Search found 165 matches

by Bill B
20 Aug 2019 08:10
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 4
Views: 42

Re: Another Home-Brew - Z180

What I have is Z8S18033VSC.

The way I read the datasheet I have:
  • Z8S180 is for 5v parts
  • Z8L180 is for 3.3v parts.
It also suggests that Z8L parts are only available up to 20MHz (the higher speed needs a higher voltage).
by Bill B
18 Aug 2019 21:56
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 4
Views: 42

Re: Another Home-Brew - Z180

Attached is a planned circuit diagram. The Z180 has a 1MB external address space which is mapped onto the 64KB address space of the Z80 core in three areas, which the Zilog documentation designates as (from low internal address to high): Common Area 0 Bank Area Common Area 1 The boundaries between t...
by Bill B
13 Aug 2019 16:06
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 4
Views: 42

Another Home-Brew - Z180

Having taken advantage of Lez Anderson's extremely generous offer of free chips for a second time, I thought I should nail my colours to the mast and publicly commit to doing something with them. What attracted me to the latest offer from Lez was the inclusion of Z180 CPUs. The idea of building a fa...
by Bill B
22 Jul 2019 18:26
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 1748

Re: Bootstrap and boot blocks

Dave, Standard Unix / Linux / Fuzix / Raspbian :) Unlike Windows, the current directory is not (generally) in the path. Therefore if you want to run a file in the current directory you have to specify "./filename" not just "filename. That is a "dot" (for current directory), a "slash" (the path separ...
by Bill B
21 Jul 2019 18:46
Forum: MEMOFEST 2019
Topic: Memofest 2019 at Andys
Replies: 1
Views: 63

Re: Memofest 2019 at Andys

Thanks Andy.

I don't do Facebook so unable to vote. I will try and come whatever date selected, although in general later in October is better for me.

No surprises from me this year. All my Memotech time has gone on software, which Dave has already published.
by Bill B
20 Jul 2019 17:21
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 1748

Re: Bootstrap and boot blocks

Alan, a request from Dave. As you know, the MTX keyboard matrix potentially supports 80 keys, only 77 of which are implemented in hardware. The three unused locations are used by the PC keyboard interface , MTX+ and my version of MEMU to implement virtual keys with characters having the same shift s...
by Bill B
14 Jul 2019 13:41
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 1748

Re: Bootstrap and boot blocks

Rather off-topic for this thread, but to finish up the discussion of the memu-cfg issue, the causes were: A mis-understanding on my part :? I thought that there was only one UI thread, whereas there is actually one per window. I also hadn't appreciated the consequences of the keypress () and keyrele...
by Bill B
14 Jul 2019 08:41
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 1748

Re: Bootstrap and boot blocks

Yes, the bug is in the VDP code, but not related to Fuzex. It happens even when emulating an MTX 512. The symptoms: Start memu-cfg. Tap the "Menu" key to open the configuration window. Select "Exit" from the bottom line of the window. The configuration window closes. What should then happen is the r...
by Bill B
09 Jul 2019 21:18
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 1748

Re: Bootstrap and boot blocks

Dave, Some changes to MEMU: Mods to allow mounting Alan's image as an image of the whole card rather than just one CP/M partition. As reported, fixes to the emulation of the CF Identify command. I was just merging together these changes (done on Linux) with the Windows version to send to you, when I...
by Bill B
09 Jul 2019 09:25
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 1748

Re: Bootstrap and boot blocks

Stupidity in emulation of Identify command found :oops:

CFX Fuzix now running on MEMU :)
MEMU_Fuzix_2.png
MEMU_Fuzix_2.png (10.34 KiB) Viewed 197 times