ScutBoy
Experienced Member
I have in hand a Sperry labled Corona PPC-400
It has a WDC hard drive controller in it, and a DTK(?) 1.2M floppy drive controller as the only cards.
The machine has 512K of RAM in it, based on physical observation of the MB
The hard drive doesn't work.
When it boots up, there's a banner for the 1.2M card.
It will then say there's 472K of memory available. Not in front of it, but that number may change slightly from boot to boot.
I have a floppy with DOS 3.3 on it.
The machine will say it's loading MS-DOS, and then come up with
Bad or missing COMMAND.COM file and then ask for the path to COMMAND.COM
It then gives an "A>" prompt.
To me, A> is a CP/M prompt not the "A:" prompt I would expect from DOS. This floppy will boot my Compaq Portable III with no issue.
If I plug the existing drive into the motherboard floppy connector, the drive doesn't work at all.
Removing the HD controller doesn't make a difference in behavior.
Jumpers on the MB all seem correct for the config of the machine.
So my questions are:
Does the A> prompt make sense? Everything I read says this is a DOS machine, not a CP/M machine - or is this a red herring?
Might I have bad RAM, since it's only reporting 472K and not the whole 512K? Perhaps the add-on disk controller is using some?
What else should I check for?
It has a WDC hard drive controller in it, and a DTK(?) 1.2M floppy drive controller as the only cards.
The machine has 512K of RAM in it, based on physical observation of the MB
The hard drive doesn't work.
When it boots up, there's a banner for the 1.2M card.
It will then say there's 472K of memory available. Not in front of it, but that number may change slightly from boot to boot.
I have a floppy with DOS 3.3 on it.
The machine will say it's loading MS-DOS, and then come up with
Bad or missing COMMAND.COM file and then ask for the path to COMMAND.COM
It then gives an "A>" prompt.
To me, A> is a CP/M prompt not the "A:" prompt I would expect from DOS. This floppy will boot my Compaq Portable III with no issue.
If I plug the existing drive into the motherboard floppy connector, the drive doesn't work at all.
Removing the HD controller doesn't make a difference in behavior.
Jumpers on the MB all seem correct for the config of the machine.
So my questions are:
Does the A> prompt make sense? Everything I read says this is a DOS machine, not a CP/M machine - or is this a red herring?
Might I have bad RAM, since it's only reporting 472K and not the whole 512K? Perhaps the add-on disk controller is using some?
What else should I check for?