Search found 237 matches

by Bill B
04 Jan 2020 21:35
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 53
Views: 8136

Re: Another Home-Brew - Z180

The problem with that is if the wires go right through, and are then bent over the bottom mask is that they then lift the bottom mask off of the the glass plate, so that the mask is no longer pressed firmly against the copper.
by Bill B
04 Jan 2020 11:48
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 53
Views: 8136

Re: Another Home-Brew - Z180

Did both of those. The board cut lines are extended well beyond the edges of the board, and can be used to align the top and bottom masks. The boards do not have any mounting holes, too packed. However, prior to etching I drilled two of the component mounting holes (in opposite corners) through both...
by Bill B
31 Dec 2019 17:49
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 53
Views: 8136

Re: Another Home-Brew - Z180

PCB_Detail.png I am going to have to re-think my PCB designs again. With a home made PCB it is necessary to solder small pieces of wire between the upper and lower pads of a via. My soldering is not good enough to do this between pads at 0.05 inch spacing without creating shorts between pads or tra...
by Bill B
30 Dec 2019 12:59
Forum: SOFTWARE
Topic: Possibly hundreds (?) of new games for the MTX
Replies: 27
Views: 2807

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

Attached is a bug fix to my implementation of the Z-Machine for MTX CP/M. Also included is a version (M576ZVM.COM) for machines with an additional 512K of RAM, which can load the entire story file into memory. Note this RAM is accessed directly, any RAM disk will be trashed. To obtain a measure of r...
by Bill B
29 Dec 2019 10:19
Forum: SOFTWARE
Topic: Possibly hundreds (?) of new games for the MTX
Replies: 27
Views: 2807

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

Possibly, for whomever has the time. Not me, I have already got too many projects that are not getting completed because of diversions :roll:
by Bill B
27 Dec 2019 21:58
Forum: SOFTWARE
Topic: Possibly hundreds (?) of new games for the MTX
Replies: 27
Views: 2807

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

It does not look like the source is available, so that is not a port, it would be a reverse engineer.
by Bill B
27 Dec 2019 21:53
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 53
Views: 8136

Re: Another Home-Brew - Z180

Including a Propeller Chip and level shifters on the Peripherals board is defenitly tight. I did not have any spare space for mounting holes. By doing some address decoding for the Propeller in the CPLD, there are some Propeller I/O pins spare, so as well as VGA out it is (from a hardware point of v...
by Bill B
27 Dec 2019 16:37
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 53
Views: 8136

Re: Another Home-Brew - Z180

20191227_140543.jpg Well this is an improvement on my previous attempt :) I purchased a 230 x 160 mm board from RS. That gives me two 160 x 100 mm boards, plus a 30mm spare strip to provide exposure test pieces. On close examination it is not perfect. There are places where pads are connected to th...
by Bill B
26 Dec 2019 13:11
Forum: SOFTWARE
Topic: Possibly hundreds (?) of new games for the MTX
Replies: 27
Views: 2807

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

By totally re-writing the virtual memory code, using different algorithms, I have speeded up the program (factor of three by one estimate). However I am still not sure it is fast enough to be playable :( Profiling shows that VM access is still the bottleneck. If anyone else wants to have a hack, exe...
by Bill B
23 Dec 2019 23:57
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 53
Views: 8136

Re: Another Home-Brew - Z180

Martin, My Z180 project has got stalled a bit, delayed by software distractions from Memofest and otherwise. I hope to get back to it after Christmas. However, I am certainly considering making use of a variant of my Propeller 80 column display. As per an earlier post, my peripherals board is curren...