Search found 31 matches
- 03 Apr 2020, 20:27
- Forum: Kit assembly gallery
- Topic: Another Gigatron is alive!
- Replies: 3
- Views: 6658
Re: Another Gigatron is alive!
It sounds very similar to the problems I have with my PS/2 keyboard, quite often it is not working at all and I have to restart everything. I suspect it really is the power supply, at least I get the impression that my chances are different depending on my supply. I guess that some keyboards just dr...
- 25 Jan 2020, 17:52
- Forum: Escape Meta Alt Control Shift
- Topic: UN-unboxing of your Gigatron kit
- Replies: 1
- Views: 6745
Re: UN-unboxing of your Gigatron kit
Nice to see what goes on behind the scenes. Thanks for doing all this work!
- 13 Nov 2019, 19:59
- Forum: Hardware and software hacking
- Topic: vCPU from ROM (or chained SYS functions)
- Replies: 3
- Views: 3490
Re: vCPU from ROM (or chained SYS functions)
SYS_Reset_88 (an internal SYS function) then does some reset work, stuffs SYS_Exec_88 into sysFn and provides an argument, reverts vPC and returns to have the same SYS instruction executed again: Ah, yes, that is basically what I was thinking of. (And with branches where each path gets a different ...
- 29 Sep 2019, 16:43
- Forum: Hardware and software hacking
- Topic: Expansion bus
- Replies: 98
- Views: 95210
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 ...
- 26 Sep 2019, 19:06
- Forum: Hardware and software hacking
- Topic: Expansion bus
- Replies: 98
- Views: 95210
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...
- 26 Sep 2019, 16:43
- Forum: Hardware and software hacking
- Topic: Expansion bus
- Replies: 98
- Views: 95210
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 ...
- 25 Sep 2019, 21:19
- Forum: Hardware and software hacking
- Topic: Expansion bus
- Replies: 98
- Views: 95210
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 do...
- 24 Sep 2019, 19:20
- Forum: Hardware and software hacking
- Topic: Expansion bus
- Replies: 98
- Views: 95210
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...
- 20 Sep 2019, 16:40
- Forum: Hardware and software hacking
- Topic: vCPU from ROM (or chained SYS functions)
- Replies: 3
- Views: 3490
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...
- 18 Sep 2019, 16:39
- Forum: Hardware and software hacking
- Topic: summer time
- Replies: 2
- Views: 3324
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.