Search found 770 matches

by Dave
11 Jul 2020 11:38
Forum: INTRODUCE YOURSELF
Topic: Greetings
Replies: 3
Views: 33

Re: Greetings

Hi Peter,

As Mark says, “welcome”!

If you are interested in running MEMU on a Raspberry Pi, check out Bill Brendling’s “bare metal” implementation here
http://www.primrosebank.net/computers/m ... EMU_ds.htm

Regards
Dave
by Dave
09 Jul 2020 17:44
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 52
Views: 7832

Re: MTX 512 (debugging thread)

Hi,

the questions aren't stupid, it just helps to know that you have followed earlier advice, including checking for shorts at the locations mentioned

regards
Dave
by Dave
09 Jul 2020 16:17
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 52
Views: 7832

Re: MTX 512 (debugging thread)

It's obviously been a year since you read Mark's post a couple of entries above this post.

Mark gave you some tips there on the -5V question, are you sure that the -V (-12V) line is OK?

The video RAM is the only user of -5VDC

regards
Dave
by Dave
04 Jul 2020 10:58
Forum: HARDWARE
Topic: Sound and LOAD issues
Replies: 31
Views: 6397

Re: Sound and LOAD issues

cdoty wrote:
04 Jul 2020 09:57
Owning an MTX is definitely an adventure.
Your adventure is about the get substantially better - USPS willing :)
by Dave
04 May 2020 00:11
Forum: TRADING AND COLLECTING
Topic: Seen on eBay...
Replies: 1
Views: 516

Re: Seen on eBay...

Yes, it has a user mod to allow the 56 column CP/M ROM or the SDX ROM to be selected using the switch on the side.

A bit clunky but it works as guess

Regards
Dave
by Dave
11 Feb 2020 00:48
Forum: OFF TOPIC
Topic: PCBs for Spectrum Clones
Replies: 17
Views: 2256

Re: PCBs for Spectrum Clones

Martin A wrote:
11 Feb 2020 00:03
So, is anyone else ready to take up the challenge ?
Almost :-)

It’s on somewhat lengthy “to-do” list!
by Dave
02 Feb 2020 20:13
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 64
Views: 9783

Re: Another Home-Brew - Z180

Bill,

I can send you a known working 7128S if you like, that would eliminate a locked out jtag port problem

Regards
Dave
by Dave
02 Feb 2020 15:30
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 64
Views: 9783

Re: Another Home-Brew - Z180

Bill,

are you sure of the CPLDs? Some of the ones that I got from Lez had the JTAG ports locked out, if that is the problem, there is no way to reset them without an Altera Master Programmer - which are unobtanium these days.

If you are using Quartus, what is the error code/message?

regards
Dave
by Dave
01 Feb 2020 13:22
Forum: OFF TOPIC
Topic: PCBs for Spectrum Clones
Replies: 17
Views: 2256

Re: PCBs for Spectrum Clones

AD724JR SOP-16, £1.44 from China in singles, less for 5 or 10 pieces

regards
Dave
by Dave
16 Jan 2020 12:51
Forum: SOFTWARE
Topic: Possibly hundreds (?) of new games for the MTX
Replies: 27
Views: 3387

Re: Possibly hundreds (?) of new games for the MTX

Well, not everyone :D