Commodore Computers
What happens if someone plays a commodore/old computer tape in a regular cassette player?
I've always been curious about this one, though I don't own ay old computers. Back before hard drives they used actual cassette tapes. What would of happened if someone placed one of these in an actual cassette player? Would you hear noises or any weird sounds?
You will hear something that sounds like bursts of white noise. Actually, what you hear as audio, noise, is actually a finely modulated audio signal. The reason why is sounds like white noise is because of your ears. You are used to hearing amplitude modulation, which is what your voice is. What is on the tape is Phase Shift Keying, (PSK) which is a way of shifting the phase of a pure tone to represent digital data, 1's and 0's. This is very similar to what a telephone modem does when it comes to rates faster than 2400 baud. 2400 and below was tone shifting, called Frequency Shift Keying (FSK), switching between pairs of tones indicated the change of data from 0 to 1 and back to 0 again. 2400 and above is phase shift keying. One pair of tones was incoming data, with a 2nd pair being outgoing, which gave you a full duplex link. You realize that MODEM is actually an acronym for MOdulatior/DEModulator, right? The device modulates the outgoing signal and demodulates the incoming signal, digital to analog and analog to digital. In essence, it is a way to transfer data faster over the same audio frequencies that can be carried by a standard telephone wire or recorded on tape. If you have ever picked up a telephone extension on a line where a modem was in use, you would hear the exact same type of noise, actual tones if FSK, white noise like if PSK. DSL lines have filters that block the signals used by the DSL portion sounds from getting to your handset. Use the phone without the filter and you will hear the DSL signals. By the way, I have one of those old computers, that I built from a kit back in 1976, which is still in service today as a dedicated controller for the dampers and fans on my wood stove. The tape subsystem uses what was then called the Kansas City Standard.
Check out these deals on Commodore Computers-related items and save!
 FM2 EXPANSION KIT for COMMODORE 64 CBM COMPUTER on DISK US $2.37 
|
 Computer's First Book Of Commodore 64 Games US $24.99
|
 M501 ram expansion (512K) for Commodore Amiga A500 computer US $10.00
|
 Commodore 64 computer and box US $100.00
|
 Very nice keyboard for Commodore SX-64 computer US $56.00
|
 Commodore plus/4 computer for parts or repair US $14.27
|
 NIB vintage COMMODORE 64 computer POWER SUPPLY - BRAND NEW mint MIB - never used US $49.77
|
 SERVICE MANUAL Commodore 16 Model C16 Computer Prelim. US $34.95
|
 Commodore Vic 20 Computer in Box US $65.00
|
 Practical Interfacing Projects with the Commodore Computers US $69.99
|
 Commodore 64 vintage computer T shirt - All Size US $14.99
|
 ****COLLECTORS*** COMMODORE 128D COMPUTER WITH KEYBOARD US $350.00
|
 Commodore Computer Power Supply Unit US $7.89
|
 Commodore 128 computer - cleaned, tested, working w/new power supply US $120.00
|
 V - THE COMPUTER GAME - commodore 64 game - c64 US $6.31
|
 Vintage Commodore Plus/4 Computer with Original Box, software, Manuals, Power US $11.50
|
 Commodore 64C Personal Computer System US $16.50
|
 Commodore 64 computer system with extras US $19.99
|
 MINT COMMODORE 64 COMPUTER US $75.00
|
 Vintage Computer Collector Guide 1971-1993 incl Tandy NEC Commodore Apple Others US $29.95
|
 Vintage Commodore 64 Computer 1702 Monitor ~(S1754)~ US $49.99
|
 Commodore 64 Computer cpu US $50.00
|
 Brand new keyboard for Commodore C-16 computer US $10.00
|
 VINTAGE WORKING CBM COMMODORE 8032 COMPUTER SYSTEM - NICE! US $199.99
|
 COMMODORE 64 HOME COMPUTER 1982 NEW 7 Pinback Buttons US $5.39
|
 Vintage Commodore 64 C64 Computer does not Power On US $19.99
|
 #201 Vintage Computer Game Jingle Disk Atari Commodore US $.99
|
 Commodore 64 Computer - AS IS - Untested - Good Condition US $30.00
|
 vintage Commodore VIC-20 computer base unit, ex. shape, with cord. US $49.90
|
 Commodore 128 Personal Computer ASIS US $29.99
|
 Mint condition original Commodore schematics for SX-64 portable computer US $22.29
|
 Commodore 64 Computer - Boxed US $158.07
|
 Commodore 64 Vintage Computer Lot US $9.99
|
 Commodore 64 , Parts and Games lot lots of games and 2 computers US $75.00
|
 VINTAGE LUCASARTS PIPE DREAM COMMODORE 64 COMPUTER GAME US $29.95
|
 Easy Script 64 Commodore 64 Computer US $1.57
|
 Model 1541 Test/Demo Diskette Commodore 64 Computer US $1.74
|
 Commodore Computer 1701 1702 monitor Service Manual US $34.95
|
 Commodore "Personal Computing On The VIC-20" Computer Guide. US $9.95
|
 Vintage Commodore 64 Personal Computer US $99.99
|
 VINTAGE COMMODORE 64 COMPUTER Included Power Supply and video cord US $80.00
|
 Commodore 64 in box Vintage computer US $2.25
|
 VINTAGE--COMMODORE--COMPUTER TELEPHONE MODEM 300 US $8.79
|
 COMMODORE 128 PERSONAL COMPUTER! US $72.99
|
 LOT of 3 VINTAGE BASIC PROGRAMMING COMPUTER BOOKS, were used with Commodore 64 US $9.99
|
Commodore 64 - 25th Anniversary Celebration
Recently found via this site:
No comments yet.
Leave a comment
No trackbacks yet.