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Is there an accurate (speedwise) 8086 emulator?
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I'm trying to emulate programs from the 80s, but with an accurate clock-speed¹ (pretending its an 8086). Meaning that if a 8086 would take X ms/opcode, the emulator should take X ms (+- a bit of jitter as I'm not running a RTOS). If it should take Y ms to access RAM, the emulator should take Y ms to access RAM.
Is there such an emulator (preferably running on Linux or web)?
¹ Which is why I can't use something like qemu.
emulation 8086
edited 8 mins ago
Stephen Kitt
31k4126148
asked 3 hours ago
multics
16615
add a comment |Â
up vote
2
down vote
favorite
I'm trying to emulate programs from the 80s, but with an accurate clock-speed¹ (pretending its an 8086). Meaning that if a 8086 would take X ms/opcode, the emulator should take X ms (+- a bit of jitter as I'm not running a RTOS). If it should take Y ms to access RAM, the emulator should take Y ms to access RAM.
Is there such an emulator (preferably running on Linux or web)?
¹ Which is why I can't use something like qemu.
emulation 8086
edited 8 mins ago
Stephen Kitt
31k4126148
asked 3 hours ago
multics
16615
Looks like you are aiming for Machine Cycle level emulation which is pretty rare. The majority of emulators use just Clock Tics (time bursting) which is allowing just specific CPU CLK clock cycles be elapsed in some time interval (like timer) to throttle the speed to relevant emulated clock. Yes in such case the emulation speed seems correct but HW access is far from it. Look here Question about cycle counting accuracy when emulating a CPU sadly I do not know of any MC level emulation of x86 out there but I did not look for it either...
– Spektre
11 mins ago
add a comment |Â
up vote
2
down vote
favorite
up vote
2
down vote
favorite
I'm trying to emulate programs from the 80s, but with an accurate clock-speed¹ (pretending its an 8086). Meaning that if a 8086 would take X ms/opcode, the emulator should take X ms (+- a bit of jitter as I'm not running a RTOS). If it should take Y ms to access RAM, the emulator should take Y ms to access RAM.
Is there such an emulator (preferably running on Linux or web)?
¹ Which is why I can't use something like qemu.
emulation 8086
edited 8 mins ago
Stephen Kitt
31k4126148
asked 3 hours ago
multics
16615
I'm trying to emulate programs from the 80s, but with an accurate clock-speed¹ (pretending its an 8086). Meaning that if a 8086 would take X ms/opcode, the emulator should take X ms (+- a bit of jitter as I'm not running a RTOS). If it should take Y ms to access RAM, the emulator should take Y ms to access RAM.
Is there such an emulator (preferably running on Linux or web)?
¹ Which is why I can't use something like qemu.
emulation 8086
emulation 8086
edited 8 mins ago
Stephen Kitt
31k4126148
asked 3 hours ago
multics
16615
edited 8 mins ago
Stephen Kitt
31k4126148
asked 3 hours ago
multics
16615
edited 8 mins ago
Stephen Kitt
31k4126148
edited 8 mins ago
Stephen Kitt
31k4126148
edited 8 mins ago
Stephen Kitt
31k4126148
31k4126148
asked 3 hours ago
multics
16615
asked 3 hours ago
multics
16615
asked 3 hours ago
multics
16615
16615
Looks like you are aiming for Machine Cycle level emulation which is pretty rare. The majority of emulators use just Clock Tics (time bursting) which is allowing just specific CPU CLK clock cycles be elapsed in some time interval (like timer) to throttle the speed to relevant emulated clock. Yes in such case the emulation speed seems correct but HW access is far from it. Look here Question about cycle counting accuracy when emulating a CPU sadly I do not know of any MC level emulation of x86 out there but I did not look for it either...
– Spektre
11 mins ago
add a comment |Â
Looks like you are aiming for Machine Cycle level emulation which is pretty rare. The majority of emulators use just Clock Tics (time bursting) which is allowing just specific CPU CLK clock cycles be elapsed in some time interval (like timer) to throttle the speed to relevant emulated clock. Yes in such case the emulation speed seems correct but HW access is far from it. Look here Question about cycle counting accuracy when emulating a CPU sadly I do not know of any MC level emulation of x86 out there but I did not look for it either...
– Spektre
11 mins ago
Looks like you are aiming for Machine Cycle level emulation which is pretty rare. The majority of emulators use just Clock Tics (time bursting) which is allowing just specific CPU CLK clock cycles be elapsed in some time interval (like timer) to throttle the speed to relevant emulated clock. Yes in such case the emulation speed seems correct but HW access is far from it. Look here Question about cycle counting accuracy when emulating a CPU sadly I do not know of any MC level emulation of x86 out there but I did not look for it either...
– Spektre
11 mins ago
Looks like you are aiming for Machine Cycle level emulation which is pretty rare. The majority of emulators use just Clock Tics (time bursting) which is allowing just specific CPU CLK clock cycles be elapsed in some time interval (like timer) to throttle the speed to relevant emulated clock. Yes in such case the emulation speed seems correct but HW access is far from it. Look here Question about cycle counting accuracy when emulating a CPU sadly I do not know of any MC level emulation of x86 out there but I did not look for it either...
– Spektre
11 mins ago
add a comment |Â
2 Answers
2
active
oldest
votes
up vote
3
down vote
PCem aims to be an accurate emulator, and its 8086/8088 timings are accurate. It can emulate a wide variety of hardware, and can model specific PCs with their ROMs (such as the original IBM PC, the Amstrad 1640, and many others). It is available for Linux and Windows.
Its 8086 emulation is implemented in src/808x.c — you can see there that it keeps track of the cycles taken by each instruction, and each memory access, and takes into account memory prefetches and the cycles lost to memory refresh. It even emulates CGA snow!
answered 2 hours ago
Stephen Kitt
31k4126148
add a comment |Â
up vote
1
down vote
A bit hard to answer with the little information you give. Since you especially mention the8086 (not 8088), it may be safe you're not about to emulate an IBM PC.
The i8086emu might be right for you. It emulates a rather straight foreward 8086 singleboard computer with the somewhat generic name SBC8086 :)) That machine runs on 5 MHz, and the emulator is suppoesed to be close. It's made to run under Linux, using GTK2 as frontend, but also compiles for 32 bit Windows.
The emulator got a quite remarkable software structure with interfaces for easy integration of 'new' simulated chips and I/O hardware.
There might be a little hurdle, as most documentation is in German :))
answered 3 hours ago
Raffzahn
36.4k480144
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
PCem aims to be an accurate emulator, and its 8086/8088 timings are accurate. It can emulate a wide variety of hardware, and can model specific PCs with their ROMs (such as the original IBM PC, the Amstrad 1640, and many others). It is available for Linux and Windows.
Its 8086 emulation is implemented in src/808x.c — you can see there that it keeps track of the cycles taken by each instruction, and each memory access, and takes into account memory prefetches and the cycles lost to memory refresh. It even emulates CGA snow!
answered 2 hours ago
Stephen Kitt
31k4126148
add a comment |Â
up vote
3
down vote
PCem aims to be an accurate emulator, and its 8086/8088 timings are accurate. It can emulate a wide variety of hardware, and can model specific PCs with their ROMs (such as the original IBM PC, the Amstrad 1640, and many others). It is available for Linux and Windows.
Its 8086 emulation is implemented in src/808x.c — you can see there that it keeps track of the cycles taken by each instruction, and each memory access, and takes into account memory prefetches and the cycles lost to memory refresh. It even emulates CGA snow!
answered 2 hours ago
Stephen Kitt
31k4126148
add a comment |Â
up vote
3
down vote
up vote
3
down vote
PCem aims to be an accurate emulator, and its 8086/8088 timings are accurate. It can emulate a wide variety of hardware, and can model specific PCs with their ROMs (such as the original IBM PC, the Amstrad 1640, and many others). It is available for Linux and Windows.
Its 8086 emulation is implemented in src/808x.c — you can see there that it keeps track of the cycles taken by each instruction, and each memory access, and takes into account memory prefetches and the cycles lost to memory refresh. It even emulates CGA snow!
answered 2 hours ago
Stephen Kitt
31k4126148
PCem aims to be an accurate emulator, and its 8086/8088 timings are accurate. It can emulate a wide variety of hardware, and can model specific PCs with their ROMs (such as the original IBM PC, the Amstrad 1640, and many others). It is available for Linux and Windows.
Its 8086 emulation is implemented in src/808x.c — you can see there that it keeps track of the cycles taken by each instruction, and each memory access, and takes into account memory prefetches and the cycles lost to memory refresh. It even emulates CGA snow!
answered 2 hours ago
Stephen Kitt
31k4126148
edited 38 mins ago
answered 2 hours ago
Stephen Kitt
31k4126148
answered 2 hours ago
Stephen Kitt
31k4126148
answered 2 hours ago
Stephen Kitt
31k4126148
31k4126148
add a comment |Â
add a comment |Â
up vote
1
down vote
A bit hard to answer with the little information you give. Since you especially mention the8086 (not 8088), it may be safe you're not about to emulate an IBM PC.
The i8086emu might be right for you. It emulates a rather straight foreward 8086 singleboard computer with the somewhat generic name SBC8086 :)) That machine runs on 5 MHz, and the emulator is suppoesed to be close. It's made to run under Linux, using GTK2 as frontend, but also compiles for 32 bit Windows.
The emulator got a quite remarkable software structure with interfaces for easy integration of 'new' simulated chips and I/O hardware.
There might be a little hurdle, as most documentation is in German :))
answered 3 hours ago
Raffzahn
36.4k480144
add a comment |Â
up vote
1
down vote
A bit hard to answer with the little information you give. Since you especially mention the8086 (not 8088), it may be safe you're not about to emulate an IBM PC.
The i8086emu might be right for you. It emulates a rather straight foreward 8086 singleboard computer with the somewhat generic name SBC8086 :)) That machine runs on 5 MHz, and the emulator is suppoesed to be close. It's made to run under Linux, using GTK2 as frontend, but also compiles for 32 bit Windows.
The emulator got a quite remarkable software structure with interfaces for easy integration of 'new' simulated chips and I/O hardware.
There might be a little hurdle, as most documentation is in German :))
answered 3 hours ago
Raffzahn
36.4k480144
add a comment |Â
up vote
1
down vote
up vote
1
down vote
A bit hard to answer with the little information you give. Since you especially mention the8086 (not 8088), it may be safe you're not about to emulate an IBM PC.
The i8086emu might be right for you. It emulates a rather straight foreward 8086 singleboard computer with the somewhat generic name SBC8086 :)) That machine runs on 5 MHz, and the emulator is suppoesed to be close. It's made to run under Linux, using GTK2 as frontend, but also compiles for 32 bit Windows.
The emulator got a quite remarkable software structure with interfaces for easy integration of 'new' simulated chips and I/O hardware.
There might be a little hurdle, as most documentation is in German :))
answered 3 hours ago
Raffzahn
36.4k480144
A bit hard to answer with the little information you give. Since you especially mention the8086 (not 8088), it may be safe you're not about to emulate an IBM PC.
The i8086emu might be right for you. It emulates a rather straight foreward 8086 singleboard computer with the somewhat generic name SBC8086 :)) That machine runs on 5 MHz, and the emulator is suppoesed to be close. It's made to run under Linux, using GTK2 as frontend, but also compiles for 32 bit Windows.
The emulator got a quite remarkable software structure with interfaces for easy integration of 'new' simulated chips and I/O hardware.
There might be a little hurdle, as most documentation is in German :))
answered 3 hours ago
Raffzahn
36.4k480144
answered 3 hours ago
Raffzahn
36.4k480144
answered 3 hours ago
Raffzahn
36.4k480144
answered 3 hours ago
Raffzahn
36.4k480144
36.4k480144
add a comment |Â
add a comment |Â
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Looks like you are aiming for Machine Cycle level emulation which is pretty rare. The majority of emulators use just Clock Tics (time bursting) which is allowing just specific CPU CLK clock cycles be elapsed in some time interval (like timer) to throttle the speed to relevant emulated clock. Yes in such case the emulation speed seems correct but HW access is far from it. Look here Question about cycle counting accuracy when emulating a CPU sadly I do not know of any MC level emulation of x86 out there but I did not look for it either...
– Spektre
11 mins ago