[Coco] Re: Coco Digest, Vol 29, Issue 37
farna at att.net
farna at att.net
Sun Jan 15 11:13:55 EST 2006
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
Behalf Of Torsten Dittel
Sent: Sunday, January 15, 2006 5:21 AM
To: coco at maltedmedia.com
Subject: [Coco] Re: NTSC to VGA.. more common than you think?
Most of will not accept RGBHV input. The one who does is extremely
expensive. Roy's converter is what we need at a more than fair price.
Torsten
And I mentioned Chris, forgot about Roy! That cheap box converts the NTSC to VGA, not RGB. The people using it for games almost all had gamma and ghosting problems, but from my experience (and one reviewer's comment), that is related to the poor shielding on the VGA cable. Remember the composite cable that came with the CoCo? The easiest way to clear the pic up was to replace that with a 75 ohm cable. This appears to have the same problem. But from what I've been hearing, Roy's box will have some adjustments built in if you know how to open the box and tweak it.
I'm not sure an NTSC converter would display clear 80 column text though -- that's the real issue! Converting RGB should.
--
Frank Swygert
Publisher, "American Independent
Magazine" (AIM)
For all AMC enthusiasts
http://farna.home.att.net/AIM.html
(free download available!)
-------------- Original message ----------------------
From: coco-request at maltedmedia.com
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> Today's Topics:
>
> 1. Re: [Color Computer] Floppy contoler Q (Gene Heskett)
> 2. Re: [Color Computer] Floppy contoler Q (Phill Harvey-Smith)
> 3. Re: freeware lint for PC? (Jim Cox)
> 4. Re: [Color Computer] Floppy contoler Q (Paul T. Barton)
> 5. Re: Re: [Color Computer] Floppy contoler Q (Gene Heskett)
> 6. Re: Re: [Color Computer] Floppy contoler Q (Paul T. Barton)
> 7. Re: [Color Computer] Floppy contoler Q (Robert Gault)
> 8. Re: NTSC to VGA.. more common than you think? (Torsten Dittel)
> 9. RE: Re: NTSC to VGA.. more common than you think? (DJ)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 15 Jan 2006 00:15:27 -0500
> From: Gene Heskett <gene.heskett at verizon.net>
> Subject: Re: [Coco] [Color Computer] Floppy contoler Q
> To: coco at maltedmedia.com
> Message-ID: <200601150015.28029.gene.heskett at verizon.net>
> Content-Type: text/plain; charset=us-ascii
>
> On Saturday 14 January 2006 23:47, Robert Gault wrote:
> >Bit6 $FF40 is used by Tandy for drive select 3. However, the
> > connection of this bit to the ribbon cable results in it also being a
> > side select.
> >
> >When single sided drives are used, bit0=drive0, bit1=drive1,
> >bit2=drive2, and bit6=drive3. With double sided drives and without any
> >hardware changes to the controller or ribbon cable, bit0=drive0,
> >bit1=drive1, and bit6= side select.
> >
> >You might think that 3 double sided drives could be used because bit6
> >could be combined with any of the three bits 0, 1, or 2 resulting in
> > 0, 1, 2, $40, $41, or $42. Unfortunately, the controller does not
> > permit that because $00 turns off the drives. That leaves you with 1,
> > $41, 2, and $42 or two double sided drives. You can however, have two
> > double sided drives and one single sided drive at the same time with
> > the third drive selected with $40.
>
> Thats not entirely true Robert. I've been running 3 double sided floppy
> drives on my coco's for nearly 20 years. Os9 does this correctly at
> least, I don't know about DEB and clones as I don't run them. All I
> did was put fully populated connectors on my cables.
>
> --
> Cheers, Gene
> People having trouble with vz bouncing email to me should add the word
> 'online' between the 'verizon', and the dot which bypasses vz's
> stupid bounce rules. I do use spamassassin too. :-)
> Yahoo.com and AOL/TW attorneys please note, additions to the above
> message by Gene Heskett are:
> Copyright 2005 by Maurice Eugene Heskett, all rights reserved.
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 15 Jan 2006 05:40:07 +0000
> From: Phill Harvey-Smith <dragon at aurigae.demon.co.uk>
> Subject: [Coco] Re: [Color Computer] Floppy contoler Q
> To: ColorComputer at yahoogroups.com
> Message-ID: <43C9E037.4090808 at aurigae.demon.co.uk>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Gene Heskett wrote:
> > On Saturday 14 January 2006 23:25, Phill Harvey-Smith wrote:
> >> This infers that this signal can also be used to select the 4th drive,
> >> however I'm unsure of the way this could be done.
> >
> > Yes, however, this is assuming all 4 drives are single sided. Also the
> > drive might have to be programmed for motor on on selection.
>
> So if you have 1..3 drives then Side select is exactly that ? But if you
> have 4 drives they have to be single sided ?
>
> > It also required a jumper to be soldered onto the 4th drive to take it
> > to a valid drive select signal on the drive with the other 3 jumpers or
> > switches set open.
>
> Yeah that makes sense.
>
> >> It may be possible
> >> that the Tandy drives had some off board circuitry that somehowe did
> >> this (or a non standard cable), since I have never actually seen one,
> >> I do not know.
> >
> > Their off board circuitry consisted of removing the connections from the
> > card edge connectors and twisting the cable such that for the first 2
> > drives, both were programmed to be (IIRC) drive 0 (unlike the pc drives
> > that were all drive 1).
>
> But the same idea none the less, I use a similar twist (pins 10 & 12
> IIRC), to undo the bodge and let me use 2xPC 1.44s (as 720) on my
> CoCo/Dragon.
>
> > It simplified things for the assemblers, but
> > made life difficult for us, so we usually installed, or soldered the
> > jumpers to assign the drive number on each drive, and then put fully
> > populated connectors on the drive cable.
>
> Yeah that figures, in other words we use things the way they where
> designed, with a full cable and jumpers.
>
> >> In case anyone wonders what I'm up to, I'm trying to port SuperDos (A
> >> Dragon dos enhancement), to use the RS-Dos hardware, as I figure this
> >> way an RS-Dos cartrage could be used with the Dragon (either the
> >> British one or the Tano).
> >
> > I'd suspect that using the 1773 chip in a rsdos controller might require
> > a software hack to superdos to compensate for the hard wired side
> > select signal in the shack & clones controllers.
>
> And difference in read/write sector commands, IIRC the 1773/1793 encode
> the sector sizes slightly differently, and this affects the exact format
> of the command ($80 on rs, $88 on Dragon for read sec etc).
>
> Yeah I have it disassembled, and am working on it that way with
> conditional assembly I can build for Dragon, Dragon Alpha/Professional &
> hopefully RS-DOS. At the moment it seems to be reading sectors ok,
> just from the wrong side of the disk !
>
> Phill.
>
>
>
> Brought to you by the 6809, the 6803 and their cousins!
> Yahoo! Groups Links
>
> <*> To visit your group on the web, go to:
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>
> <*> To unsubscribe from this group, send an email to:
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>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sat, 14 Jan 2006 21:50:26 -0800
> From: "Jim Cox" <jimcox at miba51.com>
> Subject: Re: [Coco] freeware lint for PC?
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Message-ID: <web-198981977 at treehouse.forest.net>
> Content-Type: text/plain; charset="ISO-8859-1"; format="flowed"
>
> But John, Bob is not your average Windows user and neither
> are most CoCo-Nutz who use Windows :)
>
> -Jim
>
> On Sat, 14 Jan 2006 21:07:17 -0500
> "John W. Linville" <linville at tuxdriver.com> wrote:
> > On Sat, Jan 14, 2006 at 03:47:16PM +1000, Bob Devries
> >wrote:
> >> Does anyone know of a freeware version of "LINT" for dos
> >>or Windows?
> >
> >Friends don't let friends do windows...but if you insist:
> >
> > http://splint.org/win32.html/
> >
> > I didn't think the average windows programmer even
> >cleaned-up compiler
> > warnings, much less used lint? :-)
> >
> > John
> > --
> > John W. Linville
> > linville at tuxdriver.com
> >
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
>
>
>
> ------------------------------
>
> Message: 4
> Date: Sat, 14 Jan 2006 22:06:57 -0800 (PST)
> From: "Paul T. Barton" <idezilla at yahoo.com>
> Subject: Re: [Coco] [Color Computer] Floppy contoler Q
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Message-ID: <20060115060657.3652.qmail at web34303.mail.mud.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> Arthur,
>
> Yes, I agree and also use three DS-DD drives.
>
> Paul - idezilla
>
> --- Arthur Flexser <flexser at fiu.edu> wrote:
>
> --snipped--
>
> > I think you goofed here.
> > While the bits for DS0, DS1, and DS2 are bits 0, 1,
> > and 2, setting each one results in $FF40
> > values of 1, 2, and 4, so the
> > corresponding double sided versions would be
> > $41, $42, and $44. So, I don't see
> > any problem with connecting 3 double-sided drives.
> >
> > Art
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>
>
> ------------------------------
>
> Message: 5
> Date: Sun, 15 Jan 2006 01:16:27 -0500
> From: Gene Heskett <gene.heskett at verizon.net>
> Subject: Re: [Coco] Re: [Color Computer] Floppy contoler Q
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Message-ID: <200601150116.28733.gene.heskett at verizon.net>
> Content-Type: text/plain; charset=us-ascii
>
> On Sunday 15 January 2006 00:40, Phill Harvey-Smith wrote:
> >Gene Heskett wrote:
> >> On Saturday 14 January 2006 23:25, Phill Harvey-Smith wrote:
> >>> This infers that this signal can also be used to select the 4th
> >>> drive, however I'm unsure of the way this could be done.
> >>
> >> Yes, however, this is assuming all 4 drives are single sided. Also
> >> the drive might have to be programmed for motor on on selection.
> >
> >So if you have 1..3 drives then Side select is exactly that ? But if
> > you have 4 drives they have to be single sided ?
> >
> Yup, if you're using the side select as drive 4, then it cannot be on
> when accessing the other 3 drives, hence they must be SS drives.
>
> >> It also required a jumper to be soldered onto the 4th drive to take
> >> it to a valid drive select signal on the drive with the other 3
> >> jumpers or switches set open.
> >
> >Yeah that makes sense.
> >
> >>> It may be possible
> >>> that the Tandy drives had some off board circuitry that somehowe
> >>> did this (or a non standard cable), since I have never actually
> >>> seen one, I do not know.
> >>
> >> Their off board circuitry consisted of removing the connections from
> >> the card edge connectors and twisting the cable such that for the
> >> first 2 drives, both were programmed to be (IIRC) drive 0 (unlike
> >> the pc drives that were all drive 1).
> >
> >But the same idea none the less, I use a similar twist (pins 10 & 12
> >IIRC), to undo the bodge and let me use 2xPC 1.44s (as 720) on my
> >CoCo/Dragon.
> >
> >> It simplified things for the assemblers, but
> >> made life difficult for us, so we usually installed, or soldered the
> >> jumpers to assign the drive number on each drive, and then put fully
> >> populated connectors on the drive cable.
> >
> >Yeah that figures, in other words we use things the way they where
> >designed, with a full cable and jumpers.
> >
> >>> In case anyone wonders what I'm up to, I'm trying to port SuperDos
> >>> (A Dragon dos enhancement), to use the RS-Dos hardware, as I figure
> >>> this way an RS-Dos cartrage could be used with the Dragon (either
> >>> the British one or the Tano).
> >>
> >> I'd suspect that using the 1773 chip in a rsdos controller might
> >> require a software hack to superdos to compensate for the hard wired
> >> side select signal in the shack & clones controllers.
> >
> >And difference in read/write sector commands, IIRC the 1773/1793
> > encode the sector sizes slightly differently, and this affects the
> > exact format of the command ($80 on rs, $88 on Dragon for read sec
> > etc).
>
> Interesting. Have you looked at the Fujitsu MB8877. Its supposed to be
> a cmos workalike to the 1793 from what I've read but that was years
> ago. It was used in at least one coco controller, maybe two.
>
> >Yeah I have it disassembled, and am working on it that way with
> >conditional assembly I can build for Dragon, Dragon Alpha/Professional
> > & hopefully RS-DOS. At the moment it seems to be reading sectors ok,
> > just from the wrong side of the disk !
> >
> >Phill.
> >
> >
> >
> >Brought to you by the 6809, the 6803 and their cousins!
> >Yahoo! Groups Links
> >
> ><*> To visit your group on the web, go to:
> > http://groups.yahoo.com/group/ColorComputer/
> >
> ><*> To unsubscribe from this group, send an email to:
> > ColorComputer-unsubscribe at yahoogroups.com
> >
> ><*> Your use of Yahoo! Groups is subject to:
> > http://docs.yahoo.com/info/terms/
>
> --
> Cheers, Gene
> People having trouble with vz bouncing email to me should add the word
> 'online' between the 'verizon', and the dot which bypasses vz's
> stupid bounce rules. I do use spamassassin too. :-)
> Yahoo.com and AOL/TW attorneys please note, additions to the above
> message by Gene Heskett are:
> Copyright 2005 by Maurice Eugene Heskett, all rights reserved.
>
>
> ------------------------------
>
> Message: 6
> Date: Sat, 14 Jan 2006 22:48:51 -0800 (PST)
> From: "Paul T. Barton" <idezilla at yahoo.com>
> Subject: Re: [Coco] Re: [Color Computer] Floppy contoler Q
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Message-ID: <20060115064851.17833.qmail at web34303.mail.mud.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> Yup, 25-3xx9
>
> MB8877 - (? - earlier design?)
> MB8877A - (works for 2HD drives)
> MB8876A - (inverted data bus)
>
> All commands in Disk Basic work great!
> And it's +5v only, no +12v needed.
>
> > Interesting. Have you looked at the Fujitsu MB8877.
> > Its supposed to be a cmos workalike to the 1793 from
> > what I've read but that was years ago. It was used
> > in at least one coco controller, maybe two.
>
> Paul - idezilla
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>
>
> ------------------------------
>
> Message: 7
> Date: Sun, 15 Jan 2006 06:07:48 -0500
> From: Robert Gault <robert.gault at worldnet.att.net>
> Subject: Re: [Coco] [Color Computer] Floppy contoler Q
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Message-ID: <43CA2D04.5070407 at worldnet.att.net>
> Content-Type: text/plain; charset=us-ascii; format=flowed
>
> Indeed, 1, 2, 4, $41, $42, $44, $40 could be used to indicate drives.
> I'm not sure what the result might be as I've not had a setup like that.
>
> Arthur Flexser wrote:
>
> > Come to think of it, I guess you could also connect a fourth drive as
> > single-sided, in addition to the three double-sided ones, right?
> >
> > Art
> >
> > On Sat, 14 Jan 2006, Robert Gault wrote:
> >
> >
> >>Thanks Art. You are quite correct and I was sloppy.
> >>
>
>
>
> ------------------------------
>
> Message: 8
> Date: Sun, 15 Jan 2006 12:20:40 +0100
> From: Torsten Dittel <Torsten at Dittel.info>
> Subject: [Coco] Re: NTSC to VGA.. more common than you think?
> To: coco at maltedmedia.com
> Message-ID: <43CA3007.9B572525 at Dittel.info>
> Content-Type: text/plain; charset=us-ascii
>
> Most of will not accept RGBHV input. The one who does is extremely
> expensive. Roy's converter is what we need at a more than fair price.
> Torsten
>
>
>
> ------------------------------
>
> Message: 9
> Date: Sun, 15 Jan 2006 08:24:40 -0600
> From: "DJ" <dj at isectran.com>
> Subject: RE: [Coco] Re: NTSC to VGA.. more common than you think?
> To: "'CoCoList for Color Computer Enthusiasts'" <coco at maltedmedia.com>
> Message-ID: <jzxlmags0ng8hpx.150120060824 at mail.isectran.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Never said it wasn't =) And I look forward to seeing it available, I'll
> definitely tell other coco, (Or anyone that has an RGB computer) about it if
> he wants the word spread.
>
> DJ
>
>
> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
> Behalf Of Torsten Dittel
> Sent: Sunday, January 15, 2006 5:21 AM
> To: coco at maltedmedia.com
> Subject: [Coco] Re: NTSC to VGA.. more common than you think?
>
> Most of will not accept RGBHV input. The one who does is extremely
> expensive. Roy's converter is what we need at a more than fair price.
> Torsten
>
>
> --
> 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
>
>
> End of Coco Digest, Vol 29, Issue 37
> ************************************
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