'165, '730 address space

[Ludis Langens]

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/
----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org