Search found 136 matches

by Pr0f
Thu Jan 18, 2018 2:50 pm
Forum: Software & Programming
Topic: Drivers and linking...
Replies: 4
Views: 107

Re: Drivers and linking...

Yes - I came across some code that you can include in the ROM init code to make the ROM scanning work again for those ROM versions where it didn't. So from what you say, if I have a replacement driver, and another vendor has a replacement driver, I would want mine to be in the last scanned ROM to be...
by Pr0f
Thu Jan 18, 2018 11:31 am
Forum: Software & Programming
Topic: Drivers and linking...
Replies: 4
Views: 107

Re: Drivers and linking...

I should probably reword that to any add on ROM's - as the 'internal' definitions are also in a ROM :-)
by Pr0f
Thu Jan 18, 2018 11:30 am
Forum: Software & Programming
Topic: Drivers and linking...
Replies: 4
Views: 107

Drivers and linking...

It's my understanding that any drivers that are loaded by ROM code are linked in ahead of the internal ones, allowing these to be replaced. In the event that driver replacement code exists in more than one ROM, which has the priority - the one found first in the ROM scanning, or the last one scanned ?
by Pr0f
Mon Jan 15, 2018 1:59 pm
Forum: Compatibles Corner
Topic: a DIY home build project...
Replies: 37
Views: 1652

Re: a DIY home build project...

There is code available for download to the propeller that emulates ay8910, Commodore SID chip and a WAV player, so more interesting sound options are there, a driver would be required to push the data down to the propeller, but using an 8 bit fast serial link running at 1M, you can shift a lot of d...
by Pr0f
Fri Jan 12, 2018 7:22 am
Forum: General QL Chat
Topic: Why did Sinclair hate National Semiconductor?
Replies: 5
Views: 351

Re: Why did Sinclair hate National Semiconductor?

I wonder if it was a loading issue, or maybe slew rate ?

Without comparing the data sheets for NAT semi and maybe TI or whoever else also made the LS series of logic, it's hard to say.
by Pr0f
Thu Jan 11, 2018 9:04 pm
Forum: Compatibles Corner
Topic: a DIY home build project...
Replies: 37
Views: 1652

Re: a DIY home build project...

This is the one: https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjYtKnP5dDYAhUJIcAKHXcCCfoQFggoMAA&url=https%3A%2F%2Fwww.nxp.com%2Fdocs%2Fen%2Fdata-sheet%2FSC26C92.pdf&usg=AOvVaw1vCoiVRHgau38D-llqEBoh It has some dis...
by Pr0f
Thu Jan 11, 2018 11:34 am
Forum: Compatibles Corner
Topic: a DIY home build project...
Replies: 37
Views: 1652

Re: a DIY home build project...

I am using a 68901, which could and probably will.eventually go in the fpga with video, the reason for using the separate chip to start with is ease of testing. This acts as interrupt controller for the QL, totally replacing the zx8302. It has a serial controller on board, 4 timers, and 8 programmab...
by Pr0f
Thu Jan 11, 2018 11:20 am
Forum: Software & Programming
Topic: ROMable SMSQ/E
Replies: 28
Views: 1017

Re: ROMable SMSQ/E

Something could emulate a gold card or super gold card, then in theory that version of SMSQ/E should work.

It's purely speculation.
by Pr0f
Thu Jan 11, 2018 11:15 am
Forum: General QL Chat
Topic: QL 34th Anniversary new hardware.
Replies: 51
Views: 1909

Re: QL 34th Anniversary new hardware.

Happy birthday Dave, and a Minerva carrier might be useful... I will order on the 14th Feb
by Pr0f
Wed Jan 10, 2018 9:51 pm
Forum: Software & Programming
Topic: ROMable SMSQ/E
Replies: 28
Views: 1017

Re: ROMable SMSQ/E

you say it wastes either ROM or RAM, but it's probably cheaper - if you are going to implement a large amount of RAM in a system it will probably be DRAM on a simm, and if its on a 68020 or better processor - it will be 32 bits wide - such RAM is relatively cheap and reasonably fast. ROM isn't cheap...

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