Search found 464 matches

by Martin A
30 Aug 2020 21:46
Forum: NEW HARDWARE
Topic: NFX Hardware description
Replies: 5
Views: 512

Re: NFX Hardware description

Looks pretty good to me.

The Wiz module has the pins labelled underneath, slightly blury photo attached for confirmation.
pins.jpg
pins.jpg (44.83 KiB) Viewed 484 times
by Martin A
29 Aug 2020 20:37
Forum: NEW HARDWARE
Topic: Memotech Network File Transfer
Replies: 15
Views: 756

Re: Memotech Network File Transfer

I had a quick play with the revised code at Dave's request, I was using the default settings.

Seing the file list come up was impressive.

Transfering longer files turned out to be a problems ans invariably NFX.COM locked up with a memory error.
I think I broke it
I think I broke it
oom.jpg (86.92 KiB) Viewed 276 times
by Martin A
29 Aug 2020 19:06
Forum: NEW HARDWARE
Topic: NFX Hardware description
Replies: 5
Views: 512

NFX Hardware description

The first NFX used a WIZ811MJ network module, which used a W5100 self contained TCP/IP controller. The updated version uses the newer WIZ810SMJ, which has the W5100S fitted. http://shop.wiznet.eu/modules/io-modules/wiz810smj.html The new module is half the price of the old one (typically around a te...
by Martin A
15 Aug 2020 22:39
Forum: MEMOFEST 2020
Topic: Any Memofest this year?
Replies: 4
Views: 965

Re: Any Memofest this year?

I got this "timeline" from the .gov.uk site 1.2 What else will change in the next few months? In the Prime Minister’s update on progress on 17 July, he set out the next stages of our roadmap. From 1 September: schools, nurseries and colleges will open for all children and young people on a full-time...
by Martin A
13 Aug 2020 11:52
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 13060

Re: MTX 512 (debugging thread)

I probed the leg of the VDP crystal (using x10 probes and pin 16 if J7 for ground) and got the following waveform. Ads00018.jpg The scope didn't get a lock on frequency, but from the scale, you can see it's OK. So your 0v flat line does look very suspect! Interesting asside the 10.6875mhz crystal on...
by Martin A
28 Jul 2020 19:02
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 13060

Re: MTX 512 (debugging thread)

Just for reference, those rams are 150ns, not 15. Back in the 80s, 15ns ram was the sort of stuff you'd find in a Cray mainframe. :o

When the MTX was built, 200ns for the rams would have been normal, so 150ns is faster than required definitely not too slow.
by Martin A
20 Jul 2020 19:33
Forum: HARDWARE
Topic: No picture.
Replies: 92
Views: 8729

Re: No picture.

I can see from the photo that there'sa 32k ram board in there. To might find the main board easier to move if you take the extra ram out first.
by Martin A
25 Jun 2020 19:55
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 64
Views: 16354

Re: Another Home-Brew - Z180

It's a great feeling when that happens. Well Done :D I've checked the Z180 board I did for the MTX plus, that's got a 12mhz clock on it so I suspect I ran that clock doulbed. It's a long time since I played with it, though I do remember trying all sorts of clocks, I think it was more stable at 12 do...
by Martin A
20 Jun 2020 13:49
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 64
Views: 16354

Re: Another Home-Brew - Z180

Bill B wrote: 20 Jun 2020 11:21
Martin A wrote: 19 Jun 2020 22:09 Sheesh that's a lot of work to get the CPLS programmed!
Since the whole project is just a pass-time anyway, what does it matter :roll:

Besides, I learn stuff along the way.
And the learning is the important thing really.
by Martin A
19 Jun 2020 22:09
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 64
Views: 16354

Re: Another Home-Brew - Z180

Sheesh that's a lot of work to get the CPLS programmed!

But it's done now :D