| AH |
= |
00h allocate UMB (same as XMS function 10h) (see INT 2F/AX=4310h)
| Call: |
DX |
= |
size in paragraphs |
|
Return: |
BX |
= |
segment number (if successful) |
| DX |
= |
size of requested block/size of largest block |
|
| AH |
= |
01h deallocate UMB (same as XMS func 11h) (see INT 2F/AX=4310h)
| Call: |
DX |
= |
segment number of UMB |
|
| AH |
= |
02h request a bank-switched memory block
| Call: |
DX |
= |
size in paragraphs |
|
Return: |
BX |
= |
segment number (if successful) |
| DX |
= |
size of requested block/size of largest block |
|
| AH |
= |
03h release a bank-switched memory block
| Call: |
DX |
= |
segment number |
|
| AH |
= |
04h transfer data to/from high memory
|
Call: |
DS:SI |
 |
source |
| ES:DI |
|
destination |
| CX |
= |
length in bytes |
| Note: |
Enables bank-switched memory, does the copy,
then disables bank-switched memory. |
|
| AH |
= |
05h get a word from bank-switched memory
| Call: |
ES:DI |
|
word to read |
| Return: |
DX |
= |
word |
|
| AH |
= |
06h put a word to bank-switched memory
| Call: |
ES:DI |
|
word to write |
| Return: |
DX |
= |
word |
|
| AH |
= |
07h put a byte to bank-switched memory
| Call: |
ES:DI |
|
byte to write |
| Return: |
DL |
= |
byte |
|
| AH |
= |
08h enable bank-switched memory
| Call: |
DS:SI |
|
6-byte status save area |
|
| AH |
= |
09h disable bank-switched memory
| Call: |
DS:SI |
|
6-byte save area from enable call (AH=08h) |
|
| AH |
= |
0Ah assign name to UMB or high bank-switched block
|
Call: |
DX |
= |
segment number |
| DS:SI |
|
8-byte blank-padded name |
|
| AH |
= |
0Bh locate UMB block by name
| Call: |
DS:SI |
|
8-byte blank-padded name |
|
Return: |
BX |
= |
segment number (if successful) |
| DX |
= |
size of block |
|
| AH |
= |
0Ch locate bank-switched block by name
| Call: |
DS:SI |
|
8-byte blank-padded name |
|
Return: |
BX |
= |
segment number (if successful) |
| DX |
= |
size of block |
|