41CL User Manual
© 2019, Systemyde International Corporation
27
PLUG1U
PLUG2U
PLUG3U
PLUG4U
PLUGH
(image identifier in ALPHA register)
The
PLUG1U
(
Plug Into Port 1 Upper Half
) function is also identical to the
PLUG1
function except that it only operates on the upper half of Port 1 (Page 9 of the logical
address space). This function can only be used with module images that are one page
long.
The
PLUG2U
(
Plug Into Port 2 Upper Half
) function operates on the upper half of Port
2 (Page B).
The
PLUG3U
(
Plug Into Port 3 Upper Half
) function operates on the upper half of Port
3 (Page D).
The
PLUG4U
(
Plug Into Port 4 Upper Half
) function operates on the upper half of Port
4 (Page F).
The
PLUGH
(
Plug Into HP-IL Page
) function operates on the page normally used for the
HP-IL module (Page 7). Do not plug an HP-IL module into the calculator if you have vir-
tually plugged an image into the page 7.
The various
PLUG
functions can also be used to assign pages in physical memory
directly to the Ports. The upper three nibbles of the physical memory address (so that it
begins on a 4K boundary) are specified, and the
PLUG
function assigns either one page
independent of bank; two pages independent of bank; one page with all four banks; or
two pages, each with all four banks.
ALPHA register
7
6
5
4
3
2
1
image characteristics
format
P5 P4 P3
-
1
6
K
16K (one page, four banks)
format
P5 P4 P3
-
D
B
L
8K (two pages)
format
P5 P4 P3
-
R
A
M
4K (one page)
format
P5 P4 P3
-
M
A
X
32K (two pages, each with four banks)
The
-DBL
,
-RAM
,
-16K
and
-MAX
mnemonics can be used with either RAM or
Flash memory addresses. These mnemonics are decoded independent of the Image
