Search found 372 matches

by tcat
Sun Apr 23, 2017 11:04 am
Forum: Hardware
Topic: Random hardware ideas!
Replies: 24
Views: 854

Re: Random hardware ideas!

Hi,

3D printed QL-matching case


Could this be external MD drive with QL case similar looks?

I we had more drives, could we also somehow reengineer cartridges. Can cartridges be respooled with VHS video tape?

Tomas
by tcat
Sat Apr 22, 2017 4:43 pm
Forum: Hardware
Topic: Using ZX Microdrives on the QL
Replies: 52
Views: 2024

Re: Using ZX Microdrives on the QL

Hi Timbuctus, I am only a hobbyist, my tools do not match advanced skills of people here. I set myself on a QL and MD learning quest a while ago. MD unit is so simple device one may wonder why it is ill-reputed at all. I tinker with ZX as well, I have a single MD drive though. I also got involved in...
by tcat
Fri Apr 21, 2017 11:13 am
Forum: Hardware
Topic: Using ZX Microdrives on the QL
Replies: 52
Views: 2024

Re: Using ZX Microdrives on the QL

Hi, I have wished to know, what was the mass market 80's audio tape device, that used same combo r/w/e head as Sinclair also sourced for their MD units? Was it a walkman, car radiotape? What make? I can imagine the production must have gone in ten of thousands quantities. Any trace of it in UK, post...
by tcat
Thu Apr 20, 2017 8:37 pm
Forum: Hardware
Topic: Using ZX Microdrives on the QL
Replies: 52
Views: 2024

Re: Using ZX Microdrives on the QL

Well, they look like electrolytic capacitors to me. Small roundish black plastic case.
Circled in red, please see picture here.
viewtopic.php?f=2&t=1381&p=15749#p15749

Tomas
by tcat
Thu Apr 20, 2017 8:28 pm
Forum: Hardware
Topic: Using ZX Microdrives on the QL
Replies: 52
Views: 2024

Re: Using ZX Microdrives on the QL

Hi,

Perhaps slightly off topic, QL MD's have two elyts of very small dimension compared to ZX MD's.
What would be drop-in replacement to them in QL, they seem very solid makes, unlike in ZX MD's, if it makes sense to replace them after years?

Tomas
by tcat
Thu Apr 20, 2017 7:34 pm
Forum: Hardware
Topic: Using ZX Microdrives on the QL
Replies: 52
Views: 2024

Re: Using ZX Microdrives on the QL

Dave, Yes, now I believe so, too. MD unit is very simple device, with only few components, compared to 80's taperecorder, must have been for a fraction of the cost. `tape lube' caught my attention, what sort of liquid lubricant was used, I guess to minimise tape wear, also to prevent from jamming in...
by tcat
Thu Apr 20, 2017 9:53 am
Forum: Hardware
Topic: Using ZX Microdrives on the QL
Replies: 52
Views: 2024

Re: Using ZX Microdrives on the QL

Hi Charlers, This lead to the question of why the choice of values for R4/R5 on the ZX Microdrive. Out of all the combinations I tried the only one that failed on the QL was the very one which was chosen for the ZX. Why would that be? Be great if someone could confirm what I’ve found. Could it have ...
by tcat
Thu Apr 20, 2017 9:37 am
Forum: Hardware
Topic: Using ZX Microdrives on the QL
Replies: 52
Views: 2024

Re: Using ZX Microdrives on the QL

Hi Timbucus,

The drive still does not format on ZX?
You mentioned some elyts and polystyrene caps replacement, r/w head seems alright.

How can ULA influence formatting, as I always though it as two channel operational amplifier and signal FM merger for reading `0' and `1' from two tracks.

Tomas
by tcat
Wed Apr 19, 2017 7:00 pm
Forum: Hardware
Topic: Using ZX Microdrives on the QL
Replies: 52
Views: 2024

Re: Using ZX Microdrives on the QL

Hi Timbucus, The erase coil gives good readings in my opinion (so do r/w coils), so this should not affect format r/w performance, I should think. Ratchet tensioner caught my attention, amazing, I only heard about them, is it a piece of metal spring clutching against the rubber roller, to slow it do...
by tcat
Wed Apr 19, 2017 9:02 am
Forum: Hardware
Topic: Using ZX Microdrives on the QL
Replies: 52
Views: 2024

Re: Using ZX Microdrives on the QL

Hi Timbuctus,

I am just curious.
Can you measure resistance on upper / lower / erase coils of the R/W head of the third drive 04-083529?

Tomas

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