Search found 841 matches

by Peter
Mon Jun 24, 2019 9:42 am
Forum: Hardware
Topic: Aurora
Replies: 4
Views: 119

Re: Aurora

I agree with Dave that outside the original QL case, technical reasons for Aurora+(S)GC are hard to find. Still Aurora has a nostalgia value! Also, for fairness, it should be added there is no Q68 matrix keyboard adaptor yet. This is where the Aurora has an advantage: It can be used inside the origi...
by Peter
Sun Jun 23, 2019 9:39 pm
Forum: Compatibles Corner
Topic: Q68 serial buffers
Replies: 10
Views: 271

Re: Q68 serial buffers

It's important to distinguish mass storage driver issues and SER. The SMSQ/E mass storage driver can get painfully slow during write, and blocks everything else. This affects ethernet as well - software buffers can't help reliably because no interrupts are handled meanwhile. Trying with Ramdisk inst...
by Peter
Sat Jun 22, 2019 7:02 pm
Forum: Compatibles Corner
Topic: Q68 serial buffers
Replies: 10
Views: 271

Re: Q68 serial buffers

janbredenbeek wrote:So I'm wondering what the size of the Q68's input buffer is under SMSQ/E.

The hardware buffer size is 16 Bytes. SMSQ/E I don't know.
by Peter
Fri Jun 21, 2019 10:25 pm
Forum: Hardware
Topic: Q68 Case - New Design
Replies: 1
Views: 108

Re: Q68 Case - New Design

I'm adding my frontpanel and backpanel CAD designs here, maybe they are useful. The files are "Target 3001" format. PDFs also added. I keep my copyright on the designs. Re-use and modifications are welcome, under the condition the design result is contributed back to the community. Commerc...
by Peter
Thu Jun 20, 2019 11:28 am
Forum: Software & Programming
Topic: Announcing availability of a QLNET driver for the Q68 (ND-Q68)
Replies: 45
Views: 1381

Re: Announcing availability of a QLNET driver for the Q68 (ND-Q68)

Is there a problem having the three lines (3.3V, Ground and NET signal) 10 cm long ? As the length of NET cable between machines can be quite long, I don't see any issue, but I am no expert. Ideally, you would keep the series resistor & clamp diode close to the Q68 PCB and use a GND-shielded ca...
by Peter
Wed Jun 19, 2019 9:38 am
Forum: Hardware
Topic: Symmetric multiprocessing...
Replies: 52
Views: 2214

Re: Symmetric multiprocessing...

Do we find a way to fix the OS, or do we throw hardware at the problem to make it go away? Given the software situation, I tend to say let's throw hardware. But in my examples, higher singlecore performance/throughput is needed. Multiprocessing, which is technologically easier to achieve, can't hel...
by Peter
Wed Jun 19, 2019 8:58 am
Forum: Software & Programming
Topic: Announcing availability of a QLNET driver for the Q68 (ND-Q68)
Replies: 45
Views: 1381

Re: Announcing availability of a QLNET driver for the Q68 (ND-Q68)

Weren't there plans for an alternative Q68 case? Maybe this is the right time to go for it! ;)

I'll probably probably place the jack sockets at the side of the case, as I don't like network on the front panel.
But that's individual tinkering, not a recommendation.
by Peter
Tue Jun 18, 2019 4:12 pm
Forum: Software & Programming
Topic: Announcing availability of a QLNET driver for the Q68 (ND-Q68)
Replies: 45
Views: 1381

Re: Announcing availability of a QLNET driver for the Q68 (ND-Q68)

Unfortunately, this does not seem to work. When the low voltage side (Q68 FPGA) device transmits a high level (3.3V), the MOSFET is tied high (off). The 10K pullup on the high voltage side is then not suffient to drive the network line. The 0.8 V (typ.) to 1.4 V (max.) loss over the Drain–Source Dio...
by Peter
Tue Jun 18, 2019 10:21 am
Forum: Hardware
Topic: Symmetric multiprocessing...
Replies: 52
Views: 2214

Re: Symmetric multiprocessing...

⋅ Each CPU should be considered a "separate QL", running its own, dedicated OS (e.g. a modified Minerva) ⋅ The data exchange to the host QL should be done using a device driver working along the lines of the QLNET driver (just using a different physical connection thro...
by Peter
Mon Jun 17, 2019 11:47 pm
Forum: Software & Programming
Topic: Announcing availability of a QLNET driver for the Q68 (ND-Q68)
Replies: 45
Views: 1381

Re: Announcing availability of a QLNET driver for the Q68 (ND-Q68)

Its behavior is correct when the Q68 is powered, but if there is traffic on QLNET when the Q68 is unpowered, signal will still be passed to the FPGA regardless The FPGA is protected by the Schottky diode, so no danger for it. plus try to power the Q68 through the diode. An active network line would...