Search found 130 matches

by TMAOne
Wed Jun 27, 2018 8:01 am
Forum: Hardware
Topic: ZX80/81 & TS1000/1500 modern upgrades
Replies: 11
Views: 384

Re: ZX80/81 & TS1000/1500 modern upgrades

My personal vote would go to the ZX-TEAM mod for 16 or 32K on the ZX81 motherboard. http://www.zx81.de/english/_frame_e.htm Everybody knows those wobbly, inept, high failure-rate 16K RAM packs are a royal pain. The "Hardware Projects" section on the ZX-TEAM site lists this mod first and foremost. It...
by TMAOne
Tue Jun 19, 2018 6:26 pm
Forum: Hardware
Topic: Improving Timex/Sinclair Tape Loading
Replies: 134
Views: 9679

Re: Improving Timex/Sinclair Tape Loading

It's been a while. Is there any movement on this?
by TMAOne
Thu May 17, 2018 9:13 pm
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 198
Views: 20562

Re: ZX81 ULA-in-a-CPLD

Congratulations Andy!

This is truly a milestone in Zeddy history, as I know many otherwise good examples have gone to the dumpster for lack of a replacement ULA.

Good going. I look forward to them being widely available.
by TMAOne
Tue Feb 13, 2018 11:54 pm
Forum: Hardware
Topic: Composite to HDMI Converter
Replies: 11
Views: 1269

Re: Composite to HDMI Converter

eBay is full of ones like this from China. AVtoHDMI (600 x 600).jpg Some folks avoid the Chinese stuff like the plague, but for the price it's hard to go wrong. I use one with my Texas Instruments TI-99/4A, which is rather demanding--the "composite" video is taken from a cable that was meant to feed...
by TMAOne
Sun Feb 11, 2018 4:33 am
Forum: Hardware
Topic: Improving Timex/Sinclair Tape Loading
Replies: 134
Views: 9679

Re: Improving Timex/Sinclair Tape Loading

I never make mistakes. Once I thought I'd made a mistake, but it turned out I was wrong. :P

Seriously though, I'm glad to hear another dubber is on-line. Can't wait for Lardo to turn it loose on those "unrecoverable" tapes and see how many can be rescued.
by TMAOne
Sat Feb 03, 2018 12:01 pm
Forum: Hardware
Topic: Lambda 16 memory expansion and ROM question
Replies: 2
Views: 476

Re: Lambda 16 memory expansion and ROM question

mrtinb wrote:
Thu Feb 01, 2018 10:11 am
A regular ZX81 16K RAMpack should work with Lambda 8300.
I concur. My Lambda, (insipidly named "Your Computer"), uses a Timex 1016 RAM pack I have left over after doing the 32K mod to my ZX81. It works just fine.
03 (600 x 450).jpg
03 (600 x 450).jpg (62.11 KiB) Viewed 439 times
by TMAOne
Wed Jan 24, 2018 12:51 am
Forum: Hardware
Topic: Direction of current flow
Replies: 15
Views: 955

Re: Direction of current flow

My brain hurts.
by TMAOne
Tue Jan 23, 2018 12:20 pm
Forum: Hardware
Topic: Direction of current flow
Replies: 15
Views: 955

Re: Direction of current flow

Mostly people mean the technical direction when talking about current flow which is more historical or conventional but not very precise. I wonder if it's a cultural thing which depends on which side of The Pond you're on. I was taught to think of current in terms of the flow of electrons, moving f...
by TMAOne
Sun Jan 07, 2018 8:02 pm
Forum: Hardware
Topic: Improving Timex/Sinclair Tape Loading
Replies: 134
Views: 9679

Re: Improving Timex/Sinclair Tape Loading

That's a nice looking board you're working on Lardo--much better than my cobbled together effort. I'm excited for you. You've answered most of your own questions. Refer to the circuit diagram for the rest, as "top" is somewhat arbitrary. The stripe on the diode goes where the "line" is on the circui...
by TMAOne
Sun Jan 07, 2018 8:02 pm
Forum: Hardware
Topic: Direction of current flow
Replies: 15
Views: 955

Re: Direction of current flow

The stripe on the diode goes where the "line" is on the circuit diagram. (I think of the symbol as depicting an "arrow" hitting a "wall", showing the direction in which current can NOT flow.)

Looks like you're almost there,...
Ian