FRAM71B
User’s Manual
FRAM71B 1.00
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©Hans Brueggemann, 2016
6 Definition
of
Terms
•
F_Block: A block of 32 kB memory in FRAM, located at a fixed FRAM-address.
•
(Memory-) Chip: A logic entity, configurable to present 16 KB or 32 KB of memory
from a selectable F_Block as either RAM or ROM to the HP-71B.
•
Memory Module: A contiguous set of up to 16 daisy-chained Chips. A Memory Mod-
ule can be addressed by a port number, i.e., PORT(5) .. PORT(5.15).
•
H-address: An address in the address space of the HP-71B, written as H_0xnnnnn.
•
F-address: An address in the address space of the FRAM, written as F_0xnnnnn.
•
C-address: An address in an address space that is common to HP-71B and FRAM,
written as C_0xnnnnn.
•
SYSROM: The 64 KB ROM inside the HP-71B at address H_0x00000-H_0x1FFFF that
holds the operating system.
•
SYSRAM: A 64 KB FRAM area inside FRAM71B at address F_0x00000-F_0x1FFFF, se-
lected and write-protected by jumpers. Can either be used instead of SYSROM to
hold an alternate operating system or as two Chips for Memory Modules.
•
RAM-only Mode: Only RAM, no ROM at address H_0xE0000 configured.
•
Soft Configured (SC) ROM: ROM-Chip(s) that get their memory location configured at
power-on by the HP-71B, rather than having a hard configured (fixed, non-
changeable) address. Example: MATH-ROM
•
Hard-Configured (HC) ROM: ROM-Chip(s) that are always configured to a fixed pre-
programmed memory location. Example: Part of the FORTH-ROM that is always lo-
cated at H_0xE0000.
•
OS: The operating system of your HP-71B.
•
IRAM: "Independent RAM”, RAM portions configured by the [FREE PORT] command.
•
BOT FRAM: 512 KB FRAM, available on all FRAM71B versions.
•
TOP FRAM: An additional 512KB FRAM, only available on an FRAM71B that has the
512 KB FRAM-Extender installed (separately available as upgrade kit).
