Search found 20 matches

by jonriglar
15 Aug 2015 22:03
Forum: HARDWARE
Topic: Another MTX Fault - Jon Riglar's MTX
Replies: 29
Views: 28444

Re: Another MTX Fault - Jon Riglar's MTX

Hi Mark The board appears to have 3 ROMs in sockets. It has 4000-06 printed topside. There are no link wires soldered on the underside. I've checked the main voltages and they are present. I have a multimeter, soldering kit, even one of those usb powered small digital storage scopes, but that only s...
by jonriglar
15 Aug 2015 16:35
Forum: HARDWARE
Topic: Another MTX Fault - Jon Riglar's MTX
Replies: 29
Views: 28444

Re: New member saying hello

Hi Dave I'll take you up on the memory offer; my email is jonriglar@outlook.com if you want to send me a Paypal invoice direct? Thanks Jon Ooops - the "aha moment" is all mine :-) I have 4116 and 4164 for sale, I confused which ones you had bought. The 4116 are good for the VRAM The 4164 a...
by jonriglar
14 Aug 2015 23:40
Forum: HARDWARE
Topic: Another MTX Fault - Jon Riglar's MTX
Replies: 29
Views: 28444

Re: New member saying hello

No that's an interesting question!
I bought 4116 chips - which is what was/is fitted as VRAM on my board (x8).
Is there a 'aha' moment coming? (Something fundamental I've got wrong!?)
by jonriglar
14 Aug 2015 23:36
Forum: HARDWARE
Topic: Another MTX Fault - Jon Riglar's MTX
Replies: 29
Views: 28444

Re: New member saying hello

Hi Dave
We are one and the same - only my mother still calls me Jonathan lol!
Jon
by jonriglar
14 Aug 2015 23:25
Forum: HARDWARE
Topic: Another MTX Fault - Jon Riglar's MTX
Replies: 29
Views: 28444

Re: New member saying hello

Hi Dave
Happy with a soldering iron, so would be ok swapping out old for new chips - and into sockets.
Do you stock suitable chips?
Thanks
Jon
PS I realise this probably shouldn't be in the Introductions thread!
by jonriglar
14 Aug 2015 22:40
Forum: HARDWARE
Topic: Another MTX Fault - Jon Riglar's MTX
Replies: 29
Views: 28444

Re: New member saying hello

Hi Dave
I haven't changed the main RAM. It's definitely a 64K set up. Following your advice I've checked continuity on the main RAM chips and all is fine.
I've only changed the VRAM chips.
Regards
Jon
by jonriglar
14 Aug 2015 16:43
Forum: HARDWARE
Topic: Another MTX Fault - Jon Riglar's MTX
Replies: 29
Views: 28444

Re: New member saying hello

Serial Numbers is 512/25525
I seem to have suddenly found a constant 'tone', but pressing CTRL + G makes no difference; probably because the tone is already constant?!
by jonriglar
14 Aug 2015 14:41
Forum: HARDWARE
Topic: Another MTX Fault - Jon Riglar's MTX
Replies: 29
Views: 28444

Re: New member saying hello

Hi Dave A quick look at the webpage link and my advert/machine isn't listed there. I'll dig out more info (serial number, etc.) later. I didn't pay too much for the machine, and was aware there was likely to be some TLC required. I understood it was listed as 'for spares', so no complaint there. My ...
by jonriglar
14 Aug 2015 13:33
Forum: INTRODUCE YOURSELF
Topic: New member saying hello
Replies: 4
Views: 8870

Re: New member saying hello

Hi Dave I'll get the serial number later and post it. The unit is in excellent cosmetic order but it was obvious once open that it had some 'history' that was different from that described in the advert on EBAY. Several of the VRAM chips had been replaced and all were running uncomfortably hot. I've...
by jonriglar
14 Aug 2015 11:41
Forum: INTRODUCE YOURSELF
Topic: New member saying hello
Replies: 4
Views: 8870

New member saying hello

Hi all, Quick introduction as I signed up today. I'm a collector of most 8 bit machines, and even some early 16 bit. Recently added a pristine MTX 512 to my collection only to find it doesn't work! The wonderful experience of Ebay - never mind, interesting project now to repair. The MTX is a compute...