27 Nov
2001
27 Nov
'01
1:44 a.m.
If I remember correctly, there was a machine code
program
printed once to play "music" with a ZX80 using this method!
Older. Dr. Dobb's Journal, Issue #2... 8080 code, played
Daisy and something else, modulating the S-100 INT signal.
-dq
27 Nov
27 Nov
3:42 p.m.
I toggled Daisy into a Imsai 8080, probably from Dr. Dobbs. I then wrote a
music "compiler" in BASIC for my SWTPC 6800. You could enter three octives
of notes and it would generate a data table for the song. I drove the output
buffers on the parallel port. You just had to put your radio near the
computer.
These systems made so much radio interferance the FCC had to come out with
standards. I remember an FCC report the mentioned the SWTPC 6800 as one of
the offenders. (The Apple II switching power supply was a radio transmitter
that also put out 5 volts.)
In the early 1990s I used a Xilinx FPGA demo board and made a Music circuit
chip that blinked the LEDs at 1 Mhz. The one chip, battery operated board
would transmit for several feet. Being a RAM based FPGA, you could download
song after song. (I converted my music compiler from BASIC to C.)
-----------------------------------------------
Michael Holley
http://www.swtpc.com/mholley/index.html
-----------------------------------------------
----- Original Message -----
From: "Douglas Quebbeman" <dhquebbeman(a)theestopinalgroup.com>
To: <classiccmp(a)classiccmp.org>
Sent: Tuesday, November 27, 2001 7:44 AM
Subject: RE: AM radio music
If I remember
correctly, there was a machine code program
printed once to play "music" with a ZX80 using this method!
Older. Dr. Dobb's Journal, Issue #2... 8080 code, played
Daisy and something else, modulating the S-100 INT signal.
-dq
9 Dec
9 Dec
10:48 a.m.
On Tue, Nov 27, 2001 at 10:44:52AM -0500, Douglas Quebbeman wrote:
"Fool on the Hill"?
_Hackers_ by Steven Levy describes how Steve Dompier wrote a music
program for the Altair and transcribed "Fool on the Hill" and
"Daisy".
When he actually wanted to demonstrate it, he had to find an extension
cord (the only good outlet was one floor down). Then two kids tripped
over the extension cord, so he had to toggle in his program twice.
"Daisy" was the unadvertised "encore" in the demo... it was also
played
and sung by Bell Labs' IBM 7094 in 1961 (not to mention HAL). See
http://www.vortex.com/av.html#DAISY
_Hackers_ gives the date as 1957 but that seems to be wrong (unless Bell
Labs did the music separately from the singing).
-- Derek
If I remember
correctly, there was a machine code program
printed once to play "music" with a ZX80 using this method!
Older. Dr. Dobb's Journal, Issue #2... 8080 code, played
Daisy and something else, modulating the S-100 INT signal.
8185
days inactive
8197
days old
2 comments
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