Date   
Re: Needs help on ElfOS

Rizal Acob
 

Thanks...will try reading again the manuals...

Re: RCA MCDS Tape I/O Board Question

Lee Hart
 

gregory simmons via Groups.Io wrote:
Love the "Altaids 8800" on the clever magazine cover. For the record,
it might be worth mentioning that the most recent issue of Nuts and
Volts Magazine (2019, issue 3) has an article by David Hunter in which
he presents his "Altaids Computer", an 8085-based computer that looks
much like Lee's amazing Membership Card computers.
Thanks, Greg. :-)

Yes, I saw David Hunter's "Altaid" computer. Very clever! He simplified things a lot to fit on a single board (by using an 8085, eliminating the front panel, etc.)

He is probably unaware of our work. Josh and I have been working on our Altaid 8800 about 3 years, and it's been on my website for at least 2 years.

The reason for the retro-magazine is to get people to actually *read* the manual. I'll put it on my web page <http://www.sunrise-ev.com/8080.htm>. It's not finished, but you can get a "feel" for the project.

Lee
--
Nothing is foolproof because fools are so darn clever. -- Anonymous
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com

Re: Needs help on ElfOS

ajparent1/kb1gmx
 

Did you scan the manuals?

The manuals indicate many ways but one has to understand hardware and software.

EXEC 8000h  (execute a program at 8000h) as the EPROM that has monitor and
all the eprom resident facilities including the ELFOS boot has an origin address at 8000h (0x8000).

A call to ROM BASIC would be the same save for the address is that of the
BASIC in rom ( I could look it up for you).

Allison

Re: RCA MCDS Tape I/O Board Question

ajparent1/kb1gmx
 

Yes and no.

First crediting the design to work off solar panels should the battery fail is false.
Very few do as the solar output of a tumbling spacecraft averages lower than 
solar capability built on to the surface.

Oscar-7 went dead in the 70s when one of more cells shorted (nicd) and the 
power was insufficient to run the timer/housekeeping subsystem.  After many
decades the batteries dried out and became open allowing the systems to run
on solar power with a few yabuts... 

Any time it goes into Earths shadow it resets.  When it comes out of shadow
it can be in one of several modes and generally unpredictable though it seems
to favor one.  The other is anytime the power needs peak (including response
to over strong signals) it gets frequency unstable and may even reset.

It was never designed to run exclusively off the solar panels, there weren't
enough of them.  That it does and is still running says a lot.

I might add a lot of the birds up there that are dead likely have shorted cells
in the battery.  The usual approved batteries are costly and have just a limited
number of charge recharge cycles before they fail.  NOTE: that is typically
every orbit and an orbit every 89-95 minutes so its easy to accumulate
thousands (`5400) of cycles in a year. 

A much later (recent- FOX2) designed sat system has the ability to manage
multiple batteries and a more intelligent power system.  I know the designers.
Design for spaceflight is not as easy as it appears and the approvals often
needed (range safety and a intrinsic safe systems as they are not the only
paying payload) force designers to go analog when it would seem digital is
better but  more often than not radiation resistant so susceptibility to solar
storms (rad hard) systems are an issue (and cost).

Allison

Re: RCA MCDS Tape I/O Board Question

gregory simmons
 

Love the "Altaids 8800" on the clever magazine cover.  For the record, it might be worth mentioning that the most recent issue of Nuts and Volts Magazine (2019, issue 3) has an article by David Hunter in which he presents his "Altaids Computer", an 8085-based computer that looks much like Lee's amazing Membership Card computers.

On Friday, November 22, 2019, 08:34:35 AM EST, Raymond Sills via Groups.Io <raysills3@...> wrote:


Hi Lee:

This week's ARRL newsletter mentions that OSCAR-7 =IS= the oldest still-working communications satellite.   Period.  Commercial, military, whatever... OSCAR-7 is the King.  

It's nice to know that the designers of OSCAR-7 engineered it so that when the batteries gave out (as all batteries eventually do), that the satellite would be able to run via its solar panels, and that there was sufficient capability to power the bird.  Yay for Amateur Radio.  :)    

73 de Ray
K2ULR



-----Original Message-----
From: Lee Hart <leeahart@...>
To: cosmacelf <cosmacelf@groups.io>
Sent: Thu, Nov 21, 2019 10:16 pm
Subject: Re: [cosmacelf] RCA MCDS Tape I/O Board Question

ajparent1/kb1gmx wrote:
> Thats good. I blame all things good and crazy on PE.

Wayne Greene's 73 Magazine was another good one for mad ideas. It was a ham
radio magazine ("73" is ham shortcut for "hello!"

> Funny coincidence... my IC245 a new or fairly new radio when Oscar was
> launched was taken apart decades ago for modes to work Oscar 7 and
> given to me a week after it woke up again.

OSCAR-7 is a great comeback story (look it up on wikipedia). Launched in 1975,
it worked for many years until its batteries gave out.

The batteries eventually got so bad that the satellite quit trying to charge
them with its solar panels. Then "voila" OSCAR-7 came back to life! It only
worked when it was in sunlight; but there's a lot of that in space. :-)

During the fall of the Soviet Union, The Polish Solidarity movement used OSCAR-7
to secretly send messages between its chapters without the KGB's knowledge.

OSCAR-7 is still working today! It is perhaps the oldest communications
satellite still in operation.

Lee N8DUA
--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com



Re: RCA MCDS Tape I/O Board Question

Peter Renaud
 

Could you send me the article as well. please?


From: cosmacelf@groups.io <cosmacelf@groups.io> on behalf of Lee Hart <leeahart@...>
Sent: Friday, November 22, 2019 9:40 AM
To: cosmacelf@groups.io <cosmacelf@groups.io>
Subject: Re: [cosmacelf] RCA MCDS Tape I/O Board Question
 
Hank Riley via Groups.Io wrote:
> I knew that it was fake, but the magazine banner looked like a font that
> wouldn't be available in graphics software.
>
> So it looked like the banner segment was taken from a real magazine.

That's the effect I'm trying to achieve. I guess it was successful. :-)

Popular Electronics and Radio-Electronics were "warring" publications in
the early days. Each tried to "scoop" the other with ever more
impressive projects. So I combined the two names into one.

The idea is that the Altaid 8800 could have been built in the 1970's if
we had thought of it. So could my 1802 or Z80 Membership Cards, for that
matter.

If you send me your email address, I can send you the whole article. To
document this NOS Altaid 8800, the manual starts off with the reprint
from a magazine from 1976.

Lee

--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com



Re: RCA MCDS Tape I/O Board Question

Peter Renaud
 

Wouldn't a diode prevent power loss from the solar panels if the batteries shorted to ground.



From: cosmacelf@groups.io <cosmacelf@groups.io> on behalf of Lee Hart <leeahart@...>
Sent: Friday, November 22, 2019 9:50 AM
To: cosmacelf@groups.io <cosmacelf@groups.io>
Subject: Re: [cosmacelf] RCA MCDS Tape I/O Board Question
 
Raymond Sills via Groups.Io wrote:
> Hi Lee:
>
> This week's ARRL newsletter mentions that OSCAR-7 =IS= the oldest
> still-working communications satellite.   Period.  Commercial, military,
> whatever... OSCAR-7 is the King.

Amazing!

> It's nice to know that the designers of OSCAR-7 engineered it so that
> when the batteries gave out (as all batteries eventually do), that the
> satellite would be able to run via its solar panels, and that there was
> sufficient capability to power the bird.  Yay for Amateur Radio.  :)

I don't know if it was engineering, or luck. They were probably nicad
batteries, which tend to fail shorted. Their failure would short the
power supply (PV panels), and prevent operation of the electronics.

But maybe once all the cells shorted, the PV current was high enough to
blow a fuse, or maybe years of current into the dead batteries
eventually caused one to corrode or fail as an open circuit. That would
restore power the the electronics.

Sorry for wandering so far off-topic on this thread!

Lee

--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com



Re: RCA MCDS Tape I/O Board Question

Lee Hart
 

Raymond Sills via Groups.Io wrote:
Hi Lee:

This week's ARRL newsletter mentions that OSCAR-7 =IS= the oldest
still-working communications satellite. Period. Commercial, military,
whatever... OSCAR-7 is the King.
Amazing!

It's nice to know that the designers of OSCAR-7 engineered it so that
when the batteries gave out (as all batteries eventually do), that the
satellite would be able to run via its solar panels, and that there was
sufficient capability to power the bird. Yay for Amateur Radio. :)
I don't know if it was engineering, or luck. They were probably nicad batteries, which tend to fail shorted. Their failure would short the power supply (PV panels), and prevent operation of the electronics.

But maybe once all the cells shorted, the PV current was high enough to blow a fuse, or maybe years of current into the dead batteries eventually caused one to corrode or fail as an open circuit. That would restore power the the electronics.

Sorry for wandering so far off-topic on this thread!

Lee

--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com

Re: RCA MCDS Tape I/O Board Question

Lee Hart
 

jgalinat2004 wrote:
Actually for the sake of accuracy, 73 is usually sent in closing and
means "Best regards"

Jeff Galinat - N2KWK 73
Thanks Jeff. Boy, it's been too long since I was a ham, and I forgot! I let my license lapse in the 1980's when I got lured away by computers.

Lee
73 OM

--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com

Re: RCA MCDS Tape I/O Board Question

Lee Hart
 

Hank Riley via Groups.Io wrote:
I knew that it was fake, but the magazine banner looked like a font that
wouldn't be available in graphics software.

So it looked like the banner segment was taken from a real magazine.
That's the effect I'm trying to achieve. I guess it was successful. :-)

Popular Electronics and Radio-Electronics were "warring" publications in the early days. Each tried to "scoop" the other with ever more impressive projects. So I combined the two names into one.

The idea is that the Altaid 8800 could have been built in the 1970's if we had thought of it. So could my 1802 or Z80 Membership Cards, for that matter.

If you send me your email address, I can send you the whole article. To document this NOS Altaid 8800, the manual starts off with the reprint from a magazine from 1976.

Lee

--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com

Re: RCA MCDS Tape I/O Board Question

Arthur Elsenaar
 

Perhaps a fun fact about OSCAR-4 as quoted from the VHF-UHF Manual by Evans & Jessop:
"OSCAR-4
This was launched on 21 December 1965 and carried a 2m to 70cm transponder. Unfortunately the satellite failed to achieve its correct orbit and only operated long enough for a bout a dozen two-way contacts to be made. However, Oscar 4 does have the distinction of providing the first direct satellite communications link between the United States and the Soviet Union."
Yay for amateur radio indeed.
Perhaps we're getting too much off topic now..
Arthur


‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Friday, November 22, 2019 2:34 PM, Raymond Sills via Groups.Io <raysills3@...> wrote:

Hi Lee:

This week's ARRL newsletter mentions that OSCAR-7 =IS= the oldest still-working communications satellite.   Period.  Commercial, military, whatever... OSCAR-7 is the King.  

It's nice to know that the designers of OSCAR-7 engineered it so that when the batteries gave out (as all batteries eventually do), that the satellite would be able to run via its solar panels, and that there was sufficient capability to power the bird.  Yay for Amateur Radio.  :)    

73 de Ray
K2ULR



-----Original Message-----
From: Lee Hart <leeahart@...>
To: cosmacelf <cosmacelf@groups.io>
Sent: Thu, Nov 21, 2019 10:16 pm
Subject: Re: [cosmacelf] RCA MCDS Tape I/O Board Question


ajparent1/kb1gmx wrote:
> Thats good. I blame all things good and crazy on PE.

Wayne Greene's 73 Magazine was another good one for mad ideas. It was a ham
radio magazine ("73" is ham shortcut for "hello!"

> Funny coincidence... my IC245 a new or fairly new radio when Oscar was
> launched was taken apart decades ago for modes to work Oscar 7 and
> given to me a week after it woke up again.

OSCAR-7 is a great comeback story (look it up on wikipedia). Launched in 1975,
it worked for many years until its batteries gave out.

The batteries eventually got so bad that the satellite quit trying to charge
them with its solar panels. Then "voila" OSCAR-7 came back to life! It only
worked when it was in sunlight; but there's a lot of that in space. :-)

During the fall of the Soviet Union, The Polish Solidarity movement used OSCAR-7
to secretly send messages between its chapters without the KGB's knowledge.

OSCAR-7 is still working today! It is perhaps the oldest communications
satellite still in operation.

Lee N8DUA
--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com



Re: RCA MCDS Tape I/O Board Question

Raymond Sills
 

Hi Lee:

This week's ARRL newsletter mentions that OSCAR-7 =IS= the oldest still-working communications satellite.   Period.  Commercial, military, whatever... OSCAR-7 is the King.  

It's nice to know that the designers of OSCAR-7 engineered it so that when the batteries gave out (as all batteries eventually do), that the satellite would be able to run via its solar panels, and that there was sufficient capability to power the bird.  Yay for Amateur Radio.  :)    

73 de Ray
K2ULR



-----Original Message-----
From: Lee Hart <leeahart@...>
To: cosmacelf <cosmacelf@groups.io>
Sent: Thu, Nov 21, 2019 10:16 pm
Subject: Re: [cosmacelf] RCA MCDS Tape I/O Board Question

ajparent1/kb1gmx wrote:
> Thats good. I blame all things good and crazy on PE.

Wayne Greene's 73 Magazine was another good one for mad ideas. It was a ham
radio magazine ("73" is ham shortcut for "hello!"

> Funny coincidence... my IC245 a new or fairly new radio when Oscar was
> launched was taken apart decades ago for modes to work Oscar 7 and
> given to me a week after it woke up again.

OSCAR-7 is a great comeback story (look it up on wikipedia). Launched in 1975,
it worked for many years until its batteries gave out.

The batteries eventually got so bad that the satellite quit trying to charge
them with its solar panels. Then "voila" OSCAR-7 came back to life! It only
worked when it was in sunlight; but there's a lot of that in space. :-)

During the fall of the Soviet Union, The Polish Solidarity movement used OSCAR-7
to secretly send messages between its chapters without the KGB's knowledge.

OSCAR-7 is still working today! It is perhaps the oldest communications
satellite still in operation.

Lee N8DUA
--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com



Re: RCA MCDS Tape I/O Board Question

jgalinat2004
 

Actually for the sake of accuracy, 73 is usually sent in closing and
means "Best regards"

Jeff Galinat - N2KWK
73

On 11/22/2019 12:15 AM, Lee Hart wrote:

Wayne Greene's 73 Magazine was another good one for mad ideas. It was
a ham radio magazine ("73" is ham shortcut for "hello!"

Re: RCA MCDS Tape I/O Board Question

Hank Riley
 

I knew that it was fake, but the magazine banner looked like a font that wouldn't be available in graphics software.

So it looked like the banner segment was taken from a real magazine.

________________________________________________________________________

On Friday, Lee Hart  wrote:

It's a joke, Hank. :-) I had a photo of Josh with his Altair computers,
and used it to hack together a fake magazine cover.

Needs help on ElfOS

Rizal Acob
 

I have been testing my Elf2k for a while now with ElfOS successfully running from CF. However for being so noob on the OS, I can’t seem to find How to EXIT from ElfOS and go back to ROM commands. Also , nowhere I can find how to call BASIC from inside of ElfOS. I have scanned most Elf2k topics here but still the same where I started. HELP

Re: RCA MCDS Tape I/O Board Question

Lee Hart
 

Hank Riley via Groups.Io wrote:
Was this a Canadian magazine? It's not P-E and it's not Radio
Electronics. Google has been no help.
It's a joke, Hank. :-) I had a photo of Josh with his Altair computers, and used it to hack together a fake magazine cover.

He and I are working on an Altair 8800 clone that fits in an Altoids tin. We call it the "Altaid 8800".

Lee

--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com

Re: RCA MCDS Tape I/O Board Question

Hank Riley
 

Was this a Canadian magazine?  It's not P-E and it's not Radio Electronics.  Google has been no help.

______________________________________________________________________________


OH,  I remember that issue of Popular Radio Electronics!  Great times!

Re: RCA MCDS Tape I/O Board Question

Lee Hart
 

ajparent1/kb1gmx wrote:
Thats good. I blame all things good and crazy on PE.
Wayne Greene's 73 Magazine was another good one for mad ideas. It was a ham radio magazine ("73" is ham shortcut for "hello!"

Funny coincidence... my IC245 a new or fairly new radio when Oscar was
launched was taken apart decades ago for modes to work Oscar 7 and
given to me a week after it woke up again.
OSCAR-7 is a great comeback story (look it up on wikipedia). Launched in 1975, it worked for many years until its batteries gave out.

The batteries eventually got so bad that the satellite quit trying to charge them with its solar panels. Then "voila" OSCAR-7 came back to life! It only worked when it was in sunlight; but there's a lot of that in space. :-)

During the fall of the Soviet Union, The Polish Solidarity movement used OSCAR-7 to secretly send messages between its chapters without the KGB's knowledge.

OSCAR-7 is still working today! It is perhaps the oldest communications satellite still in operation.

Lee N8DUA
--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com

Re: RCA MCDS Tape I/O Board Question

ajparent1/kb1gmx
 

Thats good.  I blame all things good and crasy on PE.

Funny coincidence... my IC245 a new or fairly new radio when Oscar was
launched  was taken apart decades ago for modes to work Oscar 7 and
given to me a week after it woke up again.  Needless to say it was both
fixed and modded for that. and would work through that Oscar.

Allison

Re: RCA MCDS Tape I/O Board Question

joshbensadon
 

OH, I remember that issue of Popular Radio Electronics!  Great times!



From: cosmacelf@groups.io <cosmacelf@groups.io> on behalf of Lee Hart <leeahart@...>
Sent: Thursday, November 21, 2019 6:57 PM
To: cosmacelf@groups.io <cosmacelf@groups.io>
Subject: Re: [cosmacelf] RCA MCDS Tape I/O Board Question
 
Peter Renaud wrote:
> Here I am with Marilyn!

That doesn't look like Josh. Here he is with his REAL love. :-)

Lee

--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com