Search found 2758 matches

by Dave
Sat May 13, 2017 7:10 pm
Forum: Hardware
Topic: QL prototyping board...
Replies: 8
Views: 4387

Re: QL prototyping board...

There's are a couple of ways to do it. It depends if you just want to pass a. Yet back and forth or if you want to address a block of memory. It would need some hefty GPIO on the pi's side.

I'll email you in a bit and we can talk more about it.
by Dave
Sat May 13, 2017 2:22 pm
Forum: Hardware
Topic: QL Hard Disk 40MB from Miracle Systems
Replies: 23
Views: 9589

Re: QL Hard Disk 40MB from Miracle Systems

The unit is very easy to modify. I have one that I often use and was planning to replace or refresh the PSU because the caps are getting old. I'll take photos when I do it. There's a LOT of room in the case, so....
by Dave
Wed May 10, 2017 6:17 pm
Forum: Hardware
Topic: Microdrive Motor Adjustment
Replies: 54
Views: 26891

Re: Microdrive Motor Adjustment

They're potted with epoxy. Use a commercial epoxy dissolver like Loctite 76820. Google what's available in your area.
by Dave
Wed May 10, 2017 3:39 pm
Forum: Hardware
Topic: New QL backplane.
Replies: 54
Views: 26520

Re: New QL backplane.

I'm now on a road trip to visit with a QLer in Tennessee. I'll be back next Thursday so there will be something to report then ;)
by Dave
Wed May 10, 2017 3:37 pm
Forum: Hardware
Topic: QL hardware info needed!
Replies: 3
Views: 1847

Re: QL hardware info needed!

Well, QubIDE's one of the very few cards where you can change the base address ;)
by Dave
Wed May 10, 2017 3:36 pm
Forum: Hardware
Topic: ATX backplane prototype...
Replies: 8
Views: 3689

Re: ATX backplane prototype...

It has a 3D printed frame with card guides already, so.... ;)

As for it being buffered, that's a complex subject. I welcome your thoughts.
by Dave
Wed May 10, 2017 12:26 am
Forum: Hardware
Topic: QL hardware info needed!
Replies: 3
Views: 1847

QL hardware info needed!

Hi all, I need your help. I am trying to build a table of every QL expansion and where it resides in the expansion area of the memory map. I will add all responses to the table below. The information I need is: Expansion name Expansion version ROM version ROM size Location in memory As I get respons...
by Dave
Tue May 09, 2017 6:14 pm
Forum: General QL Chat
Topic: QL Homepage Is Back!
Replies: 18
Views: 10509

Re: QL Homepage Is Back!

My connection is around 300 mbit/sec so it wouldn't take too long. I'll set it up immediately I return from my road trip.
by Dave
Tue May 09, 2017 4:39 pm
Forum: Hardware
Topic: Ql Issue/Problem
Replies: 13
Views: 5760

Re: Ql Issue/Problem

Is /RAS noisy at pin 8 of the 8301? RAS and CAS only go from pins 8 and 10 of the 8301 to the 16 DRAM ICs and nowhere else, with nothing intervening either. Either the 8301 is outputting a noisy signal, or a RAM is doing something nasty with it.
by Dave
Tue May 09, 2017 4:33 pm
Forum: The Welcome Area
Topic: Hello from France
Replies: 9
Views: 5627

Re: Hello from France

Hmmm. I better dig mine out and check for that. :/ I had to buy a US PSU specially when I moved here.