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by Peter
Thu Apr 27, 2017 8:52 pm
Forum: Hardware
Topic: Random hardware ideas!
Replies: 43
Views: 1536

Re: Random hardware ideas!

From Dave not adding Flash, in order to do that on the "Super Duper Gold Card", I concluded the recently discussed card was not the "Super Duper Gold Card". And I was assuming the 680>=20 CPU card and the "Super Duper Gold Card" mean roughly the same. Both might be wron...
by Peter
Thu Apr 27, 2017 8:13 pm
Forum: Hardware
Topic: Random hardware ideas!
Replies: 43
Views: 1536

Re: Random hardware ideas!

SSS should be reasonably simple in case you have sufficient CPLD capacity and pins. It consists of an 8-bit port, an R2R ladder, a timer and an interrupt, maybe an OpAmp or a transistor in the simplest case. The reason why it was so easy on Q40/Q60 came from the fast CPU speed, which (A) allowed fe...
by Peter
Thu Apr 27, 2017 7:35 pm
Forum: Hardware
Topic: Random hardware ideas!
Replies: 43
Views: 1536

Re: Random hardware ideas!

Will (Flash) EPROM be there? No. I'll have to save working on that for the Super Duper Gold Card* But that would make the card dependant on loading the SDHC drivers from microdrive! Or dependant on a second extension card for mass storage with feed-through QL bus. I would at least add a cheap littl...
by Peter
Thu Apr 27, 2017 12:54 pm
Forum: Hardware
Topic: Random hardware ideas!
Replies: 43
Views: 1536

Re: Random hardware ideas!

Maybe the lefthand side of the case should be similarly long to provide room for some extensions cards. :P
I still remember seeing QLs with a half meter of hardware on the left...
by Peter
Thu Apr 27, 2017 9:47 am
Forum: Hardware
Topic: Random hardware ideas!
Replies: 43
Views: 1536

Re: Random hardware ideas!

Will (Flash) EPROM be there? As for the 'non-existent' ethernet driver, and 'easy' USB HID driver: The former has at least an existing, tested hardware to be developed on. Not sure about the 'big' potential benefit of USB mouse and keyboard. For a keyboard or 3 button mouse with scrollwheel: What do...
by Peter
Wed Apr 26, 2017 9:25 am
Forum: Hardware
Topic: Random hardware ideas!
Replies: 43
Views: 1536

Re: Random hardware ideas!

Silvester wrote:Whereas DS1374C uses I2C link, with bonus of integrated crystal and charger, making it much simpler. Downside, only appears to be available from recognised suppliers (for the price of P/P I could buy several MM58724C off ebay).

There is a cheaper version for external crystal, the DS1374U.
by Peter
Tue Apr 25, 2017 11:18 pm
Forum: Hardware
Topic: Q68 compatible peripherals on other QL systems
Replies: 14
Views: 535

Re: Q68 compatible peripherals on other QL systems

The proposed area is 2KB inside the 16 KB QL "External I/O" area. I'm not aware of any wellknown device using this, but I'm requesting feedback here, in case someone can see a conflict. Yes the CP2200 could easily be added to Q40/Q60 via the ISA bus. They already support existing ISA ether...
by Peter
Tue Apr 25, 2017 10:27 pm
Forum: Hardware
Topic: Q68 compatible peripherals on other QL systems
Replies: 14
Views: 535

Re: Q68 compatible peripherals on other QL systems

That could complicate things. No, it would just waste a little address space. But then 32 Bit data bus CPUs like 68040/68060 which don't have dynamic bus sizing could use the same driver. Wouldn't it provide access only to the top byte in each long word? Correct. But the driver software knows that ...
by Peter
Tue Apr 25, 2017 9:41 pm
Forum: Hardware
Topic: Q68 compatible peripherals on other QL systems
Replies: 14
Views: 535

Re: Q68 compatible peripherals on other QL systems

A0:8 are brought through to the expansion connector. That is 512 bytes address range. $1D000 - $1D800 and $1D800 - $1DFFF are 2048 bytes each. That is to allow enough range for 4 Byte alignment (in that case, the external A0:8 would be A2:10 on CPU side). I was requesting comment on the alignment i...
by Peter
Tue Apr 25, 2017 9:33 pm
Forum: Hardware
Topic: Q68 compatible peripherals on other QL systems
Replies: 14
Views: 535

Re: Q68 compatible peripherals on other QL systems

Dave wrote:What will be the ROM address for the ethernet?

No ROM for the driver, network software would be loaded from file.
Please note that the Q68 will come without any promise for network software support. Ethernet is just tested hardware-wise.
The rest is hobby.

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