Cassette Interface Prototype testing underway

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Last seen: 5 years 3 months ago
Joined: Dec 20 2003 - 10:38
Cassette Interface Prototype testing underway

I've finally had time to work on the cassette interface for the replica 1 and I have the prototype working. I'm doing another prototype run this week because the prototype board I have now was with my old board mfg company. I decided to go with a 90% look-alike but I made one noticable change with the PROM's. I'm going to use the 28C64 in place of the 2 PROM's because of the availability of the EEPROM's vs. PROMs and a few other reasons. I also added decoupling capacitors to all the IC's to help reduce noise. Other things I've done was to label the IC's and resistors and the capacitor.

As with everything I develop for the replica 1, the cassette interface is apple 1 compatible and will have the standard .156" slot edge to work with the Apple 1 or clone computers with .156" slots. For the replica 1, the expansion interface board will be required.

First test is with replica 1 SE and replica 1 rev B. Both machines work quite well using TRS-80 CC81 tape drive and a "everyday use" tape.

I'm using 3.5mm stereo cables and they work great. The replica 1 is equiped withe the new Slot Expansion interface board with a 6" IDE cable between the expansion board and the replica 1.

I have been able to store and reload every program so far with the cassette interface without any problems. The reliability far exceeds what I had wished for.

Phase 2 will involve recording to my laptop and reloading using wav file player. If this works good, I'll convert to MP3 and see if there is any hope it will work with compression. We will see.

Final Phase will be trying the cassette interface with PDA (sorry, no ipod) for a small footprint format. Here is a photo of the layout of the board in pdf format for viewing. I'll have real pics next week.

brielcomputers.com/files/cassetteproto.pdf

Cheers,

Vince

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Last seen: 10 years 10 months ago
Joined: Mar 9 2005 - 03:00
No iPod? Do you mean you wil

No iPod? Do you mean you will put the MP3s on the PDA?

Are there any good/cheap mp3 player/recorders out there?

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Last seen: 5 years 3 months ago
Joined: Dec 20 2003 - 10:38
Well, the problem with using

Well, the problem with using a PC or PDA is that they don't have powered outputs. In other words, they can power headphones just fine but the output needs to be powered like on the old cassette interface. These work because you can change the output volume. Actually, the setting on my tape recorder isn't that loud but yet it is much louder than the output can go on a PC. Therefore, you can't go straight from a PC or PDA to the cassette interface.

(no ipod) meant that I don't have an ipod to work with. There has to be some other means to record and playback other than the cassette interface.

Vince

FunnymanSE30's picture
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Last seen: 6 years 1 month ago
Joined: Aug 22 2005 - 10:32
My apple //e platinum is able

My apple //e platinum is able to load information from casset audio files from my iMac g3 or powerbook g3.

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Last seen: 8 years 7 months ago
Joined: Oct 28 2006 - 14:24
How about Audacity (audio edi

How about Audacity (audio editor- multi-platform) to record/playback.

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Joined: Dec 20 2003 - 10:38
It's not the software that's

It's not the software that's the problem, it is the amplification of the computer. Older PC's with Soundblaster 16 sound cards in them had built in amplifiers, but now things have changed and there is no amps built in, you must use powered speakers on computers. Laptops may be different but I don't think so.

Here's a picture of the prototype cassette interface:

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