Search found 322 matches

by troed
Tue Sep 18, 2018 7:20 pm
Forum: ALPHA USER BUILDS
Topic: Icky - Progress
Replies: 33
Views: 283

Re: Icky - Progress

exxos wrote:
Tue Sep 18, 2018 7:18 pm
Icky wrote:
Tue Sep 18, 2018 7:17 pm
Great fun - just been hunting for 2.2k resistors in my parts bins. None to be found time to start desoldering some from that donor ST I have.
4.7K, 10K should be ok as well...
Get a SIL array from the donor - they're 10 or 4.7k
by troed
Tue Sep 18, 2018 7:19 pm
Forum: STF REMAKE PROJECT
Topic: TOS startup sequence.
Replies: 13
Views: 175

Re: TOS startup sequence.

exxos wrote:
Tue Sep 18, 2018 7:17 pm
Would be all zeros for black though wouldn't it ?
No, think palette. Color 0 is white (border color) and color 15 (low res) is black. So, if all bitplanes are 1s the "graphics" is an image of all palette color 15 = black.

Unless I'm not thinking straight. Have a fever.
by troed
Tue Sep 18, 2018 7:16 pm
Forum: STF REMAKE PROJECT
Topic: TOS startup sequence.
Replies: 13
Views: 175

Re: TOS startup sequence.

exxos wrote:
Mon Sep 17, 2018 11:05 pm
It sparked my interest as if 50Hz is being set, but not the palette data (still black screen) what actually goes on in the code between those 2 things ?
Actually a white border and black screen would indicate all 1s being read from RAM, I think.
by troed
Tue Sep 18, 2018 7:14 pm
Forum: STF REMAKE PROJECT
Topic: TOS startup sequence.
Replies: 13
Views: 175

Re: TOS startup sequence.

Alright, here's a cleaned up (TOS 3.x/4.x/STBOOK stuff etc removed - I hope I got the sections right) startup.S from the TOS source code package: _main: /* disable the interrupts */ /* this is useless on cold boot, */ /* but it matters for software reset */ move #$2700,sr reset /* reset all hardware...
by troed
Tue Sep 18, 2018 6:35 pm
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 26
Views: 450

Re: ALPHA MODIFICATIONS

exxos wrote:
Tue Sep 18, 2018 6:32 pm
troed wrote:
Tue Sep 18, 2018 6:29 pm
I'm confused by this being connected to BR.
Its a missing pull up resistor on BR & BGACK.
Yes. But both the pullup fixes are connected to BR, none of them to BGACK :)
by troed
Tue Sep 18, 2018 6:29 pm
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 26
Views: 450

Re: ALPHA MODIFICATIONS

exxos wrote:
Tue Sep 18, 2018 6:23 pm
Bodge resistor 1..... 2.2K between the 2 circled points on back of CPU socket...
I'm confused by this being connected to BR.
by troed
Tue Sep 18, 2018 5:19 pm
Forum: ALPHA USER BUILDS
Topic: Forgottenmyname - Progress
Replies: 31
Views: 263

Re: Forgottenmyname - Progress

Forgottenmyname wrote:
Tue Sep 18, 2018 5:11 pm
I might make a new cable with hsync and hsync. Would everything else be the same minus the comp sync obviously
Measure them at the monitor port first :) But yeah, if they're ok there then you should have a stable image and maybe csync for some reason is off.
by troed
Tue Sep 18, 2018 4:05 pm
Forum: ALPHA USER BUILDS
Topic: Forgottenmyname - Progress
Replies: 31
Views: 263

Re: Forgottenmyname - Progress

As of today I still get the rolling screen after applying the sync mod on U51. The Glue is still sending out 15khz on 37 and 60hz on 38. What do you have on the monitor port then? If HSYNC and VSYNC are steady at 15kHz and 60Hz you should not have a rolling screen ... unless your TV cannot handle 6...
by troed
Tue Sep 18, 2018 2:19 pm
Forum: STF REMAKE PROJECT
Topic: TOS startup sequence.
Replies: 13
Views: 175

Re: TOS startup sequence.

exxos wrote:
Tue Sep 18, 2018 1:37 pm
Can someone post the source file here ? Would be even better if someone could maybe label up exactly what is going on in the startup code step by step.
Yeah I had that thought yesterday when looking through it, just need to manually remove all ifdef:ed code only valid for TT/Falcon.
by troed
Tue Sep 18, 2018 12:30 pm
Forum: STF REMAKE PROJECT
Topic: PCB Build - Progress - Post your Pics here :-)
Replies: 132
Views: 2234

Re: PCB Build - Progress - Post your Pics here :-)

Forgottenmyname wrote:
Tue Sep 18, 2018 11:08 am
BOMBS, we have bombs!
Alright! We're done. That's the most common ST screen anyway :D