參數資料
型號： E86MON
英文描述： E86MON - E86MON Software User＇s Manual
中文描述： E86MON - E86MON軟件用戶手冊
文件頁數： 64/74頁
文件大?。?/td> 1581K
代理商： E86MON
2.0
E86MON Software User’s Manual
D-1
Appendix D
DOS Emulation Support
This appendix provides a description of the DOS emulation environment supported
by the E86MON software.
The E86MON software supplies a minimal DOS emulation environment for
running converted .EXE files. When an AMD-extended .HEX file is downloaded,
a Program Segment Prefix (PSP) is generated for the file. Most of the PSP’s fields
that are examined by programs are filled in, and the program is relocated into RAM.
One difference from normal DOS environments is that the default near heap is very
small, especially on SD186ER demonstration boards. Use the far heap if this is a
problem (e.g., _fmalloc).
The E86MON software also supports DOS emulation for ROM images. When a
ROM image makes its first int 21h call, the E86MON software enables interrupts
for the serial port and timer (which would not have been enabled if the E86MON
software jumped straight to the application vector at reset). Then, the E86MON
software is ready to provide services.
The following DOS interrupts are supported:
Int 20h
Terminate program execution
Int 21h, service 00h
Terminate program execution
Int 21h, service 01h
Character input with echo
Int 21h, service 02h
Character output
Int 21h, service 03h
Aux input (reads LED code)
Int 21h, service 04h
Aux output (writes LED code)
Int 21h, service 06h
Direct console I/O
Int 21h, service 07h
Raw input
Int 21h, service 08h
Raw input
Int 21h, service 09h
Display string terminated with '$'
Int 21h, service 0Ah
Buffered console input
Int 21h, service 0Bh
Check Keyboard Status
Int 21h, service 0Ch
Flush and execute keyboard function
Int 21h, service 25h
Set interrupt vector
frtbook Page 1 Monday, August 13, 2001 4:07 PM
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