Search found 257 matches

by Paul
Wed May 24, 2017 6:58 am
Forum: Hardware
Topic: Discussion about connecting RASPI to QL
Replies: 58
Views: 10694

Re: Discussion about connecting RASPI to QL

Anyway, if there are unused GPIO pins on the PI I would definitely fill them with address lines as far as possible. Your estimation is that the PI would be to slow to host the ROM Image you want to read by the QL? I am thinking about the possibilities of the PI like read/write to SD Cards or USB dis...
by Paul
Wed May 24, 2017 6:43 am
Forum: Hardware
Topic: Discussion about connecting RASPI to QL
Replies: 58
Views: 10694

Re: Discussion about connecting RASPI to QL

I am not shure if ths was intended as an answer to my last post/question :oops:
by Paul
Wed May 24, 2017 6:19 am
Forum: Hardware
Topic: Discussion about connecting RASPI to QL
Replies: 58
Views: 10694

Re: Discussion about connecting RASPI to QL

This looks like the start signal for my GAL equations ;) About the CLK brought through to PI: I think its better to tell the PI what to do instead of having it decide things because of own analysis. about clk speed, i'd prefer to use one of the 16K "registers" for passing this info Having ...
by Paul
Mon May 22, 2017 10:44 am
Forum: Hardware
Topic: QLAN-USB Adapter - working prototype...
Replies: 50
Views: 11616

Re: QLAN-USB Adapter - working prototype...

Very interresting indeed, I'd love to have one...
by Paul
Mon May 22, 2017 8:43 am
Forum: Hardware
Topic: New QL backplane.
Replies: 54
Views: 11264

Re: New QL backplane.

I'd like to have three PCB only and don't care about the hole size. A single manual (or download) will be sufficient. PayPal for friends is ok?
Kind regards Paul
by Paul
Mon May 22, 2017 7:09 am
Forum: Hardware
Topic: Discussion about connecting RASPI to QL
Replies: 58
Views: 10694

Re: Discussion about connecting RASPI to QL

I definitely prefer the 74LVX245 version. And I could try the GAL equations. But I am not very good at these.
This would be some practice for me.
Kind regards
Paul
by Paul
Fri May 19, 2017 5:47 pm
Forum: Hardware
Topic: New QL backplane.
Replies: 54
Views: 11264

Re: New QL backplane.

Dave wrote:That's not even funny.

I'm sorry. I meant it to be a joke. I shouldn't try posting funny thing when I don't understand the language enough.
Kind regards Paul
by Paul
Fri May 19, 2017 5:41 pm
Forum: Compatibles Corner
Topic: Using big ROMs on Q40
Replies: 4
Views: 1881

Re: Using big ROMs on Q40

I would add two resistors between switch and 5V and between switch and 0V. Any value between 1K and 10K would be good. I have seen cheap switches that made short circuits while switching and catching fire at high amperes. If you just need a high or low level other than fixed on pcb (meaning using a ...
by Paul
Fri May 19, 2017 5:01 am
Forum: Hardware
Topic: New QL backplane.
Replies: 54
Views: 11264

Re: New QL backplane.

Dave wrote:and a disclaimer about overloading your QL power supply if you put three SGCs on it!

So you could attach 12 ED floppy disk drives? :mrgreen:
by Paul
Wed May 17, 2017 9:59 pm
Forum: Hardware
Topic: New QL backplane.
Replies: 54
Views: 11264

Re: New QL backplane.

Looks great! Thanks for the update Dave.