Search found 693 matches

by Martin A
02 Feb 2014 00:54
Forum: GENERAL DISCUSSIONS
Topic: FREE Electronic Components !!! - no, this isn't spam !
Replies: 54
Views: 49672

Re: FREE Electronic Components !!! - no, this isn't spam !

Colour me interested too.

Some VERY interesting chips in that list.
by Martin A
31 Jan 2014 18:32
Forum: REMEMOrizer
Topic: REMEMOrizer : VGA monitor compatibility
Replies: 14
Views: 25417

Re: REMEMOrizer : VGA monitor compatibility

Rememorizer tested and working fine with the 2 monitors I tried it on: CIBOX 19" Widescreen monitor - model no LW1922C, and Samsung Syncmaster 720N 17" monitor also works fine on a my father's Panasonic Viera 32 Widescreen TV (well he'd not played Hawkwars for 25 years+ so I "tested&q...
by Martin A
31 Jan 2014 14:45
Forum: HARDWARE
Topic: Replacement PSU for MTX512
Replies: 6
Views: 7447

Re: Replacement PSU for MTX512

The Simple answer is that the MTX "PSU" is a multi voltage transformer.

The AC it supplies is converted to DC on the main board.

It needs more than one regulator as the Video ram chips need 12v, 5v and -5v

I expect Dave to pop up shortly with the links to the schematics etc. ....
by Martin A
31 Jan 2014 11:53
Forum: GENERAL DISCUSSIONS
Topic: The forum is NOT read-only!
Replies: 20
Views: 26034

Re: The forum is NOT read-only!

Have you considered using any Dual-Port Static RAM? I did consider dual port ram. A while back, I built a Z80 co-processor to fit in my RiscPC, that uses an IDT7132 2k dual part ram for communications. However, although I've got it running BBC Basic Z80, I can type in program lines and run then, th...
by Martin A
31 Jan 2014 00:33
Forum: GENERAL DISCUSSIONS
Topic: The forum is NOT read-only!
Replies: 20
Views: 26034

Re: The forum is NOT read-only!

Well the smallest capacity ever MTX memory expansion would seem to be working. Up to 16 bytes can be fed into the fifo by writing to an output port, and read back from the same port, in the order they were written. The status port that can be checked to read the status of the empty and full flags ap...
by Martin A
26 Jan 2014 22:37
Forum: GENERAL DISCUSSIONS
Topic: The forum is NOT read-only!
Replies: 20
Views: 26034

Re: The forum is NOT read-only!

Reverse BBC Micro anyone ??? I've had limited success so I didn't really want to say anything, but (big) Dave want forum post so ........ An MTX Tube Interface - great idea . . . And just look at all that extra board space you have to add a Motorola 6845 BBC (and Memotech FDX) CRT controller in add...
by Martin A
26 Jan 2014 20:46
Forum: GENERAL DISCUSSIONS
Topic: The forum is NOT read-only!
Replies: 20
Views: 26034

Re: The forum is NOT read-only!

fifo 1-20 wiring.jpg fifo1-20 top.jpg I've been playing with FiFo's ! The 2, 16 pin chips, are 4 bits by 16 fifo's, that's right folks a 16 byte memory card. A fun occupation, however, if I can get my head around a memory device with no address bus, then I'm told it's the best way to communicate wi...
by Martin A
18 Jan 2014 15:25
Forum: HARDWARE
Topic: Help with repair
Replies: 50
Views: 47168

Re: Help with repair

Retrocosm wrote:I'm powering down after 10 seconds or so as the board starts to smell hot.
Have you tried touching the chips on the board, to see if any are running hot?
by Martin A
12 Jan 2014 10:55
Forum: INTRODUCE YOURSELF
Topic: Inaki
Replies: 4
Views: 7802

Re: Inaki

Welcome
by Martin A
09 Jan 2014 20:59
Forum: HARDWARE
Topic: Embarrassing newbie questions
Replies: 32
Views: 43781

Re: Embarrassing newbie questions

If you're handy with a soldering iron, you could always remove the BNC socket, and fit an RCA one instead