Search found 161 matches

by RMartins
Mon Feb 19, 2018 7:20 pm
Forum: Programming
Topic: Fastest Divide by 6
Replies: 25
Views: 564

Re: Fastest Divide by 6

Wall_Axe wrote:
Mon Feb 19, 2018 6:00 pm
why is the number being compared to 10,20,40?
...
Those are just multiples of 5, that match the specific bit that will be set, if condition holds true.

40 / 5 = 8 (bit3)
20 / 5 = 4 (bit2)
10 / 5 = 2 (bit1)
by RMartins
Mon Feb 19, 2018 7:15 pm
Forum: Hardware
Topic: 48K Issue 6A
Replies: 8
Views: 340

Re: 48K Issue 6A

Finally got some time yesterday, to work on this again. I just tried using my new Hot Hair blower/SMD re-work station, and started removing the hottest memory chip in upper memory. Since chips are so close to each other, I had to removed 2 instead of one. Checked for solder splatters, and then teste...
by RMartins
Mon Feb 19, 2018 6:40 pm
Forum: Hardware
Topic: NOXROM Cartridge
Replies: 26
Views: 560

Re: NOXROM Cartridge

^^^ Sounds good.. you mean an interface to make Sinclair macines manage up to 80K? I assume games which are based on that limit would work on Amstrad machines too Most probably it will not be an interface, since you have to manage the following (t least): - replace high memory with new 64K 4116 chi...
by RMartins
Mon Feb 19, 2018 6:34 pm
Forum: Brand new software!
Topic: Extruder
Replies: 21
Views: 473

Re: Extruder

I found a video, by someone that plays well enough to show the true colors of this game.
https://www.youtube.com/watch?v=J4Arqn2q32M

But 2 humans battling each other, is a lot more fun to watch/play.
by RMartins
Mon Feb 19, 2018 4:16 pm
Forum: Brand new software!
Topic: Extruder
Replies: 21
Views: 473

Re: Extruder

I intend to do a video session, of me playing the arcade with a friend, so that you guys, can understand what this game really is about.
Speed !!!

Most videos available online, do not make it justice.
by RMartins
Mon Feb 19, 2018 3:50 pm
Forum: Hardware
Topic: NOXROM Cartridge
Replies: 26
Views: 560

Re: NOXROM Cartridge

I have been thinking on something for some time, which is to find a way to make use of the actual extra memory on a ZX Spectrum 48K. To save some bucks, ZX spectrums use 8 times 64Kx1 bit memory chips, but they either user the lower or the upper part of the chip (only 32K, since the other part is fl...
by RMartins
Mon Feb 19, 2018 1:19 am
Forum: Brand new software!
Topic: Extruder
Replies: 21
Views: 473

Re: Extruder

Here is an update to solve a few minor gameplay issues:
Extruder.TAP

The Ball color being grabbed is now shown.

Also reviewed instructions
Instructions
by RMartins
Sun Feb 18, 2018 11:31 pm
Forum: Programming
Topic: Fastest Divide by 6
Replies: 25
Views: 564

Re: Fastest Divide by 6

If I'm not mistaken, that's the usual way to make a divison, bit by bit, except that in this case, it's optimized to match division by 5, since consecutive multiples of 5 are being checked.
by RMartins
Sat Feb 17, 2018 8:44 pm
Forum: Hardware
Topic: NOXROM Cartridge
Replies: 26
Views: 560

Re: NOXROM Cartridge

--- I've been told that it is impossible to plug anything into a 48k machine to convert it to 128K. It is necessary to open it and disconnect the upper 32K RAM. ... If you really want to do that, you can start with a 16K Spectrum, and then add an external interface with the required RAM and paging ...
by RMartins
Sat Feb 17, 2018 8:29 pm
Forum: Showcase your work!
Topic: ZEXED
Replies: 8
Views: 361

Re: ZEXED

One more vote for you to finish it :)