On DOS computers, what would the PARK command do?What is the best choice for DOS for a 1990 80386 PC?What was the block spacing in early hard disks?What we commonly call PCs are in fact ATs, correct?What were the real competitors to the early IBM PC?What were the early PC applications requiring a hard disk?Microsoft Flight Simulator 1.0 “DIVIDE BY ZERO” commandIBM would-be purchase of CP/MWhat does the “x” in “x86” represent?Why do we use caret (^) as the symbol for ctrl/control?What was the first third-party commercial application for MS-DOS?
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On DOS computers, what would the PARK command do?
What is the best choice for DOS for a 1990 80386 PC?What was the block spacing in early hard disks?What we commonly call PCs are in fact ATs, correct?What were the real competitors to the early IBM PC?What were the early PC applications requiring a hard disk?Microsoft Flight Simulator 1.0 “DIVIDE BY ZERO” commandIBM would-be purchase of CP/MWhat does the “x” in “x86” represent?Why do we use caret (^) as the symbol for ctrl/control?What was the first third-party commercial application for MS-DOS?
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In 1994 or so, we had an old computer at my primary school. I remember finding out that it had a park command. From reading its documentation, it said that this command should be executed prior to shutdown. At home I would simply switch off when I saw the DOS prompt and there were no more I/O-indicating lights. I remember thinking at the time that the computer must have been very old if it had to be parked prior to switching it off.
What is this park command? Is it likely that, in 1994, we would have had a school computer that really had to be "parked"? What for?
ibm-pc hard-disk terminology
edited Jul 5 at 16:22
Stephen Kitt
47k8 gold badges195 silver badges198 bronze badges
asked Jul 2 at 12:01
gerritgerrit
3382 silver badges6 bronze badges
add a comment |
In 1994 or so, we had an old computer at my primary school. I remember finding out that it had a park command. From reading its documentation, it said that this command should be executed prior to shutdown. At home I would simply switch off when I saw the DOS prompt and there were no more I/O-indicating lights. I remember thinking at the time that the computer must have been very old if it had to be parked prior to switching it off.
What is this park command? Is it likely that, in 1994, we would have had a school computer that really had to be "parked"? What for?
ibm-pc hard-disk terminology
edited Jul 5 at 16:22
Stephen Kitt
47k8 gold badges195 silver badges198 bronze badges
asked Jul 2 at 12:01
gerritgerrit
3382 silver badges6 bronze badges
What DOS? AppleDOS? AmigaDOS?
– idrougge
2 days ago
@idrougge I have no idea, sorry. I probably didn't know it at the time and I certainly don't know it now.
– gerrit
2 days ago
add a comment |
In 1994 or so, we had an old computer at my primary school. I remember finding out that it had a park command. From reading its documentation, it said that this command should be executed prior to shutdown. At home I would simply switch off when I saw the DOS prompt and there were no more I/O-indicating lights. I remember thinking at the time that the computer must have been very old if it had to be parked prior to switching it off.
What is this park command? Is it likely that, in 1994, we would have had a school computer that really had to be "parked"? What for?
ibm-pc hard-disk terminology
edited Jul 5 at 16:22
Stephen Kitt
47k8 gold badges195 silver badges198 bronze badges
asked Jul 2 at 12:01
gerritgerrit
3382 silver badges6 bronze badges
In 1994 or so, we had an old computer at my primary school. I remember finding out that it had a park command. From reading its documentation, it said that this command should be executed prior to shutdown. At home I would simply switch off when I saw the DOS prompt and there were no more I/O-indicating lights. I remember thinking at the time that the computer must have been very old if it had to be parked prior to switching it off.
What is this park command? Is it likely that, in 1994, we would have had a school computer that really had to be "parked"? What for?
ibm-pc hard-disk terminology
ibm-pc hard-disk terminology
edited Jul 5 at 16:22
Stephen Kitt
47k8 gold badges195 silver badges198 bronze badges
asked Jul 2 at 12:01
gerritgerrit
3382 silver badges6 bronze badges
edited Jul 5 at 16:22
Stephen Kitt
47k8 gold badges195 silver badges198 bronze badges
asked Jul 2 at 12:01
gerritgerrit
3382 silver badges6 bronze badges
edited Jul 5 at 16:22
Stephen Kitt
47k8 gold badges195 silver badges198 bronze badges
edited Jul 5 at 16:22
Stephen Kitt
47k8 gold badges195 silver badges198 bronze badges
edited Jul 5 at 16:22
Stephen Kitt
47k8 gold badges195 silver badges198 bronze badges
47k8 gold badges195 silver badges198 bronze badges
asked Jul 2 at 12:01
gerritgerrit
3382 silver badges6 bronze badges
asked Jul 2 at 12:01
gerritgerrit
3382 silver badges6 bronze badges
asked Jul 2 at 12:01
gerritgerrit
3382 silver badges6 bronze badges
3382 silver badges6 bronze badges
What DOS? AppleDOS? AmigaDOS?
– idrougge
2 days ago
@idrougge I have no idea, sorry. I probably didn't know it at the time and I certainly don't know it now.
– gerrit
2 days ago
add a comment |
What DOS? AppleDOS? AmigaDOS?
– idrougge
2 days ago
@idrougge I have no idea, sorry. I probably didn't know it at the time and I certainly don't know it now.
– gerrit
2 days ago
What DOS? AppleDOS? AmigaDOS?
– idrougge
2 days ago
What DOS? AppleDOS? AmigaDOS?
– idrougge
2 days ago
@idrougge I have no idea, sorry. I probably didn't know it at the time and I certainly don't know it now.
– gerrit
2 days ago
@idrougge I have no idea, sorry. I probably didn't know it at the time and I certainly don't know it now.
– gerrit
2 days ago
add a comment |
2 Answers
2
active
oldest
votes
Hard drives have read/write heads which fly above the spinning disks when the drive is powered. When power is removed, the heads no longer fly... For a long time now, the arms which hold the heads have been designed to “auto-park” the heads away from the disks’ surface, or over a safe “landing zone”, when they lose power¹, but early (up to the mid 80s) hard drives didn’t have this feature, so their heads would land on the disk surface, which could sometimes damage the surface.
So early PCs had a PARK command which would park the heads away from the disk surface. Typically, this would attempt to move the heads past the last cylinder, or, starting with ATs, use the landing zone specified in the BIOS drive parameter table (accessed using the vectors stored at interrupts 0x41 and 0x46). You can see one such implementation in Roedy Green’s PARK which comes with source code.
On PCs with auto-parking heads, it was safe to wait for the DOS command prompt, and the lights to switch off: COMMAND.COM ensures that I/O is finished before it displays the command prompt (and in-memory disk caches are supposed to honour that too).
(In fact, this feature is what allows PARK to work too: you’d wait for the command prompt, so there’s no outstanding I/O, then run PARK, which would be loaded from disk, then run with no I/O apart from parking the heads, then either loop forever or return to the command prompt which would normally not result in any I/O either, so the heads would remain safely parked.)
New PCs in 1994 wouldn’t need this, but it was common for schools to have very old computers, and an early PC requiring PARK wouldn’t be unheard of. Old habits die hard too, so it’s possible that the advice to run PARK was kept alive long after it stopped being relevant, but that would have involved copying the PARK command since it was system-specific and not part of DOS.
If I remember correctly, IDE drives never needed PARK, so you’d only find it on PCs equipped with pre-IDE drives (commonly referred to as MFM or RLL drives).
¹ Or nowadays when they detect a sudden movement.
answered Jul 2 at 12:52
Stephen KittStephen Kitt
47k8 gold badges195 silver badges198 bronze badges
Common for stepper motor drives to need to be parked whereas voice coil drives did not. Also, on some OEM customized versions of DOS that I used the command was "spindown" rather than "park".
– Brian Knoblauch
Jul 2 at 13:11
If I recall correctly, the prompt didn't return after runningPARK. But my memory may be wrong; it's 25+ years ago.
– gerrit
Jul 2 at 13:25
3
I recall park. The lore was "run this before moving the computer". Apparently the disk heads landing wherever was no problem. The disk heads being shaken while moving the computer was. Shrug. Who knows what the lore really should have been.
– Joshua
Jul 2 at 23:32
4
@Joshua The Zenith 8088 I had growing up had a command called "ship", which parked the heads. That confirms the "protect the computer while being moved" idea behind the command.
– Tristan
Jul 3 at 14:20
1
This reminds me of the sync; sync; sync we used to do before shutting down Unix workstations. utcc.utoronto.ca/~cks/space/blog/unix/TheLegendOfSync
– Christian Lescuyer
Jul 3 at 20:45
|
show 7 more comments
This command is supposed to place HDD heads on "park" position.
edited Jul 2 at 12:15
DroidW
3672 silver badges7 bronze badges
answered Jul 2 at 12:06
zizaziza
1193 bronze badges
This answer is correct, but could be better by explaining where the park position is, why its a good idea, and perhaps why we don't need to do this nowdays.
– Criggie
Jul 6 at 4:11
add a comment |
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2 Answers
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2 Answers
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Hard drives have read/write heads which fly above the spinning disks when the drive is powered. When power is removed, the heads no longer fly... For a long time now, the arms which hold the heads have been designed to “auto-park” the heads away from the disks’ surface, or over a safe “landing zone”, when they lose power¹, but early (up to the mid 80s) hard drives didn’t have this feature, so their heads would land on the disk surface, which could sometimes damage the surface.
So early PCs had a PARK command which would park the heads away from the disk surface. Typically, this would attempt to move the heads past the last cylinder, or, starting with ATs, use the landing zone specified in the BIOS drive parameter table (accessed using the vectors stored at interrupts 0x41 and 0x46). You can see one such implementation in Roedy Green’s PARK which comes with source code.
On PCs with auto-parking heads, it was safe to wait for the DOS command prompt, and the lights to switch off: COMMAND.COM ensures that I/O is finished before it displays the command prompt (and in-memory disk caches are supposed to honour that too).
(In fact, this feature is what allows PARK to work too: you’d wait for the command prompt, so there’s no outstanding I/O, then run PARK, which would be loaded from disk, then run with no I/O apart from parking the heads, then either loop forever or return to the command prompt which would normally not result in any I/O either, so the heads would remain safely parked.)
New PCs in 1994 wouldn’t need this, but it was common for schools to have very old computers, and an early PC requiring PARK wouldn’t be unheard of. Old habits die hard too, so it’s possible that the advice to run PARK was kept alive long after it stopped being relevant, but that would have involved copying the PARK command since it was system-specific and not part of DOS.
If I remember correctly, IDE drives never needed PARK, so you’d only find it on PCs equipped with pre-IDE drives (commonly referred to as MFM or RLL drives).
¹ Or nowadays when they detect a sudden movement.
answered Jul 2 at 12:52
Stephen KittStephen Kitt
47k8 gold badges195 silver badges198 bronze badges
Common for stepper motor drives to need to be parked whereas voice coil drives did not. Also, on some OEM customized versions of DOS that I used the command was "spindown" rather than "park".
– Brian Knoblauch
Jul 2 at 13:11
If I recall correctly, the prompt didn't return after runningPARK. But my memory may be wrong; it's 25+ years ago.
– gerrit
Jul 2 at 13:25
3
I recall park. The lore was "run this before moving the computer". Apparently the disk heads landing wherever was no problem. The disk heads being shaken while moving the computer was. Shrug. Who knows what the lore really should have been.
– Joshua
Jul 2 at 23:32
4
@Joshua The Zenith 8088 I had growing up had a command called "ship", which parked the heads. That confirms the "protect the computer while being moved" idea behind the command.
– Tristan
Jul 3 at 14:20
1
This reminds me of the sync; sync; sync we used to do before shutting down Unix workstations. utcc.utoronto.ca/~cks/space/blog/unix/TheLegendOfSync
– Christian Lescuyer
Jul 3 at 20:45
|
show 7 more comments
Hard drives have read/write heads which fly above the spinning disks when the drive is powered. When power is removed, the heads no longer fly... For a long time now, the arms which hold the heads have been designed to “auto-park” the heads away from the disks’ surface, or over a safe “landing zone”, when they lose power¹, but early (up to the mid 80s) hard drives didn’t have this feature, so their heads would land on the disk surface, which could sometimes damage the surface.
So early PCs had a PARK command which would park the heads away from the disk surface. Typically, this would attempt to move the heads past the last cylinder, or, starting with ATs, use the landing zone specified in the BIOS drive parameter table (accessed using the vectors stored at interrupts 0x41 and 0x46). You can see one such implementation in Roedy Green’s PARK which comes with source code.
On PCs with auto-parking heads, it was safe to wait for the DOS command prompt, and the lights to switch off: COMMAND.COM ensures that I/O is finished before it displays the command prompt (and in-memory disk caches are supposed to honour that too).
(In fact, this feature is what allows PARK to work too: you’d wait for the command prompt, so there’s no outstanding I/O, then run PARK, which would be loaded from disk, then run with no I/O apart from parking the heads, then either loop forever or return to the command prompt which would normally not result in any I/O either, so the heads would remain safely parked.)
New PCs in 1994 wouldn’t need this, but it was common for schools to have very old computers, and an early PC requiring PARK wouldn’t be unheard of. Old habits die hard too, so it’s possible that the advice to run PARK was kept alive long after it stopped being relevant, but that would have involved copying the PARK command since it was system-specific and not part of DOS.
If I remember correctly, IDE drives never needed PARK, so you’d only find it on PCs equipped with pre-IDE drives (commonly referred to as MFM or RLL drives).
¹ Or nowadays when they detect a sudden movement.
answered Jul 2 at 12:52
Stephen KittStephen Kitt
47k8 gold badges195 silver badges198 bronze badges
Common for stepper motor drives to need to be parked whereas voice coil drives did not. Also, on some OEM customized versions of DOS that I used the command was "spindown" rather than "park".
– Brian Knoblauch
Jul 2 at 13:11
If I recall correctly, the prompt didn't return after runningPARK. But my memory may be wrong; it's 25+ years ago.
– gerrit
Jul 2 at 13:25
3
I recall park. The lore was "run this before moving the computer". Apparently the disk heads landing wherever was no problem. The disk heads being shaken while moving the computer was. Shrug. Who knows what the lore really should have been.
– Joshua
Jul 2 at 23:32
4
@Joshua The Zenith 8088 I had growing up had a command called "ship", which parked the heads. That confirms the "protect the computer while being moved" idea behind the command.
– Tristan
Jul 3 at 14:20
1
This reminds me of the sync; sync; sync we used to do before shutting down Unix workstations. utcc.utoronto.ca/~cks/space/blog/unix/TheLegendOfSync
– Christian Lescuyer
Jul 3 at 20:45
|
show 7 more comments
Hard drives have read/write heads which fly above the spinning disks when the drive is powered. When power is removed, the heads no longer fly... For a long time now, the arms which hold the heads have been designed to “auto-park” the heads away from the disks’ surface, or over a safe “landing zone”, when they lose power¹, but early (up to the mid 80s) hard drives didn’t have this feature, so their heads would land on the disk surface, which could sometimes damage the surface.
So early PCs had a PARK command which would park the heads away from the disk surface. Typically, this would attempt to move the heads past the last cylinder, or, starting with ATs, use the landing zone specified in the BIOS drive parameter table (accessed using the vectors stored at interrupts 0x41 and 0x46). You can see one such implementation in Roedy Green’s PARK which comes with source code.
On PCs with auto-parking heads, it was safe to wait for the DOS command prompt, and the lights to switch off: COMMAND.COM ensures that I/O is finished before it displays the command prompt (and in-memory disk caches are supposed to honour that too).
(In fact, this feature is what allows PARK to work too: you’d wait for the command prompt, so there’s no outstanding I/O, then run PARK, which would be loaded from disk, then run with no I/O apart from parking the heads, then either loop forever or return to the command prompt which would normally not result in any I/O either, so the heads would remain safely parked.)
New PCs in 1994 wouldn’t need this, but it was common for schools to have very old computers, and an early PC requiring PARK wouldn’t be unheard of. Old habits die hard too, so it’s possible that the advice to run PARK was kept alive long after it stopped being relevant, but that would have involved copying the PARK command since it was system-specific and not part of DOS.
If I remember correctly, IDE drives never needed PARK, so you’d only find it on PCs equipped with pre-IDE drives (commonly referred to as MFM or RLL drives).
¹ Or nowadays when they detect a sudden movement.
answered Jul 2 at 12:52
Stephen KittStephen Kitt
47k8 gold badges195 silver badges198 bronze badges
Hard drives have read/write heads which fly above the spinning disks when the drive is powered. When power is removed, the heads no longer fly... For a long time now, the arms which hold the heads have been designed to “auto-park” the heads away from the disks’ surface, or over a safe “landing zone”, when they lose power¹, but early (up to the mid 80s) hard drives didn’t have this feature, so their heads would land on the disk surface, which could sometimes damage the surface.
So early PCs had a PARK command which would park the heads away from the disk surface. Typically, this would attempt to move the heads past the last cylinder, or, starting with ATs, use the landing zone specified in the BIOS drive parameter table (accessed using the vectors stored at interrupts 0x41 and 0x46). You can see one such implementation in Roedy Green’s PARK which comes with source code.
On PCs with auto-parking heads, it was safe to wait for the DOS command prompt, and the lights to switch off: COMMAND.COM ensures that I/O is finished before it displays the command prompt (and in-memory disk caches are supposed to honour that too).
(In fact, this feature is what allows PARK to work too: you’d wait for the command prompt, so there’s no outstanding I/O, then run PARK, which would be loaded from disk, then run with no I/O apart from parking the heads, then either loop forever or return to the command prompt which would normally not result in any I/O either, so the heads would remain safely parked.)
New PCs in 1994 wouldn’t need this, but it was common for schools to have very old computers, and an early PC requiring PARK wouldn’t be unheard of. Old habits die hard too, so it’s possible that the advice to run PARK was kept alive long after it stopped being relevant, but that would have involved copying the PARK command since it was system-specific and not part of DOS.
If I remember correctly, IDE drives never needed PARK, so you’d only find it on PCs equipped with pre-IDE drives (commonly referred to as MFM or RLL drives).
¹ Or nowadays when they detect a sudden movement.
answered Jul 2 at 12:52
Stephen KittStephen Kitt
47k8 gold badges195 silver badges198 bronze badges
edited Jul 3 at 7:59
answered Jul 2 at 12:52
Stephen KittStephen Kitt
47k8 gold badges195 silver badges198 bronze badges
answered Jul 2 at 12:52
Stephen KittStephen Kitt
47k8 gold badges195 silver badges198 bronze badges
answered Jul 2 at 12:52
Stephen KittStephen Kitt
47k8 gold badges195 silver badges198 bronze badges
47k8 gold badges195 silver badges198 bronze badges
Common for stepper motor drives to need to be parked whereas voice coil drives did not. Also, on some OEM customized versions of DOS that I used the command was "spindown" rather than "park".
– Brian Knoblauch
Jul 2 at 13:11
If I recall correctly, the prompt didn't return after runningPARK. But my memory may be wrong; it's 25+ years ago.
– gerrit
Jul 2 at 13:25
3
I recall park. The lore was "run this before moving the computer". Apparently the disk heads landing wherever was no problem. The disk heads being shaken while moving the computer was. Shrug. Who knows what the lore really should have been.
– Joshua
Jul 2 at 23:32
4
@Joshua The Zenith 8088 I had growing up had a command called "ship", which parked the heads. That confirms the "protect the computer while being moved" idea behind the command.
– Tristan
Jul 3 at 14:20
1
This reminds me of the sync; sync; sync we used to do before shutting down Unix workstations. utcc.utoronto.ca/~cks/space/blog/unix/TheLegendOfSync
– Christian Lescuyer
Jul 3 at 20:45
|
show 7 more comments
Common for stepper motor drives to need to be parked whereas voice coil drives did not. Also, on some OEM customized versions of DOS that I used the command was "spindown" rather than "park".
– Brian Knoblauch
Jul 2 at 13:11
If I recall correctly, the prompt didn't return after runningPARK. But my memory may be wrong; it's 25+ years ago.
– gerrit
Jul 2 at 13:25
3
I recall park. The lore was "run this before moving the computer". Apparently the disk heads landing wherever was no problem. The disk heads being shaken while moving the computer was. Shrug. Who knows what the lore really should have been.
– Joshua
Jul 2 at 23:32
4
@Joshua The Zenith 8088 I had growing up had a command called "ship", which parked the heads. That confirms the "protect the computer while being moved" idea behind the command.
– Tristan
Jul 3 at 14:20
1
This reminds me of the sync; sync; sync we used to do before shutting down Unix workstations. utcc.utoronto.ca/~cks/space/blog/unix/TheLegendOfSync
– Christian Lescuyer
Jul 3 at 20:45
Common for stepper motor drives to need to be parked whereas voice coil drives did not. Also, on some OEM customized versions of DOS that I used the command was "spindown" rather than "park".
– Brian Knoblauch
Jul 2 at 13:11
Common for stepper motor drives to need to be parked whereas voice coil drives did not. Also, on some OEM customized versions of DOS that I used the command was "spindown" rather than "park".
– Brian Knoblauch
Jul 2 at 13:11
If I recall correctly, the prompt didn't return after running
PARK. But my memory may be wrong; it's 25+ years ago.– gerrit
Jul 2 at 13:25
If I recall correctly, the prompt didn't return after running
PARK. But my memory may be wrong; it's 25+ years ago.– gerrit
Jul 2 at 13:25
3
3
I recall park. The lore was "run this before moving the computer". Apparently the disk heads landing wherever was no problem. The disk heads being shaken while moving the computer was. Shrug. Who knows what the lore really should have been.
– Joshua
Jul 2 at 23:32
I recall park. The lore was "run this before moving the computer". Apparently the disk heads landing wherever was no problem. The disk heads being shaken while moving the computer was. Shrug. Who knows what the lore really should have been.
– Joshua
Jul 2 at 23:32
4
4
@Joshua The Zenith 8088 I had growing up had a command called "ship", which parked the heads. That confirms the "protect the computer while being moved" idea behind the command.
– Tristan
Jul 3 at 14:20
@Joshua The Zenith 8088 I had growing up had a command called "ship", which parked the heads. That confirms the "protect the computer while being moved" idea behind the command.
– Tristan
Jul 3 at 14:20
1
1
This reminds me of the sync; sync; sync we used to do before shutting down Unix workstations. utcc.utoronto.ca/~cks/space/blog/unix/TheLegendOfSync
– Christian Lescuyer
Jul 3 at 20:45
This reminds me of the sync; sync; sync we used to do before shutting down Unix workstations. utcc.utoronto.ca/~cks/space/blog/unix/TheLegendOfSync
– Christian Lescuyer
Jul 3 at 20:45
|
show 7 more comments
This command is supposed to place HDD heads on "park" position.
edited Jul 2 at 12:15
DroidW
3672 silver badges7 bronze badges
answered Jul 2 at 12:06
zizaziza
1193 bronze badges
This answer is correct, but could be better by explaining where the park position is, why its a good idea, and perhaps why we don't need to do this nowdays.
– Criggie
Jul 6 at 4:11
add a comment |
This command is supposed to place HDD heads on "park" position.
edited Jul 2 at 12:15
DroidW
3672 silver badges7 bronze badges
answered Jul 2 at 12:06
zizaziza
1193 bronze badges
This answer is correct, but could be better by explaining where the park position is, why its a good idea, and perhaps why we don't need to do this nowdays.
– Criggie
Jul 6 at 4:11
add a comment |
This command is supposed to place HDD heads on "park" position.
edited Jul 2 at 12:15
DroidW
3672 silver badges7 bronze badges
answered Jul 2 at 12:06
zizaziza
1193 bronze badges
This command is supposed to place HDD heads on "park" position.
edited Jul 2 at 12:15
DroidW
3672 silver badges7 bronze badges
answered Jul 2 at 12:06
zizaziza
1193 bronze badges
edited Jul 2 at 12:15
DroidW
3672 silver badges7 bronze badges
edited Jul 2 at 12:15
DroidW
3672 silver badges7 bronze badges
edited Jul 2 at 12:15
DroidW
3672 silver badges7 bronze badges
3672 silver badges7 bronze badges
answered Jul 2 at 12:06
zizaziza
1193 bronze badges
answered Jul 2 at 12:06
zizaziza
1193 bronze badges
answered Jul 2 at 12:06
zizaziza
1193 bronze badges
1193 bronze badges
This answer is correct, but could be better by explaining where the park position is, why its a good idea, and perhaps why we don't need to do this nowdays.
– Criggie
Jul 6 at 4:11
add a comment |
This answer is correct, but could be better by explaining where the park position is, why its a good idea, and perhaps why we don't need to do this nowdays.
– Criggie
Jul 6 at 4:11
This answer is correct, but could be better by explaining where the park position is, why its a good idea, and perhaps why we don't need to do this nowdays.
– Criggie
Jul 6 at 4:11
This answer is correct, but could be better by explaining where the park position is, why its a good idea, and perhaps why we don't need to do this nowdays.
– Criggie
Jul 6 at 4:11
add a comment |
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What DOS? AppleDOS? AmigaDOS?
– idrougge
2 days ago
@idrougge I have no idea, sorry. I probably didn't know it at the time and I certainly don't know it now.
– gerrit
2 days ago