Search found 409 matches

by Peter
Sun Dec 10, 2017 10:20 pm
Forum: Hardware
Topic: Hardware of the Q68 and programming examples
Replies: 1
Views: 113

Re: Hardware of the Q68 and programming examples

1/ Q68 uses an FPGA. What is necessary to reprogram it ? A Lattice JTAG adaptor is required. The FPGA is not meant to be reprogrammed by the user. 2/ Bank switching / video DMA ? How is bank switching achieved (in ASM, directly accessing the hardware please, not with OS call). There is no bank swit...
by Peter
Sun Dec 10, 2017 10:03 pm
Forum: Software & Programming
Topic: Q68 Powered Arcade Game
Replies: 26
Views: 1045

Re: Q68 Powered Arcade Game

I don't get it, about video DMA. I thought you were inquiring a programmable DMA controller. Of course, data is read from SDRAM by the video controller. Slightly amending the VHDL code to make this video DMA address writable would be a very interesting feature. It is not VHDL, but schematics and Ve...
by Peter
Sun Dec 10, 2017 9:32 am
Forum: Software & Programming
Topic: Q68 Powered Arcade Game
Replies: 26
Views: 1045

Re: Q68 Powered Arcade Game

What does the Q68 offers to set the address of the video DMA ? The Q68 has no DMA. Also : are the size of the borders programmable ? There is no overall border, the full screen size is used. You can use windows if you want a border, see QDOS and SMSQ/E manuals. A list and description of all hardwar...
by Peter
Sat Dec 09, 2017 8:53 pm
Forum: Software & Programming
Topic: Fast plotting (and unplotting) sprites / Q68
Replies: 18
Views: 617

Re: Fast plotting (and unplotting) sprites / Q68

Zarchos wrote:When I read that I can tell you definitively we'll need fast plotting and unplotting routines for the Q68, to get great and fast arcade games.

My point is getting an arcade game at all, which has not happened for 20 years. Fast routines, but no game would be of little interest for me.
by Peter
Fri Dec 08, 2017 9:44 pm
Forum: Software & Programming
Topic: Fast plotting (and unplotting) sprites / Q68
Replies: 18
Views: 617

Re: Fast plotting (and unplotting) sprites / Q68

CPU access to the normal SDRAM memory is not particularly fast, as it is random access. You can expect about 100 ns per 16-bit word. (No CPU cache, therefore burst access only for video.)
by Peter
Fri Dec 08, 2017 2:26 pm
Forum: Software & Programming
Topic: Fast plotting (and unplotting) sprites / Q68
Replies: 18
Views: 617

Re: Fast plotting (and unplotting) sprites / Q68

I have only provided a few examples and basic infos. Maybe you can search the forum and save me from repeating. I have no comprehensive list of timings, and it depends on memory as well as on CPU. The QL doesn't have such info either. Unlike the QL, the Q68 has a good tool for measuring. -> Zarchos:...
by Peter
Fri Dec 08, 2017 12:34 pm
Forum: Software & Programming
Topic: Fast plotting (and unplotting) sprites / Q68
Replies: 18
Views: 617

Re: Fast plotting (and unplotting) sprites / Q68

My interest would be to see a new arcade game at all. As far I can remember, this has not happened for the QL in about 20 years. The original QL was already fast enough for arcade games. So a machine which is roughly 20 times faster (Q-Top benchmark) does not technically need highly optimized sprite...
by Peter
Thu Dec 07, 2017 10:32 am
Forum: Hardware
Topic: Q68 New users and general usage thread
Replies: 21
Views: 742

Re: Q68 New users and general usage thread

This was my first experience of a rock solid display for the first time on a non-emulated QL - gorgeous! I'm glad about this feedback, because trying to work out the best compromise for video was a lot of work. There is such a large range between CRT monitors and the latest HDMI widescreens - and s...
by Peter
Wed Dec 06, 2017 1:16 pm
Forum: Hardware
Topic: Q68 New users and general usage thread
Replies: 21
Views: 742

Re: Q68 New users and general usage thread

Would be intersting if it runs without image file, either directly, with FLP_USE, or the SUB extension.
by Peter
Wed Dec 06, 2017 12:42 pm
Forum: Hardware
Topic: Discussion about connecting RASPI to QL
Replies: 58
Views: 4635

Re: Discussion about connecting RASPI to QL

is none here monitoring how the next project is going? surely this has a influence on the future of the QL ? Probably 1/4 of the forum are, and waiting to see whether Q68 or Next lands in their mailbox next week first! :-D Just for the history records: The first cased Q68 arrived one or two days be...

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