[Coco] Drivewire client for OS9/68K

[Joel Ewy]

On 08/29/2010 09:29 PM, Bob Devries wrote:

> Hi Joel,

>

> I'd guess that a DW client for OS9/68K would involve merging parts of 

> the serial driver such as SC68681 and a hard disk driver (I have 

> source for 2 of those, and the sc68681), and then add the special 

> commands for DW.


Is that the way it's done on the CoCo?  What part of the disk driver 
would need to be in there?  I need to look at the source.

Also, regarding hardware flow control on the 68681 ports -- DW on the 
CoCo is done on the bitbanger port, so no hardware flow control there.  
I'm guessing that interrupts are masked quite a bit of the time.  Maybe 
the MM/1 could bit-bang with one of the parallel port lines -- it might 
even be faster than the UARTs...


>

> BTW, I need to hack the clock chip on my IO board; the battery in the 

> clock module is now dead. I have seen some info on how to connect an 

> external battery to one of these. I don't have a lot to lose if I try it.

>


I've got a rail or two of those Dallas clock chips, unused.  But the 
batteries in them are just as old as yours.  ISTR that those Dallas 
chips use a compatible pinout to that Motorola RTC that doesn't have a 
battery.  I wonder if you could pull the clock out of an old '286 or 
'386 PC motherboard, bend a couple pins out, and strap a battery on the 
back of it...

JCE


> ----- Original Message ----- From: "Joel Ewy" <jcewy at swbell.net>

> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>

> Sent: Saturday, August 28, 2010 12:22 PM

> Subject: Re: [Coco] Drivewire client for OS9/68K

>

>

>> On 08/27/2010 07:56 PM, Bob Devries wrote:

>>> Hi all,

>>>

>>> what are the chances of a drivewire client being built for 

>>> OS9/68000? The (extended) MM/1 is well endowed with serial ports via 

>>> the 68070, 68901 and 68681 chips. I'm sure they'd be capable of the 

>>> speek necessary.

>>>

>>

>> Bob, you and I may be the only two people on this list who still have 

>> working MM/1 systems (though I'd love to be proven wrong) and I need 

>> to put a 'new' hard drive in mine.  Fortunately I have a small supply 

>> of SCSI drives from old Macs.  I really need to figure out how to use 

>> a SCSI ZIP drive on the MM/1 though, so I have some reasonable way to 

>> back it up... But Drivewire would really help that situation as 

>> well.  I would love to have a DW client for the MM/1.

>>

>>> I notics that it is no longer possible to browse the source tree of 

>>> NitrOS9; else I'd have a go myself at trying to build a 68K version.

>>>

>>

>> Time permitting, I'd be willing to help in the porting effort.  My 

>> experience in 68000 assembler is limited to a few exercises in a 

>> class about 20 years ago, and my C is only marginally better by most 

>> reasonable standards, but there's some motivation to learn.

>>

>> JCE

>>

>>> Regards, Bob Devries

>>> Dalby, QLD, Australia

>>>

>>> -- 

>>> Besides a mathematical inclination, an exceptionally good mastery of 

>>> one's native tongue is the most vital asset of a competent programmer.

>>>

>>> Edsger W.Dijkstra, 18 June 1975

>>>

>>>

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