Search found 414 matches

by Martin A
15 Sep 2019 15:14
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 21
Views: 489

Re: Another Home-Brew - Z180

Is it worth feeding 0v to the 2 no connects on the rom socket, just in case you need to fit a larger Flash in there for any reason.

Or jumper them for either voltage to allow for multiple rom images ??
by Martin A
09 Sep 2019 19:50
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 21
Views: 489

Re: Another Home-Brew - Z180

That's an interesting discovery. Tony's flexible clocking system for the MTX plus uses the EPM7128. That's driving the clock on the Z80 (and everything else), which has the same input spec as the Z180. And it works, even though perhaps it shouldn't, maybe it's a good thing I'd not read that part of ...
by Martin A
01 Sep 2019 12:55
Forum: HARDWARE
Topic: Resurrecting an MTX500.
Replies: 226
Views: 10675

Re: Resurrecting an MTX500.

Did the TIP ever get replaced ??
by Martin A
31 Aug 2019 22:32
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 21
Views: 489

Re: Another Home-Brew - Z180

How about using stripboard for a backplane, and then making your own daughterboards. A typical bit of 4" stripboard will give you 39 strips. Use the plentiful 40 way 0.1" right angle pins trips and sockets to make the connections like an RC2014 or similar. That only needs soldering and it doesn't ne...
by Martin A
19 Aug 2019 23:17
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 21
Views: 489

Re: Another Home-Brew - Z180

Which Z180 is it, the likes of Mouser seem to imply the 20mhz part is 3.3v, while the 10mhz and 33mhz are 5v. The data sheet isn't very clear either.
by Martin A
14 Aug 2019 19:14
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 21
Views: 489

Re: Another Home-Brew - Z180

I'll be very interested to see the SPI results. CF is getting harder to source at reasonable prices do SPI/SD has more of a future. Even cheaper than SD, if you can mount it is something like: https://www.mouser.co.uk/ProductDetail/Winbond/W25Q64JVSSIQ?qs=sGAEpiMZZMtLtwjrIQVJ5joXWQlLhvyQ9W4OsigQXFtO...
by Martin A
27 Jul 2019 12:46
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 3356

Re: Bootstrap and boot blocks

I tried STTY rows 24 columns 40, to match the text screen's raw size and got an error, it seems I can set the row. But columns isn't recognised and I get an error that 40 isn't a legal speed. STTY on it's own after that reported the rows set to 24 and columns 0. I did try STTY /? but the ? doesn't w...
by Martin A
26 Jul 2019 15:59
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 3356

Re: Bootstrap and boot blocks

Jus in case it helps, I tried the same thing on the real MTX:
adv01.jpg
The adventure output
adv01.jpg (472.89 KiB) Viewed 422 times
And did the diagnostics (but not show !)
diag bits.jpg
Diag commands as req'd
diag bits.jpg (584.21 KiB) Viewed 422 times
by Martin A
14 Jul 2019 18:09
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 48
Views: 2210

Re: MTX 512 (debugging thread)

I'm no expert on the power supply, but circuit diagram http://primrosebank.net/computers/mtx/repairs/regs/mtx_power.htm shows that : The TIP2955 is part of the +5 supply, not the -5. The -5v is derived from the -v supply (-12 ???) using the resistor R60, Zener diode ZD3 and capacitor C49. I would gu...
by Martin A
09 Jul 2019 19:34
Forum: MEMOFEST 2019
Topic: A bit early.
Replies: 7
Views: 532

Re: A bit early.

Andy's volunteered, well done Mr K !

See the post on Facebook for the date vote.