'165, '730 address space

[Dave Zug]

Thanks Ludis - I had sucessfully used the ample eprom space on the P4 (727)
for little patches, stupid of me to completely forget the '730  / '727
relationship. (DOH!).

the '165 was the REAL info I was wondering about. maybe some dead code to
wipe out, maybe a modern compiler can optimize the assembly and reduce the
space needed? I just wonder...


----- Original Message -----
From: Ludis Langens <ludis at cruzers.com>
To: <gmecm at diy-efi.org>
Sent: Friday, September 29, 2000 8:53 PM
Subject: Re: '165, '730 address space


> Dave Zug wrote:
> >
> > Does anyone know if the 1k (or more) memory block immediately following
the
> > 16k PROM ('165) / 32k PROM ('730 specifically) is "available" or is
> > mapped/wired to other IC's ?
>
> Here are the used memory ranges of various P4 ECMs:
>
> $0000-$01FF  On chip SRAM
> $0200-$03FF  On chip SRAM of enhanced P4 MPU's
> $1800-$1FFF  Added SRAM in 16149396 (or user upgraded 1227730/etc)
> $3DC0-$3DFF  Extra timer chip
> $3F80-$3FBF  Extra timer chip
> $3FC0-$3FFF  P4 timer chip
> $4000-$400F  P4 MPU I/O registers
> $6000-$6FFF  Any access will reset a P4 MPU
> $8000-$FFFF  EPROM (MEMCAL or MEMPAK)
>
> If you are using a 27128 EPROM, the memory range from $8000 to $BFFF
> might contain a second copy of the EPROM image depending on the
> particular ECM and EPROM chip.
>
>
> My debugger board successfully uses $4800-$5FFF for it's hardware.
>
> --
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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