[Coco] Drivewire client for OS9/68K

[Bob Devries]

I guess what I meant to say was that the DW driver is a hybrid of (hard) 
disk drive and serial port. It behaves like a disk drive to the system, but 
talks via the serial port.

If we can make this happen it would be good if it can be made fairly 
generic, at least at source level. Perhaps compile time switches could be 
used to determine which serial port is to be used, since the serial drivers 
for the 68070, 68901 and 68681 are quite different. My Secad AS-68K has two 
serial ports on a 68681, as well as the serial ports on the (PC) XT Multio 
card, which are generally 8250 compatible. I have source code for both the 
68681 serial driver and the 8250 driver.

Regards, Bob Devries
Dalby, QLD, Australia


----- Original Message ----- 
From: "Joel Ewy" <jcewy at swbell.net>
To: <coco at maltedmedia.com>
Sent: Tuesday, August 31, 2010 10:59 AM
Subject: Re: [Coco] Drivewire client for OS9/68K


> 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
>>>>
>>>>
>>>> -- 
>>>> Coco mailing list
>>>> Coco at maltedmedia.com
>>>> http://five.pairlist.net/mailman/listinfo/coco
>>>>
>>>
>>>
>>> -- 
>>> Coco mailing list
>>> Coco at maltedmedia.com
>>> http://five.pairlist.net/mailman/listinfo/coco
>>
>>
>> -- 
>> Coco mailing list
>> Coco at maltedmedia.com
>> http://five.pairlist.net/mailman/listinfo/coco
>>
>
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco