[Coco] Level 1 & Drivewire

Sun Jan 3 13:08:14 EST 2016

The reason I ask is Level 2 on the CC3 has a vector ram page that is always present in the 64k space of either task from $fe00-$ffff (basically top of ram) no matter what bank is mapped into logical block 7 or 15 but can be modified.  The CC3 uses block $3f as the base for setting up this area of memory (handled in REL/KRN).

This is where the main IRQ vectors and task switching software sits (the core of Level 2).  I’m wondering does your MMU support this same type of scheme?  or do I have to for now make sure every block of ram has this code by copying. I know you state $ffd0-$ffdf is always hardware.

Bill Nobel

> On Jan 3, 2016, at 8:43 AM, Neal Crook <foofoobedoo at gmail.com> wrote:
> 
> Bill,
> Block 7 of the MMU is slightly different from the others. You can map
> memory into it in the same way as for all the other blocks. However, the
> address region ffd0-ffdf always accesses the I/O devices: any
> underlying/mapped RAM is NOT corrupted. I think that answers your question
> but if I misunderstood please ask again.
> 
> Neal
> I have already been looking at that Neal.  I think doing Level 2 is a
> better first step, as I have been looking at everything you have so far in
> hardware, and it looks like it won’t be that difficult.  I actually think
> Krn will end up smaller than the CC3 version, by your using only 2
> registers on the MMU rather than the CC3’s 16 plus task select register.  I
> am making one assumption though on the MMU your logical block 7 is it the
> same as the CC3 to use physical block $3f for the top of RAM?  The CC3 uses
> physical $3f as the top of memory in the DAT registers for the top of
> hardware and vectors, or is that a value that won’t make a difference what
> is stored in logical block 7.
> 
> Bill Nobel
> 
> 
>> On Jan 2, 2016, at 12:30 PM, Neal Crook <foofoobedoo at gmail.com> wrote:
>> 
>> Hi Bill (Nobel),
>> 
>> I checked the Drivewire spec. and found that it calls for 1 start + 8 data
>> + 1 stop and that 115,200bps is a supported speed.
>> I reviewed the UART RTL and ran an RTL simulation and confirmed that the
>> UART is hard-wired for 1 start + 8 data + 1 stop -- and the default
>> configuration runs at 115,200bps.
>> 
>> In summary, I was incorrect to indicate any hardware impediment. It seems
>> as though "all" that's needed is a version of dwio.asm that writes to a
>> 6850-style UART. Are you interest in working on this?
>> 
>> regards,
>> 
>> Neal.
>> 
>> On 2 January 2016 at 02:22, Chad H <chadbh74 at hotmail.com> wrote:
>> 
>>> Using DriveWire on NitrOS9 level 1 here with my CoCo 2.  Yes, it works
>>> great at 'normal' speed.   Double speed works well in HDBDOS but not with
>>> the current files in the repo.  Something was broken on the newer files.
>>> Should not effect NitrOS9 though.
>>> 
>>> - Chad H
>>> http://sites.google.com/site/cbhlab101/
>>> 
>>> -----Original Message-----
>>> From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Bill Pierce
>>> via Coco
>>> Sent: Thursday, December 31, 2015 9:38 AM
>>> To: coco at maltedmedia.com
>>> Cc: Bill Pierce
>>> Subject: Re: [Coco] Level 1 & Drivewire
>>> 
>>> Bill, the repo "latest" has disk images of NitrOS9 L1 w/dw.
>>> I have used L1 & DW4 with both my Coco 1 & my Coco 2 as well as with
> XRoar.
>>> The only thing is the standard L1 DW distro disk does not leave much
>>> ram... you may need to strip out a few unneeded modules to get some
> memory
>>> back. The Coco 1 disks have dw drivers that run at 38400 baud (due to odd
>>> serial setup) and Coco 2 disk have drivers for 57600 baud (can't double
>>> speed a Coco 2).
>>> 
>>> DriveWire works nicely on NitrOS9 L1 :-)
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> Bill Pierce
>>> "Charlie stole the handle, and the train it won't stop going, no way to
>>> slow down!" - Ian Anderson - Jethro Tull
>>> 
>>> 
>>> 
>>> My Music from the Tandy/Radio Shack Color Computer 2 & 3
>>> https://sites.google.com/site/dabarnstudio/
>>> Co-Contributor, Co-Editor for CocoPedia
>>> http://www.cocopedia.com/wiki/index.php/Main_Page
>>> Global Moderator for TRS-80/Tandy Color Computer Forums
>>> http://www.tandycoco.com/forum/
>>> 
>>> E-Mail: ooogalapasooo at aol.com
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> -----Original Message-----
>>> From: Bill Nobel <b_nobel at hotmail.com>
>>> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
>>> Sent: Thu, Dec 31, 2015 10:01 am
>>> Subject: [Coco] Level 1 & Drivewire
>>> 
>>> Hey All,  I have a question.  Has anybody tried or is it even possible to
>>> use Drivewire on Level 1 Nitros9?I’m curious as I now have Neal Crooks
>>> Level1 Nitros9 with 4 DS Drives setup with 512K Ram (only 64k used under
>>> Level 1) and would like to get the further Drive access and
> communication a
>>> lot better.I have Drivewire Servers already setup and working from
>>> emulators, but wonder if Level1 has the same capability.Bill Nobel-- Coco
>>> mailing listCoco at maltedmedia.comhttps://
>>> pairlist5.pair.net/mailman/listinfo/coco
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