Search found 405 matches

by rpineau
Fri Sep 01, 2017 6:27 pm
Forum: HARDWARE ISSUES
Topic: TT issues. Help welcome...
Replies: 39
Views: 10521

Re: TT issues. Help welcome...

The floppy drive led is driven by the D0SEL signals from a 74LS31, so it doesn't involves the DMA, 1772 or 74LS06.
This signals comes from the YM2149 I/O port IOA1 (pin 20).
So we really need to see if it turns and move the head to seek the Track0 sensor.
Rodolphe
by rpineau
Fri Sep 01, 2017 6:08 pm
Forum: MEMBER BLOGS
Topic: MegaST to be restored
Replies: 6
Views: 2990

Re: MegaST to be restored

"to be restored".. so it doesn't work ?
Can you describe what it does ? (or doesn't do :) ).
Rodolphe
by rpineau
Fri Sep 01, 2017 4:47 pm
Forum: HARDWARE ISSUES
Topic: TT issues. Help welcome...
Replies: 39
Views: 10521

Re: TT issues. Help welcome...

This seem to be pointing towards the 74ls06.
Once you can answer exxos questions we might have a better idea.
Rodolphe
by rpineau
Thu Aug 31, 2017 5:03 pm
Forum: HARDWARE ISSUES
Topic: TT issues. Help welcome...
Replies: 39
Views: 10521

Re: TT issues. Help welcome...

On the TT the SCSI drive doesn't go through the ST DAM but use another DMA controller. The ST DMA is used for the floppy and the ST DMA port on the back of the TT. The SCSI controller (Z85C30) is driver by the DMAC and DCU component (U900 and U901). So the fact that the SCSI workd doesn't mean there...
by rpineau
Thu Aug 31, 2017 12:26 am
Forum: HARDWARE DISCUSSIONS
Topic: Side Project: rPi (CosmosEx) as HDMI graphics card
Replies: 17
Views: 4423

Re: Side Project: rPi (CosmosEx) as HDMI graphics card

@Gunstick : I totally understand what your intention is. And it would work for all text windows drawn via the VDI. But if you need to display a picture you still need to send the full bitmap ove the RPI (with palette info if needed). So as you say, photo editing or even just viewing would be slow (w...
by rpineau
Wed Aug 30, 2017 5:15 pm
Forum: HARDWARE DISCUSSIONS
Topic: Side Project: rPi (CosmosEx) as HDMI graphics card
Replies: 17
Views: 4423

Re: Side Project: rPi (CosmosEx) as HDMI graphics card

I have been talking to a use on Hackaday.io who's making a video card based on the iCE40 FPGA for his 68K board. He told me that we can use his code as we see fit (planing it for the 68020/68030 card). Adapting it for VME shouldn't be hard either once we have some working code. This will be a lot fa...
by rpineau
Tue Aug 29, 2017 8:11 pm
Forum: HARDWARE ISSUES
Topic: TT issues. Help welcome...
Replies: 39
Views: 10521

Re: TT issues. Help welcome...

Yea, try without the TT Ram, see if you can get the drive working.
Then we'll move on the TTRam "fixing" (or at least diagnosing).
Rodolphe
by rpineau
Tue Aug 29, 2017 6:45 pm
Forum: CHAT FORUM
Topic: Simon's cat
Replies: 12
Views: 3866

Re: Simon's cat

Brilliant !
by rpineau
Tue Aug 29, 2017 5:59 pm
Forum: CHAT FORUM
Topic: Simon's cat
Replies: 12
Views: 3866

Re: Simon's cat

Ok.
I don't do FB :) , so no FB account. And it's probably blocked by my uBlock plugin :)
No worries ;)
by rpineau
Tue Aug 29, 2017 5:42 pm
Forum: CHAT FORUM
Topic: Simon's cat
Replies: 12
Views: 3866

Re: Simon's cat

nothing shows on Chrome for me... big nothing
Are you using flash ?
Rodolphe

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