Search found 829 matches

by Peter
Mon Jun 10, 2019 9:43 pm
Forum: Compatibles Corner
Topic: Q68 I2C addresses.
Replies: 16
Views: 505

Re: Q68 I2C addresses.

To get you going, here's a quick hack for the TF Services Analogue interface. The wait(500000) in main() should of course be replaced by a non-polling delay. #include <stdio.h> #define TIME_CPU (* (volatile unsigned long*) 0x1C060) #define I2C_SCL (* (volatile unsigned char*) 0x1C1C0) #define I2C_SD...
by Peter
Mon Jun 10, 2019 9:36 pm
Forum: Compatibles Corner
Topic: Q68 I2C addresses.
Replies: 16
Views: 505

Re: Q68 I2C addresses.

Can you confirm that the 'keys_q68' include definitions file currently available in the SMSQ source is incorrect, as it has the following: [src_keys_q68, lines 115..116] i2c_scl equ $1c00c ; ? i2c_sda equ $1c00e ; ? Yes incorrect. It has historical reasons. The hardware was changed toward longword ...
by Peter
Mon Jun 10, 2019 11:07 am
Forum: Compatibles Corner
Topic: Q68 I2C addresses.
Replies: 16
Views: 505

Re: Q68 I2C addresses.

There are no timing problems with Q68 I2C, one just needs to know how to do I2C bitbanging correctly (not a Q68-specific issue). Unlike QL network, I2C has no maximum timing requirements that could be violated by the short delays caused by video burst. Using internal SRAM is not required. Sometimes ...
by Peter
Wed Jun 05, 2019 9:44 am
Forum: Hardware
Topic: Symmetric multiprocessing...
Replies: 40
Views: 1558

Re: Symmetric multiprocessing...

What if a "QL" had a main processor, then a gang of smaller processors, each allocated a few kilobytes of exclusive dual port RAM? Programs on the main processor could load programs and data into the workspace of each CPU, which could then run ongoing programs. I wonder why nobody mention...
by Peter
Wed May 22, 2019 9:38 pm
Forum: Software & Programming
Topic: New Minerva ROMs for Q68
Replies: 24
Views: 1368

Re: New Minerva ROMs for Q68

Hi Jan,
janbredenbeek wrote:In fact, I've already done that ;)

I would not have expected anything else ;)

janbredenbeek wrote:I just need to rebuild it.

Obviously, you uploaded the result already :D Works fine, thank you!
Peter
by Peter
Mon May 20, 2019 6:58 pm
Forum: General QL Chat
Topic: Internet and the QL
Replies: 38
Views: 1942

Re: Internet and the QL

I wonder if a pragmatic approach, like finding or hosting classic email servers, could help without "outsourcing" encryption to a non-native CPU. (By the way, I'm not sure that an encryption engine outside the QL would automatically lead to the development of an email client which can han...
by Peter
Mon May 20, 2019 1:09 pm
Forum: General QL Chat
Topic: Internet and the QL
Replies: 38
Views: 1942

Re: Internet and the QL

As browsing the Internet even using older PCs is now getting more and more painful, and as more and more emails contain photos, images and attachments (and most of the time, the user can’t select which emails get downloaded), I think the most useful reason for having Ethernet on a QL would be the s...
by Peter
Sun May 19, 2019 10:35 pm
Forum: General QL Chat
Topic: Internet and the QL
Replies: 38
Views: 1942

Re: Internet and the QL

A real TCP/IP card is only useful if we have access to an encryption engine. I find it exaggerated to say that TCP/IP is useless without encryption. It can still be used for LAN connections, internet connections from QL to QL, and many websites. From my experience with QLwIP I see the largest probl...
by Peter
Fri May 17, 2019 11:15 am
Forum: General QL Chat
Topic: Internet and the QL
Replies: 38
Views: 1942

Re: Internet and the QL

I don't think he plans to emulate a full ZX8302, only provide keyboard / sound from what I've read above. Serial function is to be provided by a new serial device (so that offloads responsibility of that to a new driver and DUART chip). When I asked if keyboard, sound and SER need new drivers, the ...
by Peter
Fri May 17, 2019 9:21 am
Forum: General QL Chat
Topic: Internet and the QL
Replies: 38
Views: 1942

Re: Internet and the QL

Doesn't that mean you need completely new software drivers for keyboard, sound and SER? No. It will emulate the 8302 register behavior, but with a new back-end. USB keyboards and mice. I'm getting strong comments to include a proper sound chip also. Serial will be handed off to a DUART. So really, ...