Search found 28 matches

by DavidHK
29 Sep 2019, 16:43
Forum: Hardware and software hacking
Topic: Expansion bus
Replies: 77
Views: 6273

Re: Expansion bus

I have now pushed a further change to my emulation work branch that adds a virtual MBR in case the image file starts directly with a FAT32 header. A pure single-partition FAT32 image without an MBR can usually be created easier (by more tools). The next few weeks I probably won't be able to do much ...
by DavidHK
26 Sep 2019, 19:06
Forum: Hardware and software hacking
Topic: Expansion bus
Replies: 77
Views: 6273

Re: Expansion bus

I have now pushed my work so far to my branch (I haven't made a pull request yet, I don't think it is finished at this state). https://github.com/dhkolf/gigatron-rom/tree/dk-libgtemu/Contrib/dhkolf/libgtemu One thing I am not quite happy about is the SD card image. You need not just a partition imag...
by DavidHK
26 Sep 2019, 16:43
Forum: Hardware and software hacking
Topic: Expansion bus
Replies: 77
Views: 6273

Re: Expansion bus

Don't worry, I don't expect CardTest to be more than what the name says -- a test. ;-) But I try to join the test by keeping my emulation somewhere close to the current proposals. And I am also aware that the emulation will not be able to substitute testing with a real SD card -- at least where the ...
by DavidHK
25 Sep 2019, 21:19
Forum: Hardware and software hacking
Topic: Expansion bus
Replies: 77
Views: 6273

Re: Expansion bus

Attached is a screenshot with my work-in-progress so far. Now I have to find out what the issue is, maybe I didn't build the image of the "SD card" properly. At the moment my implementation is far from complete, I am just giving the minimal answers that CardTest.gcl seems to expect -- I don't even c...
by DavidHK
24 Sep 2019, 19:20
Forum: Hardware and software hacking
Topic: Expansion bus
Replies: 77
Views: 6273

Re: Expansion bus

I am currently trying to add the expander to my emulation and I am a bit confused about the MISO lines, maybe I am mixing up the logic levels. As far as I understood from the schematics, the four MISO lines would be pulled high by default, I assumed that to be a 1. To send data from the first SPI po...
by DavidHK
20 Sep 2019, 16:40
Forum: Hardware and software hacking
Topic: vCPU from ROM (or chained SYS functions)
Replies: 1
Views: 115

vCPU from ROM (or chained SYS functions)

I stumbled over this issue on Github for running vCPU programs directly from ROM: https://github.com/kervinck/gigatron-rom/issues/83 I was pondering about it a while now and I've had questions as to how to handle the program counter and such. One solution might be to add another interpreter, but I w...
by DavidHK
18 Sep 2019, 16:39
Forum: Hardware and software hacking
Topic: summer time
Replies: 2
Views: 529

Re: summer time

I know I am digging up a really old thread, but I still wanted to give my praise to this demo! The graphics look great and I see this as a promise as to which kind of games the Gigatron is capable of. I hope to see more of this in the future. ;-)
by DavidHK
16 Sep 2019, 19:31
Forum: Hardware and software hacking
Topic: Playing with sound
Replies: 5
Views: 217

Re: Playing with sound

In my next iteration I have now created "DrumsAD", which uses wavA to apply an envelope to the percussive sound table. Sounds to me like wavA is indeed performing well. Thank you for the hint!
by DavidHK
16 Sep 2019, 18:19
Forum: Kit assembly gallery
Topic: Arrived and running
Replies: 5
Views: 183

Re: Arrived and running

Unfortunately I do not have a proper camera at hand, I tried using my (basic) action camera, but that doesn't really like indoor lighting. Anyway, here is my attempt...
by DavidHK
16 Sep 2019, 17:03
Forum: Hardware and software hacking
Topic: Playing with sound
Replies: 5
Views: 217

Re: Playing with sound

Oh, yes, wavA should do the trick as well, I missed that! With my first PianoBeep demo I was a bit confused about the effect of wavA as all the values from 1 to 63 just turned the pulse wave silent -- but the values between 64 and 127 work like a charm. That should simplify matters a lot as now my p...