K. Pruitt | 30 Jul 00:58 2015

Different versions of the RS-232 Pak?

We're there two different versions of the RS-232 Pak made?

I have my original pak and none of the chips are socketed. I just picked up 
another pak which has never been opened, and when I look down in to it I can 
see what appears to be a socketed chip. Is this the ROM chip perhaps? If so, 
can I remove that chip completely and put a clock chip in to it? I currently 
have my clock chip in my Disto SC-II, but it's a real tight fit as it is 
stacked with the ROM.

The difference in these two RS-232 Paks are slight. The printing is larger 
on the one with the suspected socketed chip and the label on the back is in 
the middle of the Pak rather than down near the cartridge connector as on 
the 100% non-socketed version.

Any input is appreciated. Thanks.

--

-- 
Coco mailing list
Coco <at> maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco
Mark J. Blair | 29 Jul 06:39 2015
Picon

Four floppy drives?

Please forgive me if this has been addressed before. Did any of the floppy disk systems made for the Color
Computer support four floppy drives in their standard configuration?

The hardware documentation refers to four drive select lines, but the fourth line (variously called drive
select 3 or drive select 4, depending on whether an author used 0-based or 1-based numbering) of the Radio
Shack controllers was connected to drive pin 32, which is the side select line for standard Shugart
interface double-sided drives. Pin 6, which is the fourth drive select line on standard (non-IBM style)
Shugart interfaces, is left open. The first three drive select lines are connected to pins 10, 12 and 14,
which is normal for Shugart interface drives. The fourth drive select bit of the control register is not
adjacent to the first three, almost as if it was an afterthought.

This makes it easy to connect up to three double-sided drives to a standard Radio Shack controller and then
use double-sided disks with patched ROMs or different operating systems. But did the original Radio
Shack single-sided, 35-track systems support 4 drives? And if so, did they use nonstandard drives which
used pin 32 as the fourth drive select line instead of pin 6?

Using drives with the standard Shugart pinout, only three single or double sided drives could be used with a
straight-through ribbon cable. A fourth drive could be used if all drives are single-sided and the cable
is rewired to move pin 32 on the controller to pin 6 on the drives. Four double-sided drives wouldn't work
with a standard Radio Shack controller, because there aren't enough control lines available.

Did any of the aftermarket controllers map the fourth drive select to pin 6, add an additional control line
to allow four double-sided drives, or have any other interesting variations compared to the Radio Shack ones?

Last, but not least, are any of y'all aware of Radio Shack's reasoning for mapping the fourth drive select
signal to pin 32 instead of pin 6?

--

-- 
Mark J. Blair, NF6X <nf6x <at> nf6x.net>
http://www.nf6x.net/
(Continue reading)

Randall Kindig | 29 Jul 03:38 2015
Picon

Floppy Days Podcast #42 - The TRS-80 Model III, 4 - with co-host Michael Nadeau

The TRS-80 Model III and 4 
 http://floppydays.libsyn.com/floppy-days-42-trs-80-model-iii-4-michael-nadeau <http://floppydays.libsyn.com/floppy-days-42-trs-80-model-iii-4-michael-nadeau>
On the personal computer timeline, we’re currently in the 1979 to 1980 time frame.  I do apologize that
this month’s topic, the TRS-80 Model III and 4, is being presented slightly out of order in that there
were a couple of machines introduced a little prior to this that I plan to cover.  However, as I already had
this one recorded I decided to present it now rather than hold up publishing an episode just to maintain a
precise order. 

As usual, I have a short preamble before we get into this month’s topic, covering new acquisitions,
upcoming shows, and a little bit of feedback. 

I was lucky enough to get author ("Collectible Microcomputers") and vintage computer collector Michael
Nadeau to agree to co-host this episode with me, so this should be a fun and interesting episode. 

Randy Kindig
host Floppy Days, floppydays.com

--

-- 
Coco mailing list
Coco <at> maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco
Josh Harper via Coco | 29 Jul 03:32 2015

retrobrite

 Retrobrited some coco 2 keyboards,, what do u think

https://www.facebook.com/groups/2359462640/

--

-- 
Coco mailing list
Coco <at> maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco
Darren A | 27 Jul 19:23 2015
Picon

MC-11 Status Update

Thanks to Ed (Zippster), the first MC-11 board was assembled. A simple test
to execute code and display video was a success!

Photo:
<https://flic.kr/p/wgHxRU>

- Darren

--

-- 
Coco mailing list
Coco <at> maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco
Raymond Jett via Coco | 27 Jul 17:17 2015

Re: Source for CoCo 3 Rubber Feet

I have a small number (about a dozen) of the round plastic feet that have the push pin in the middle to hold them
in place. 

They were a perfect fit on my CoCo 3 which had the little holes in the bottom for the pin to fit in.

Raymond

Date: Sun, 26 Jul 2015 20:53:57 -0700
From: Steve Batson <steve_batson <at> yahoo.com>
To: CoCoList for Color Computer Enthusiasts <coco <at> maltedmedia.com>
Subject: Re: [Coco] Source for CoCo 3 Rubber Feet
Message-ID: <64D6CC9A-0824-4001-8F3A-24EAAA0A0C86 <at> yahoo.com>
Content-Type: text/plain; charset=us-ascii

I found some very much like what is on the CoCo at a Local Ace Hardware Store. They were white instead of Black,
but very close in size and shape. They work great. It was a pack of at least 8, I don't recall.

On Jul 26, 2015, at 7:10 PM, Richard Goedeken <Richard <at> fascinationsoftware.com> wrote:

> I was recently looking for the same thing, and I ended up buying these:
> 
> http://www.ebay.com/itm/281033730630
> 
> They aren't exactly the same.  They are not as 'slippery' as the original Coco
> feet (the flat ones, not the rubber hemisphere ones) and they are not quite as
> tall either, but they at least keep the bottom of the case off of the table.
> 
> Ricahrd
> 
> On 07/25/2015 12:25 AM, K. Pruitt wrote:
(Continue reading)

Bill | 27 Jul 17:10 2015
Picon

split in cable

Remind me again-where is the split (after the 9th strand-starting with 10 ?)
in the cable to make a 3.5" act as a drive 0, and how many strands (10-12:3
or 10-13:4) does it cover?

--

-- 
Coco mailing list
Coco <at> maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco
Brian Smith | 27 Jul 09:08 2015
Picon

Working COCO3 for sale

I posted my last working coco3 for sale on eBay. Just don't have time or
space for it anymore.
Man I sure miss the good ole days when you didn't need an engineering degree
to build an add on project, like converting that disto 1 meg board to a 2
meg board. That was a sight to see. The top 512k board had 3 chips stacked
in each socket with the top 2 chip selects bent out and tied together to
make the bank select. It sure did work though but was a lot of soldering.
I better stop thinking about it before I decide not to sell it :(
Wonder if anybody still uses that patch I made to ident so instead of
listing a 6309 module as ????, it would say 6309 obj just like the 6809 obj.
I believe they gave 6309 patched modules a type 09 which anything over 08
printed ????. I just added 6309 obj for 09 and recompiled.
Brian
bsmith41 <at> cfl.rr.com

--

-- 
Coco mailing list
Coco <at> maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco
Barry Nelson | 27 Jul 09:08 2015

Re: Error 214

/dd/cmds/asm

Usage:

asm file o=outputfile #40k

On Jul 26, 2015, at 8:56 PM, coco-request <at> maltedmedia.com wrote:

> Date: Sun, 26 Jul 2015 09:15:32 -0400
> From: "Bill" <cwgordon <at> carolina.rr.com>
> To: "'CoCoList for Color Computer Enthusiasts'" <coco <at> maltedmedia.com>
> Subject: Re: [Coco] Error 214
> Message-ID: <00ca01d0c7a5$270eb170$752c1450$ <at> rr.com>
> Content-Type: text/plain;	charset="utf-8"
> 
> Sorry, just realized that edtasm++ is an RSDOS file, and I'm trying to access it with NitrOS-9. My bad...
> What is the equivalent of edtasm for NitrOS-9?
> Thanks
> 
> -----Original Message-----
> From: Coco [mailto:coco-bounces <at> maltedmedia.com] On Behalf Of Bill
> Sent: Sunday, July 26, 2015 9:11 AM
> To: Coco Enthusiasts
> Subject: [Coco] Error 214
> 
> I just downloaded edtasm++.dsk, installed it into Drivewire, drive 1, tried to access it from the Coco,
and got an ERROR 214. 
> 
> 
> 
(Continue reading)

Al Hartman | 27 Jul 03:15 2015
Picon

Fixing my TDP-100...

I was bidding on a Coco on eBay that had an HJL keyboard, and I was hoping an “F” board, and it had no bids on
it the whole time. I made a bid an the last few minutes, and I was on the phone and forgot to refresh. Someone
beat me out of it by $1.00.

Darn!’

I really needed that keyboard, and that logic board to fix my TDP.

-[ Al ]-

--

-- 
Coco mailing list
Coco <at> maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco
Al Hartman | 27 Jul 02:54 2015
Picon

My Tano Dragon 64

I found my pair of 27128 EPROMs, confirmed they were blank, and burned them with the images of the IC17 and
IC18 TANO Dragon 64k ROMs.

Tomorrow, I need to find the Power Supply for the Dragon, and I'm ready to test it.

Next, I’d like to get one of those DragonDOS controllers from the guy in Spain.

-[ Al ]-

--

-- 
Coco mailing list
Coco <at> maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco

Gmane