Search found 2124 matches

by tofro
Thu May 06, 2021 10:39 am
Forum: Software & Programming
Topic: When did OPEN_IN start working on Directory Devices?
Replies: 4
Views: 134

Re: When did OPEN_IN start working on Directory Devices?

I might be going mad (going????) but I'm sure that OPEN_IN #3,'ram1_' used to barf but it now works under SMSQ (on QPC at least) and I was wondering how long, has this been going on. (I hear a song!). In addition to successfully opening the device, it does also allow me to read the directory in 64 ...
by tofro
Thu May 06, 2021 10:30 am
Forum: Hardware
Topic: PiStorm
Replies: 25
Views: 828

Re: PiStorm

Is it done by RPi GPIO oder did they at least use the SMI bus? There doesn't appear to be any schematic, but according to the sources it's a simple 16-bit GPIO interface. Probably wrong, according to a post on English Amiga board" http://eab.abime.net/showthread.php?t=104462 PiStorm at least u...
by tofro
Thu May 06, 2021 10:23 am
Forum: Software & Programming
Topic: Sinclair QL (cross) development and emulation questions
Replies: 23
Views: 660

Re: Sinclair QL (cross) development and emulation questions

If the changes written to the video register are immediate, this would imply that mixed video modes are possible? Like part of the screen using a 512 width and parts of the screen 256 width, assuming one can get the code to execute cycle exact. This is interesting to figure out! You might want to h...
by tofro
Thu May 06, 2021 10:12 am
Forum: Software & Programming
Topic: Sinclair QL (cross) development and emulation questions
Replies: 23
Views: 660

Re: Sinclair QL (cross) development and emulation questions

Hi! I assume that the Vsync interrupt isnt programmable, but only observable. I have a few broad questions with regards to the cpu and the vsync behaviour: That assumption is correct. Is it known how many cycles there are per vblank? I would guess around 150240, but I wonder if there is an exact nu...
by tofro
Wed May 05, 2021 10:54 pm
Forum: Software & Programming
Topic: Sinclair QL (cross) development and emulation questions
Replies: 23
Views: 660

Re: Sinclair QL (cross) development and emulation questions

This makes me wonder tho, does the Sinclair QL have any programmable interrupts and or programmable interval timers, possibly not; Ill have to check. Other than the 50Hz interrupt, no. The real time clock ticks independently from that in 1s intervals, but that might be a little bit slow for your pu...
by tofro
Wed May 05, 2021 3:48 pm
Forum: Hardware
Topic: Sinclair QL Storage Solutions
Replies: 15
Views: 509

Re: Sinclair QL Storage Solutions

Probably yes. (And yes, there are only very few "good" games for the QL). The QL never really attracted any of the larger software houses (except, maybe, Psion), thus mainly had games software from kitchen table coder origin. There are a few exceptians like Jungle Eddi or Alien Hijack that...
by tofro
Wed May 05, 2021 2:46 pm
Forum: Software & Programming
Topic: Sinclair QL (cross) development and emulation questions
Replies: 23
Views: 660

Re: Sinclair QL (cross) development and emulation questions

If your interest is swift turnaround, I'd definitely recommend not cross-assembly, but rather native builds on an emulator - for two reasons: ⋅ There's no fixed addresses in QDOS except the hardware, everything is floating. This requires QL programs to be 100% position-independant code (th...
by tofro
Wed May 05, 2021 9:47 am
Forum: Hardware
Topic: Sinclair QL Storage Solutions
Replies: 15
Views: 509

Re: Sinclair QL Storage Solutions

The choice of storage options should actually be your second choice. First, you should decide whether you want a memory expansion or not (it's pretty likely you will - a non-memory-expanded QL is actually a nuisance ;) ). If you decide against a memory expansion, vDrive is the way to go. QL-SD will ...
by tofro
Tue May 04, 2021 7:03 pm
Forum: Hardware
Topic: PiStorm
Replies: 25
Views: 828

Re: PiStorm

But believe it or not, I do agree with you that this whole thing still feels strange. In the end it would probably just use the keyboard and nothing else, with the rest being emulation. Even I am not sure I agree with that ;) On an Amiga that makes a lot of use of its many custom chips, the PiStorm...
by tofro
Mon May 03, 2021 1:55 pm
Forum: Hardware
Topic: PiStorm
Replies: 25
Views: 828

Re: PiStorm

Interesting concept, the exact contrary to, for example, the MiniMIG, that has a "real" CPU and emulates the peripherals, this emulates the CPU and keeps the original peripherals.

Nice approach to keeping the original computers alive (even if not original) and up-to-date.

And: It's cheap.