參數(shù)資料
型號(hào)： 21891_1
英文描述： E86MON? Software User＇s Manual E86MON Software User＇s Manual Amendmentl
中文描述： E86MON？軟件用戶手冊(cè)E86MON軟件用戶手冊(cè)Amendmentl
文件頁(yè)數(shù)： 67/74頁(yè)
文件大?。?/td> 1581K
代理商： 21891_1
2
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
Int 21h, service 00h
Int 21h, service 01h
Int 21h, service 02h
Int 21h, service 03h
Int 21h, service 04h
Int 21h, service 06h
Int 21h, service 07h
Int 21h, service 08h
Int 21h, service 09h
Int 21h, service 0Ah
Int 21h, service 0Bh
Int 21h, service 0Ch
Int 21h, service 25h
Terminate program execution
Terminate program execution
Character input with echo
Character output
Aux input (reads LED code)
Aux output (writes LED code)
Direct console I/O
Raw input
Raw input
Display string terminated with '$'
Buffered console input
Check Keyboard Status
Flush and execute keyboard function
Set interrupt vector
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