

No it will not fully address the 1M the CS register will have to be
changed. The 8088 is brain dead and it will only address a single 64K block
at any one time. Some people put the I/O in another 64K block (Out of the
normal in house I/O) and Far pointers are required.

Dennis

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