Search found 1505 matches

by tofro
Thu Mar 21, 2019 1:43 pm
Forum: General QL Chat
Topic: Why the QL ?
Replies: 14
Views: 366

Re: Why the QL ?

The Ql was probably the first home computer to feature a "real" operating system in the basic configuration. All other computers I had before were like the Spectrum or C64, implementing basic functionality to run the BASIC interpreter, and then collected commonly usable subroutines that co...
by tofro
Wed Mar 20, 2019 6:04 pm
Forum: General QL Chat
Topic: First power up
Replies: 7
Views: 230

Re: First power up

Put it in a dry and warm place for a week, then simply power it on. (At least if it doesn't rattle when shaken) If it works after the first 10 seconds, fine (it probably won't completely work). If it doesn't, quickly switch it off, then come back to us for tips on repair. There are computers out the...
by tofro
Mon Mar 18, 2019 4:10 pm
Forum: Hardware
Topic: SGC successor brainstorming
Replies: 89
Views: 7294

Re: SGC successor brainstorming

That experience is mainly based on old Amigas, Ataris and Macs older than 20 years .

I never owned a PC long enough to have the battery leak - They're just not worth to be kept that long. ;)

Tobias
by tofro
Mon Mar 18, 2019 8:52 am
Forum: Hardware
Topic: SGC successor brainstorming
Replies: 89
Views: 7294

Re: SGC successor brainstorming

My experience with rechargeables to keep the RTC alive in retro computers is mixed:

I'd rather have a clock that loses time every now and then than a battery that potentially destroys the PCB by leaking when not used for half a year.

That was probably an obvious note.

Tobias
by tofro
Sat Mar 16, 2019 11:22 am
Forum: Software & Programming
Topic: ql superbomber and m-crunch ..and more things
Replies: 71
Views: 3504

Re: ql superbomber and m-crunch ..and more things

I'm pretty sure SGC DRAM refresh should work differently - I'd guess there are no /DS pulses as well when the CPU is running code from the instruction cache.

Tobias
by tofro
Sat Mar 16, 2019 11:10 am
Forum: Software & Programming
Topic: Flashing pixels in 8 color mode
Replies: 6
Views: 190

Re: Flashing pixels in 8 color mode

Interesting.

Q-Emulator flashes the first few pixels nicely here with the example I provided on my Mac with Parallels and Windows 7, regardless of window or fullscreen mode. This is sometimes caused by Windows screen drivers that mess up Aqua mode.

Tobias
by tofro
Sat Mar 16, 2019 8:28 am
Forum: Software & Programming
Topic: Flashing pixels in 8 color mode
Replies: 6
Views: 190

Re: Flashing pixels in 8 color mode

Keith, flashing pixels is actually a hardware function on the real QL - When the flash bits are set, the pixels will start to flash in 50Hz intervals driven by the hardware. The flash bits are, other than any other screen bits on the QL, a sort of serial attribute - You only set them at the beginnin...
by tofro
Thu Mar 14, 2019 1:47 pm
Forum: Help for New Users
Topic: External Microdrives work on QL
Replies: 8
Views: 305

Re: External Microdrives work on QL

The later ZX Microdrives worked pretty well on a QL, you could format, read and write without any problems.

The main reasons why you want to connect them today are:

  • Because you can ;)
  • It just looks so odd you simply have to

Tobias
by tofro
Wed Mar 13, 2019 10:19 am
Forum: Software & Programming
Topic: ql superbomber and m-crunch ..and more things
Replies: 71
Views: 3504

Re: ql superbomber and m-crunch ..and more things

Martin, the STOP $2000 instruction simply waits for an (any, interrupt mask is 0) interrupt. The next one would most likely be the 50Hz VBL or polling interrupt. This technique can be used to synchronize the game flow with the external interrupt - And it is basically the only way to do that on a QL....
by tofro
Wed Mar 13, 2019 9:11 am
Forum: Hardware
Topic: Two peripherals attached to Q68 fried at the same time. Coincidence ?
Replies: 9
Views: 454

Re: Two peripherals attached to Q68 fried at the same time. Coincidence ?

Even if it might sound a bit silly: A lab PSU is maybe not the most suitable thing to power a computer. Set to "Constant Voltage", these PSUs are built to maintain the output voltage regardless of what current you draw from them - they will just push in copious amounts of energy to maintai...

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