FRAM71B
User’s Manual
FRAM71B 1.00
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©Hans Brueggemann, 2016
8.4 CN2-2: DIS_OUT_wh_CONFIG
"Disable output while FRAM71B is in CONFIG phase"
Default: not set (jumper removed)
If set, FRAM71B will not report the "3BDDDDDE" IRAM identifiers while being in CONFIG
mode during power-[ON]. Make sure that this jumper is not set unless you want to clear the
contents of all Independent RAM (IRAM). As a result, all IRAM portions previously defined by
[FREE PORT] (5.xx) get reported as normal RAM during CONFIG and are no longer protected
against MEMORY LOST. Note that the HP-71B itself does not necessarily clear those memory
portions automatically when the IRAM identifiers are missing. Therefore, it’s a good idea to
manually force the HP-71B into a MEMORY LOST by [ON]/[/],[3] to make sure that these
memory portions get cleared.
8.5 CN2-1: SLCT_TOP (1 Mbyte-Option, FRAM71B-1024 only)
"Select TOP FRAM"
Default: not set (jumper removed)
FRAM71B-1024 modules are equipped with another 512 KB of FRAM, which is referred to as
"TOP FRAM". On an FRAM71B-1024, this jumper selects F_0x00000 - F_0x2FFFF of TOP
FRAM, if set. If removed, F_0x00000 - F_0x2FFFF of BOT FRAM is selected.
See chapter 12, "FRAM71B-512K-EXT Memory Extension", for further details.
8.6 J1: ENA_SYSRAM
"Enable SYSRAM”
Default: not set (jumper removed)
v
DO NOT SET before disabling the output of the calculator’s SYSROM first.
v
Refer to "Using The SYSRAM Feature”.
If set, FRAM71B will enable the ouput of its SYSRAM area (F_0x00000 – F_0x1FFFF). Use this
feature to switch between different operating systems. SYSRAM is not affected by CN2-3.
