Search found 128 matches

by Erm
Sun Mar 01, 2020 11:02 am
Forum: Hardware
Topic: Homemade 64K RAM pack
Replies: 7
Views: 3678

Re: Homemade 64K RAM pack

Since it has a Sinclair prom: maybe that is a prototype, made by the Sinclair developers, which never lead to a product? Siggi It certainly is an amazing bit of kit. Externally is also nicely done. Simple and stylish, and it's length fits perfectly behind the whole width of the ZX81. It was just a ...
by Erm
Wed Feb 26, 2020 1:01 pm
Forum: Welcome Area
Topic: Hello from the UK!
Replies: 4
Views: 1580

Re: Hello from the UK!

That's a very good point actually, I should have given it more thought. I'll get my coat.
by Erm
Tue Feb 25, 2020 6:08 pm
Forum: Hardware
Topic: Homemade 64K RAM pack
Replies: 7
Views: 3678

Homemade 64K RAM pack

This is the inside of a rather attractive homemade 64k Memory pack that I got recently. Whoever made it, was a very skilled person and seemed to have stock of some late 1970s chips when they made it. As you can see, it consists of 8x Mostek RAM chips, 7x 74X logic chips and an 82S123N PROM, which ha...
by Erm
Tue Feb 25, 2020 5:52 pm
Forum: GAMES
Topic: Super Star Trek
Replies: 23
Views: 7827

Re: Super Star Trek

A couple of those screens remind me of the German Star Trek theme game 'Enterprise' which was published by ISS (the exclusive German Sinclair Importer) and was by Kilian Schlaich. I am actually in contact with him from time to time. I have permission to share it, so here it is as a .p file (for the ...
by Erm
Tue Feb 25, 2020 5:43 pm
Forum: Welcome Area
Topic: Hello from the UK!
Replies: 4
Views: 1580

Re: Hello from the UK!

Loving the keyboard stuck-on add-on. And also, may I say, without wanting to sound like some kind of stereotypical computer geek that doesn't get out much (although I think that is probably unavoidable): what lovely hands you have for a lady who must surely be in about the same age bracket as other ...
by Erm
Tue Feb 25, 2020 5:32 pm
Forum: Sinclair Misc
Topic: Saved programs too noisy
Replies: 13
Views: 4241

Re: Saved programs too noisy

Try saving the prog to a PC/laptop running Audacity set to record, then see if the result shows the usual peaks of a program and whatever else (you may have to enlarge the screen). It can be a bit fiddly as most laptops have a dual mic/headphone socket and won't like the mono ZX81 jack. My ASUS netb...
by Erm
Fri Feb 21, 2020 1:20 pm
Forum: ZX Spectrum Lounge
Topic: Working Games Cartridge MDR Image (from the IF1 pack)
Replies: 0
Views: 3159

Working Games Cartridge MDR Image (from the IF1 pack)

Hello, I'm restoring the Microdrive cartridges that came with the Interface 1 expansion pack, namely: 'Introduction', 'Business' and 'Games'. I'm using my vDrive to write the good mdr images onto the original real (and formatted/checked etc) cartridges. It's fiddly, but I'm making progress! I've stu...
by Erm
Thu Feb 06, 2020 9:01 pm
Forum: ZX Spectrum Lounge
Topic: Source of 200ohm speakers?
Replies: 11
Views: 2744

Re: Source of 200ohm speakers?

I'll bear that in mind, thanks. I've sorted it with the extra transistor and a 40ohm speaker on this occasion.
by Erm
Wed Feb 05, 2020 9:57 pm
Forum: ZX Spectrum Lounge
Topic: Source of 200ohm speakers?
Replies: 11
Views: 2744

Re: Source of 200ohm speakers?

Sorted. Half neatly done - but it doesn't matter as it's hidden by the heat sink. I stole a TR7 from a parts only Issue 6 board.

Thanks Mark and Xav for your comments.
by Erm
Wed Feb 05, 2020 9:14 pm
Forum: ZX Spectrum Lounge
Topic: Source of 200ohm speakers?
Replies: 11
Views: 2744

Re: Source of 200ohm speakers?

1024MAK wrote:
Wed Feb 05, 2020 9:01 pm
Changing to the later circuit just involves removing diode D10 and replacing it with a transistor and some patch wires.
Oh yes, so it does! I only need to pinch the 9v from somewhere. I'll give that a go then.