Search found 333 matches

by Peter
Wed Oct 11, 2017 1:52 pm
Forum: Hardware
Topic: What features matter to you?
Replies: 20
Views: 1769

Re: What features matter to you?

I am keeping the membrane connectors - or at least the positions for them as I cannot find suitable connectors at a sensible price. If I can source some economically, I'll buy a large load and distribute some to Rich so they're available for repairs for a good time to come. Can you even source them...
by Peter
Wed Oct 11, 2017 12:32 pm
Forum: Hardware
Topic: QL upgrade versus Q68
Replies: 67
Views: 5462

Re: QL upgrade versus Q68

Looks like a suitable chip, 3.3V supply but 5V tolerant. It can easily be configured to have 8 outputs and 8 inputs. It would allow the Q68 to remain I2C master, no hardware change there. The only issue would be the driver. A QL-side board would only require this cheap chip, 8 diodes, 10 resistors, ...
by Peter
Wed Oct 11, 2017 8:45 am
Forum: Hardware
Topic: QL upgrade versus Q68
Replies: 67
Views: 5462

Re: QL upgrade versus Q68

I am currently working with someone on a general purpose PIC that can use any HID USB mound and keyboard and convert them to differential mouse and 8 pin byte of keypress plus shift/tab/alt/etc for general purpose use on embedded designs... They're a retro Commodore person, so it will be mainly aim...
by Peter
Tue Oct 10, 2017 10:18 am
Forum: Hardware
Topic: QL upgrade versus Q68
Replies: 67
Views: 5462

Re: QL upgrade versus Q68

tofro wrote:That's what I'm saying, Peter:

QL keyboard matrix to PS/2 shouldn't be too difficult to implement for the average µC tinkerer.

Tobias


XorA wrote:Just needs a i2c GPIO expander chip and a native driver. No uC required at all!

G


Do you have a recommendation for a suitable chip?

Peter
by Peter
Fri Oct 06, 2017 9:08 am
Forum: Hardware
Topic: Q68 Advance Notice
Replies: 68
Views: 4199

Re: Q68 Advance Notice

No, the hardware is not identical to Q40/Q60, as the 20 kHz interrupt overhead would slow down a 68000-style CPU considerably. The Q68 includes a hardware FIFO, so the samples can be transferred by the OS in larger chunks. It is sufficient to transfer the samples with the frame interrupt. If more de...
by Peter
Fri Sep 29, 2017 10:24 am
Forum: Hardware
Topic: Q68 Advance Notice 3 - Release date
Replies: 16
Views: 1060

Re: Q68 Advance Notice 3 - Release date

Yes, Derek is in hospital, not me. He had problems with the WiFi connection there, that's why I was posting the info.
by Peter
Thu Sep 28, 2017 6:29 pm
Forum: Hardware
Topic: Q68 Advance Notice 3 - Release date
Replies: 16
Views: 1060

Q68 Advance Notice 3 - Release date

By a hospital stay, the public release of the Q68 board will probably be delayed by several weeks. Derek asked me to inform that the new estimated release date is 6th of November. On the positive side, this allows me to "polish" one or two features, do more testing, and write a little docu...
by Peter
Wed Sep 27, 2017 3:48 pm
Forum: Hardware
Topic: QL ROM switcher
Replies: 15
Views: 807

Re: QL ROM switcher

Sorry to be a bit negative, but I don't get it. I see it of very limited use, it could easily be so much more. As soon as someone actually creates a piece of QL hardware, ideas come up what else could "easily" have been added. :) Then why not "easily" design it youself? ;) From ...
by Peter
Wed Sep 27, 2017 8:19 am
Forum: Hardware
Topic: Q68 Advance Notice 2 - Pricing
Replies: 34
Views: 2131

Re: Q68 Advance Notice 2 - Pricing

Power supply: Yes these are standard 5V devices with 2.1 mm coaxial connector. I think Derek will comment on this after his return. Q68 execution speed from "fast RAM" region: Simple register to register instructions like ADD oder MOVE take 1 cycle, i.e. 25 ns Please note there is no offic...
by Peter
Tue Sep 26, 2017 9:11 pm
Forum: Hardware
Topic: Q68 Advance Notice 2 - Pricing
Replies: 34
Views: 2131

Re: Q68 Advance Notice 2 - Pricing

Thanks. By the way, if only short routines need speedup, there is a 12 KB area of fast RAM at $19000 ... $1BFFF. Code executed in that area usually runs several times faster and is not affected by video access. At the moment, SMSQ/E uses only a small portion of the fast RAM, maybe the rest can be ma...

Go to advanced search