Questions tagged [cassette-tape]

For questions about audio cassette tape, as used for computer data storage.

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5
votes
0answers
126 views

PET LOAD command and the < key

I remember reading (probably in some issue of the newsletter of the PET Benelux Exchange (PBE)) about a strange effect during tape loading of a PET program. Back in the day, I tried it and it worked. ...
8
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2answers
2k views

What should be the waveform for ZX Spectrum tapes?

I am digitizing about 40 tapes with programs for the ZX Spectrum. I am somewhat puzzled by the waveform after digitization. The signal of most cassettes is meander-shaped. One of the cassettes can ...
16
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2answers
2k views

How to decode an audio file which contains an MSX BASIC program? [closed]

I have an audio file in WAV format, which supposedly comes from a cassette sound file. Moreover, it contains a BASIC program, but I don't know how to decode it. I have tried to convert the wav file to ...
4
votes
1answer
178 views

Exact tape recording format for SVI-318/328 computers

I'm looking for the exact tape data format of old SVI-318/328 computers, some kind of whitepapers explaining it. I've obtained several information from a real tape, but I don't known if the infered ...
4
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4answers
261 views

Are there standard DIN pinouts for cassette and video ports on early Japanese 8-bit computers?

I have several different Japanese 8-bit computers, and they use similar DIN connectors for video and cassette I/O: Composite video: 180° 5-pin DIN: Fujitsu FM-7, NEC PC-8001mkII Color TTL (digital) ...
14
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6answers
1k views

How much data could a home computer store on an audio cassette?

The use of audio cassettes for storing data for home computers was a great example of repurposing an existing invention. Cassettes were sold in a variety of capacities, and labelled with their audio ...
6
votes
1answer
465 views

How did the C64 interface tape drives?

How did the C64 interface tape drives? I'm aware that the external interface was basically a audio input - but how was this audio converted into digital data, and how was it loaded into RAM and ...
3
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2answers
762 views

When and why did tape recorders acquire a “remote” input?

This entirely-typical-of-the-era (other than mysteriously missing its EAR socket) tape recorder from 1984 was the "standard" type of tape deck for home computer data storage in the UK. They could be ...
12
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2answers
1k views

Cassette tape storage formats

I just came across this excellent article on cassette tape storage formats. One thing confuses me though... in the "all digital" examples, like Figure 1C, what exactly ends up on the tape? That is, ...
3
votes
2answers
327 views

How significant/pioneering was the TV Typewriter?

How significant and pioneering was the TV Typewriter, in light of things like calculators with CRT's from 1964 and various other things? I recently read that the TV Typewriter established the standard ...
10
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6answers
1k views

Copying tapes “back in the day”

Back when I had a ZX Spectrum 48K, I had a friend that had a 128K and we would swap games for the weekend from time to time. We did try and make duplicates of the tapes (yes, I know, but we were ten ...
4
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4answers
421 views

Cassettes that used stereo?

One of the tricks many of the early machines allowed was the ability to record an audio track on one of the tape channels, and then turn it on or off using the deck control. I believe the Ataris may ...
6
votes
1answer
249 views

What's the difference between Kansas City tape standard and CUTS?

A number of a different computer systems use a tape encoding based on either the Kansas City or CUTS standards. There's a very brief overview on Wikipedia, but it's not clear what the difference ...
13
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2answers
461 views

Using a modern PC or other digital audio recording device as a cassette recorder replacement

I'm having a hell of a time getting this to work. I've got a Casio fx-720p + FA-3 cassette interface, a TRS-80 PC-3 with its cassette interface and printer dock, and a Tandy 102 with a cassette cable. ...
12
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7answers
1k views

Developing an application in the era of cassette tapes (audio-tapes)

My colleague and I have just had a conversation and we were wondering how the process of developing an application was done in the era of cassette tapes. Today we have HDDs, backup HDDs, FTPs, ...
8
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3answers
2k views

Daisy-chained cassette drive?

Early microcomputers sometimes supported several peripherals in a 'daisy chained' arrangement, i.e. instead of the computer having several ports, one per peripheral, it had a single port, which each ...
4
votes
1answer
314 views

Use of PSK for storage of data on audio tape

Most home computers of the 70s and early 80s were able to save and load data on audio cassettes. Typically, in order to do this they encoded the data using frequency shift keying (FSK), i.e. for a '1'...
5
votes
7answers
678 views

CP/M without floppy drive

I remember reading (at the time when it was current) in a hobbyist magazine about a ZX Spectrum modification to map RAM into ROM (not unusual), and implementing CP/M for it. The author ended the ...
1
vote
3answers
501 views

Using VHS/MiniDV/CompactCassette as digital data storage? [closed]

How can VHS cassettes. MiniDV cassettes. Compact audio cassettes be used as digital data storage? Can the error correction strength be adjusted?
7
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4answers
872 views

Overclocking an 8-bit computer

I've been thinking about the possibility of overclocking 8-bit computers of the late seventies and early eighties, and it seems to me that the things most likely to break, would be: Cassette save and ...
24
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2answers
2k views

Why does waggling the joystick of a C64 cause errors loading from tape?

When loading a game from the tape drive on a C64, if you wiggle the joystick around too much the program will not load correctly. Is there an explanation for this? EDIT: Perhaps someone can try to ...
13
votes
1answer
814 views

Early Apple assemblers, getting hold of them

The apple ][ history site https://apple2history.org/history/ah17/#05 has a section on assemblers with these interesting snippets: TED/ASM: Developed at Apple and smuggled out the doors around May ...
10
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2answers
277 views

What format was used for Exidy Sorcerer cassette tapes?

The Exidy Sorcerer personal computer could use audio cassette tapes for program storage. In what format were programs (and data?) stored on tape? What was the data rate? I seem to remember the tape ...
20
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2answers
2k views

Blue and yellow stripes on the screen when loading from tape on ZX Spectrum

When loading a program from tape on ZX Spectrum you could see those blue and yellow stripes around the splash screen. I might be mistaken but I believe those were even sometimes used for quite ...
7
votes
1answer
1k views

What is the maximum BAUD rate for ZX Spectrum tapes?

I've played with various BAUD rate programs that allow you to save most of the RAM into a cassette tape up to around 9600 BAUD. Has anyone written or have a way to write the ram to tape (not ...
11
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3answers
1k views

Why did the ZX Spectrum use edges for its tape storage routines?

Why did the Sinclair ZX-Spectrum use edges for its standard tape storage routines? I can see that frequency modulation was likely necessary in order to account for the inaccurate timings when running ...
21
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3answers
2k views

Why did the Atari 8-bit computers make beeping noises while accessing the disk and cassette drives?

If you've ever used an actual Atari 8-bit computer with either a cassette or disk drive, you would have noticed that it made a variety of "beeping" noises while accessing the devices. Specifically, ...
29
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2answers
1k views

Rescuing data from old audio cassettes

In my recent expeditions to the darkest corners of my garage, I've found a load (there's a pun in there somewhere) of old audio tapes containing Sinclair Spectrum code. These aren't commercial titles, ...
4
votes
2answers
75 views

Memac Obj files for running and making Tape Format

We are using MEMAC system and this device is using 30 years old Tape Casettes. The company non-exist anymore but they sent me 8" floppy disks so I can have chance to retrieve the files inside and make ...
10
votes
1answer
500 views

Why CPC464 display is less stable while reading from cassette?

Context The Amstrad CPC 464 has a very stable RGB video output. By "stable" I mean that the image on the CRT monitor does not move, wiggle, shake in any way. The electron beam draws every pixel ...
8
votes
2answers
1k views

Is it possible to use a TI-99/4A cassette cable with Digital Audio devices?

I would like to save and load BASIC programs with my TI-99/4A. The TI-99/4A can be connected to a cassette recorder for this purpose. Buying a cassette recorder and cassette tapes seems unnecessary ...
8
votes
1answer
315 views

Is there any existing hardware mod for C64 to decouple tape drive from IEC (1581 drive collision)?

Commodore 64 has a known bug which doesn't allow to use tape drive together with a 1581 drive. Basically, in C64 the SRQ (Serial ReQuest) line is connected between IEC bus, CIA chip and the tape ...
35
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3answers
15k views

Loading ZX Spectrum tape audio in a post-cassette world

My ZX Spectrum 48k seems very resistant to working with audio input. I no longer have any cassette players, so am relying on audio files from digital players. I have been able to save and verify a ...
4
votes
1answer
212 views

Magnetic tape data preservation format

What 'virtual tape' image format is most suited for data preservation i.e. can store metadata like density and media type of original tape, presence of data past EOT marker, parity/ECC bits etc.?
12
votes
1answer
450 views

How to use virtual cassettes with Matthew Reed's TRS-80 Model III emulator? (TRS32)

I'm fooling around with Matthew Reed's TRS-80 Model 1/III/4 emulator for Windows (TRS32) and am have trouble using virtual cassettes. I am using it to emulate a Model III with Level II BASIC. I have ...
14
votes
6answers
570 views

Did any microcomputers back in the day accellerate standard-cassette performance

Many commonplace cassette recorders in the 1970s and 1980s were capable of reading or writing two tracks at once (stereo). While that wasn't universal (portable cassette recorders were often monaural,...
12
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3answers
1k views

How did Atari cassette “turbo without hardware mods” work?

There were some cassette copying programs for 8-bit Atari, that boasted saving the games in a way that would load it at up to 1800baud - versus the standard 600baud, which was a significant ...
11
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1answer
391 views

What format is used for CoCo cassette tapes?

Color Computer machines initially used audio cassette tapes for storage. How was the data stored? What was the maximum bit rate?
8
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2answers
1k views

What format is used for Apple II cassette tapes?

Apple II computers initially used audio cassette tapes for storage. How was the data stored? What was the maximum bit rate?
10
votes
1answer
163 views

What to replace the belt in the cassette drive of an Epson HX-20 with?

I am the owner of an Epson HX-20 laptop computer. It runs well except for the builtin cassette drive which doesn't seem to work reliably. After carefully disassembling it I found that the belt seems ...