Search found 1341 matches

by Peter
Fri Sep 10, 2021 9:58 am
Forum: Hardware
Topic: Expanding the QL's address space beyond 1M (+primer on building QL compatible machines)
Replies: 38
Views: 1695

Re: Expanding the QL's address space beyond 1M (+primer on building QL compatible machines)

The 16550 was an 'improvement' which actually had a set of it's own problems but the main star of the show was a 16-byte receive and transmit FIFO. That's mildly put. If I remember correctly, the 16550 was so buggy that the FIFO could not be used at all. National Semiconductor later released the 16...
by Peter
Fri Sep 10, 2021 9:23 am
Forum: Hardware
Topic: Expanding the QL's address space beyond 1M (+primer on building QL compatible machines)
Replies: 38
Views: 1695

Re: Expanding the QL's address space beyond 1M (+primer on building QL compatible machines)

The idea that the designers probably had in mind was to use SER1 to drive the printer and SER2 for modems or other communication. And that wasn't too much of a bad idea when the QL was designed. It appears to me that one parallel port instead of the second serial was a much better idea, even at des...
by Peter
Fri Sep 10, 2021 9:02 am
Forum: General QL Chat
Topic: QXL.WIN (the domain name).
Replies: 25
Views: 948

Re: QXL.WIN (the domain name).

I also think it wouldn't be good to leave the QL/GC/SGC hardware behind - making it even more complicated to distinguish the requirements.
Worth considering might be a default check for fragmentation at every driver startup or card change, if it does not consume too much time.
by Peter
Thu Sep 09, 2021 9:24 am
Forum: General QL Chat
Topic: QXL.WIN (the domain name).
Replies: 25
Views: 948

Re: QXL.WIN (the domain name).

Not sure about that, as significant speed optimization was achieved by multisector operations.
by Peter
Wed Sep 08, 2021 11:45 pm
Forum: General QL Chat
Topic: QXL.WIN (the domain name).
Replies: 25
Views: 948

Re: QXL.WIN (the domain name).

mk79 wrote:Qx0 and Q68 could in theory also work with fragmented containers, but a) nobody has written the code for it and b) it would consume double the memory.

And c) it would be slower.
by Peter
Wed Sep 08, 2021 11:16 pm
Forum: General QL Chat
Topic: QXL.WIN (the domain name).
Replies: 25
Views: 948

Re: QXL.WIN (the domain name).

All are QLWA filesystems inside a container file. But native hardware has the extra requirement of unfragmented containers, which the emulators have not.
by Peter
Wed Sep 08, 2021 12:16 pm
Forum: General QL Chat
Topic: QXL.WIN (the domain name).
Replies: 25
Views: 948

Re: QXL.WIN (the domain name).

http://QXL.WIN Nice site and PDF intro! I haven't understood, why TT had not put the QXL.WIN container onto Atari, it is a nearly crash-proof way to store files. Actually Tony Tebby did bring nicely working QLWA to Atari formatted harddisks! But he did that for Q40/Q60 - where there was not so much...
by Peter
Mon Aug 23, 2021 8:22 am
Forum: Hardware
Topic: Q68 Order Process
Replies: 215
Views: 55571

Re: Q68 Order Process

NetBSD also supports the Sun-2 with 68010 CPU and Sun MMU: http://wiki.netbsd.org/ports/sun2/
by Peter
Sat Aug 14, 2021 11:47 am
Forum: The Off-Topic Section
Topic: If Clive Sinclai had done ....
Replies: 3
Views: 331

Re: If Clive Sinclai had done ....

He could have put a full 68000 into the QL, but didn't because they were ceramic only at the time, and costly. He used a cheap 68008 instead. Saved money, saved on data lines on the bus. Ironically, both DRAMs and ROMs came in double 8 bit banks, so 16 bit data was almost there anyway! If Richard A...