Search found 2936 matches

by exxos
Tue Sep 18, 2018 7:17 pm
Forum: STF REMAKE PROJECT
Topic: TOS startup sequence.
Replies: 13
Views: 175

Re: TOS startup sequence.

troed wrote:
Tue Sep 18, 2018 7:16 pm
Actually a white border and black screen would indicate all 1s being read from RAM, I think.
Would be all zeros for black though wouldn't it ?
by exxos
Tue Sep 18, 2018 6:53 pm
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 26
Views: 450

Re: ALPHA MODIFICATIONS

5 RESISTOR FIX

<shame mode>

Fix for missing pull up resistors on, LDS,UDS,RW,AS,BGACK

5 highlighted pins, wire each to a 2.2K resistor, and wire the other ends to 5V (top end of C21 is 5V)

fu1.jpg
fu1.jpg (85.63 KiB) Viewed 34 times

</shame mode>
by exxos
Tue Sep 18, 2018 6:48 pm
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 26
Views: 450

Re: ALPHA MODIFICATIONS

:headbang: :headbang: :headbang: :headbang:

Looks like I've missed a resistor pack off, as some more pins haven't go pull ups either.. will post fixes shortly....
by exxos
Tue Sep 18, 2018 6:42 pm
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 26
Views: 450

Re: ALPHA MODIFICATIONS

Forgottenmyname wrote:
Tue Sep 18, 2018 6:38 pm
Just put the /BGACK resistor in and now /BGACK, /BG & /BR all stay high, do i need to put that link to thepullups?
Check back as I updated a image just...

viewtopic.php?f=19&t=1185&start=10#p10084
by exxos
Tue Sep 18, 2018 6:41 pm
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 26
Views: 450

Re: ALPHA MODIFICATIONS

troed wrote:
Tue Sep 18, 2018 6:35 pm
Yes. But both the pullup fixes are connected to BR, none of them to BGACK :)
oops... Updated the image...
by exxos
Tue Sep 18, 2018 6:32 pm
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 26
Views: 450

Re: ALPHA MODIFICATIONS

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.
by exxos
Tue Sep 18, 2018 6:27 pm
Forum: ALPHA USER BUILDS
Topic: Forgottenmyname - Progress
Replies: 31
Views: 263

Re: Forgottenmyname - Progress

I think BR is probably confusing the GLUE.. got 2 fixes for that now though :)
by exxos
Tue Sep 18, 2018 6:25 pm
Forum: ALPHA USER BUILDS
Topic: Icky - Progress
Replies: 33
Views: 283

Re: Icky - Progress

Forgottenmyname wrote:
Tue Sep 18, 2018 6:25 pm
Ah, the life of a guinea pig :D
So much fun to be had :P :lol: :twisted:
by exxos
Tue Sep 18, 2018 6:23 pm
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 26
Views: 450

Re: ALPHA MODIFICATIONS

BGACK PULL UP FIX

Bodge resistor 1..... 2.2K between the 2 circled points on back of CPU socket...

(fixes missing pull up on BGACK)

f2.jpg
f2.jpg (181.48 KiB) Viewed 10 times
by exxos
Tue Sep 18, 2018 6:18 pm
Forum: ALPHA USER BUILDS
Topic: Icky - Progress
Replies: 33
Views: 283

Re: Icky - Progress

Icky wrote:
Tue Sep 18, 2018 6:13 pm
OK - Lets give it a go
Looks like BGACK hasn't a pull up either :roll: out of room on the RP's, so bodge resistor time...