HP FRAM71B User Manual page 14

FRAM71B
The Chip-configuration nibbles (high nibbles in the configuration bytes at H_0x2C000,
H_0x2C002,...) may have the following values:
Size of Chip [KByte]
0 (deactivated)
1)
32
16
32
Table 3: Allowed Chip-Sizes and -Types.
Notes
1. A Chip that is configured to less than 32 KBytes always occupies its entire F_Block, as
shown in Table 1. However, it occupies only as much of your HP-71B's address space
as it is configured to.
2. Chip-addresses as "seen" by your HP-71B will vary according to the calculator's
memory configuration routine. For example, if you configure RAM with Chip_0 =
16 KByte and Chip_1 = 32 KByte, they may have their FRAM base addresses at
F_0x30000 and F_x40000, respectively. However, your HP-71B will configure Chip_0
at H_0x40000 and Chip_1 at H_0x30000.
3. [PEEK$] and [POKE] always work on H-addresses.
4. Chips that are declared as ROM, as well as unused F_Blocks, will not be affected by
"MEMORY LOST" or a power loss condition.
5. Chip_0 is a special-purpose Chip that can be changed to hard-configured (HC-) ROM
by setting a jumper on FRAM71B's component board. When enabled to act as HC-
ROM, Chip_0 appears to your HP-71B as ROM at the fixed address H_0xE0000. Its
contents are not affected by "MEMORY LOST" or a power loss condition.
6. If you plan to use Chips as soft-configured ROMs to hold images of application ROMs,
it is suggested (but not required) to configure them the same way as they are in the
original applications module. Otherwise, the Diagnostic ROM may falsely report
those Chips as "BAD".
FRAM71B 1.00
Config Nibble Last Chip in
Value Module (LCIM)
0
3
OFF
7
OFF
B
ON
F
ON
2
OFF
6
OFF
A
ON
E
ON
1
OFF
5
OFF
9
ON
D
ON
1)
FRAM71B-1024 only.
Device
Type
0 --
RAM
ROM
RAM
ROM
RAM
ROM
RAM
ROM
RAM
ROM
RAM
ROM
- 14 -
User's Manual
FRAM
Size Size
USED
Bit_1 Bit_0
-- -- --
TOP 1 1
TOP 1 1
TOP 1 1
TOP 1 1
BOT 1 0
BOT 1 0
BOT 1 0
BOT 1 0
BOT 0 1
BOT 0 1
BOT 0 1
BOT 0 1
©Hans Brueggemann, 2016