Search found 410 matches

by Martin A
19 Aug 2019 23:17
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 4
Views: 42

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: 4
Views: 42

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: 1748

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: 1748

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 135 times
And did the diagnostics (but not show !)
diag bits.jpg
Diag commands as req'd
diag bits.jpg (584.21 KiB) Viewed 135 times
by Martin A
14 Jul 2019 18:09
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 48
Views: 1329

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: 348

Re: A bit early.

Andy's volunteered, well done Mr K !

See the post on Facebook for the date vote.
by Martin A
09 Jul 2019 19:17
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 1748

Re: Bootstrap and boot blocks

Bill B wrote:
09 Jul 2019 09:25
CFX Fuzix now running on MEMU :)
Nice one!
by Martin A
07 Jul 2019 18:21
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 48
Views: 1329

Re: MTX 512 (debugging thread)

It look to me like the pattern has a repeat of 64, which would normally suggest the A6 address line might be involved.

Of course Texas labelled the VDP backwards, so maybe check AD1 for shorts and such ?

AD1 goes to the VRAM at 7G so that could be a suspect.
by Martin A
06 Jul 2019 20:05
Forum: NEW HARDWARE
Topic: ROTT 1600
Replies: 1
Views: 90

ROTT 1600

I've basically finished putting the extra components onto the memory board I build for Fuzix testing. It's time to introduce the ROTT 1600k memory board. rott 1600.jpg Currently fitted is a CFX style 16 bit IDE interface 2 x 512k srams, of which 448k can be seen from basic and 720k in CPM. (making 5...
by Martin A
05 Jul 2019 12:20
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 1748

Re: Bootstrap and boot blocks

I've finished wiring up a memory expansion with a full complement of RAM available in CPM mode. Which means Fuzix is now booting on my MTX512 :) There's none of the display issues seen on the MTXplus either. Fuzix booting.jpg It's only reporting 15 memory banks, so is seeing 720k, of which 672k is a...