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by Derek_Stewart
Fri Jan 12, 2018 9:20 am
Forum: General QL Chat
Topic: QL 34th Anniversary new hardware.
Replies: 51
Views: 1803

Re: QL 34th Anniversary new hardware.

You know that big black heatsink behind the microdrives? The little hot component on there is the 7805, a 5 volt regulator. It's grossly inefficient, and all that wasted energy is turned into heat. A buck regulator is for practical purposes a switched, high efficiency transformer. They are much mor...
by Derek_Stewart
Thu Jan 11, 2018 9:35 am
Forum: General QL Chat
Topic: QL 34th Anniversary new hardware.
Replies: 51
Views: 1803

Re: QL 34th Anniversary new hardware.

Hi,

I would of liked a Mini Backplane, but they do no seem to be on sale.

Put me down for one of each, I can build if required.
by Derek_Stewart
Thu Jan 11, 2018 9:31 am
Forum: Software & Programming
Topic: ROMable SMSQ/E
Replies: 28
Views: 991

Re: ROMable SMSQ/E

Hi,

Sorry to throw a spanner in the works, SMSQ/E Gold only works with a Gold or Super Gold Card,

Who is going to write all this.
by Derek_Stewart
Wed Jan 10, 2018 11:05 am
Forum: Hardware
Topic: Sandy SuperQBoard HD
Replies: 4
Views: 294

Re: Sandy SuperQBoard HD

Hi Marcel, I have a SuperQBoard, like yours without the Mouse components soldered in, I was going upgrade it, along with the ROM. Maybe I could include your HD Disk upgrade. I was not sure how the Mouse connector looked on the board. All is clear now. Hi Derek, I've got 8 or so PCBs from China, I c...
by Derek_Stewart
Tue Jan 09, 2018 9:44 am
Forum: Hardware
Topic: Sandy SuperQBoard HD
Replies: 4
Views: 294

Re: Sandy SuperQBoard HD

Hi everybody, I described my quest for a HD capable Sandy SuperQBoard here: https://www.kilgus.net/2018/01/09/sandy-superqboard-now-in-hd/ Enjoy ;) (I will monitor this thread, too, in case there are comments/questions) Hi Marcel, I have a SuperQBoard, like yours without the Mouse components solder...
by Derek_Stewart
Tue Jan 09, 2018 9:40 am
Forum: Software & Programming
Topic: Q68 Powered Arcade Game
Replies: 49
Views: 2239

Re: Q68 Powered Arcade Game

Who would like to adapt this to the Q68 ? It is less than 250 ARM instructions. I had no time to practice coding in 68k assembly. My source is fully commented, and I could of course answer all questions. In about a fortnight I should be able to amend further the code to get the original parallax ef...
by Derek_Stewart
Tue Jan 09, 2018 9:20 am
Forum: Hardware
Topic: Q68 serial port
Replies: 27
Views: 1524

Re: Q68 serial port

Sorry, only asking because my Q68 is being manufactured, so I don't have one to just ask. :D Hi Dave, I am expecting new Q68 PCBs on 22/1/18, I have you noted down as first on the list due to the shipping lost. I will is either FED-EX or UPS to ship to the USA, seems to not too much more for a 3 da...
by Derek_Stewart
Tue Jan 09, 2018 9:17 am
Forum: Hardware
Topic: M.C.S Memodisk
Replies: 2
Views: 250

Re: M.C.S Memodisk

Hi Schombi,

I do not have an information of the M.C.S. Memodisk.

But I have disassembled the ROM I copied from the M.C.S. with DISA.

But I doubt this would not be what you are after.
by Derek_Stewart
Sun Jan 07, 2018 9:46 pm
Forum: Software & Programming
Topic: Machine Code Converters: 6502 to 68000
Replies: 6
Views: 399

Re: Machine Code Converters: 6502 to 68000

Hi, Many years ago in the 1990s I thought the 68000 could run 6502 assembler source code. To implement this I starting writing a macro library file for the QMAC assembler. The idea was to define the 6502 op codes with QMAC macros and 68000 assembley op codes. Since the 6502 CPU is 8 bit, the 68000 C...
by Derek_Stewart
Wed Jan 03, 2018 9:10 am
Forum: Hardware
Topic: Couple of SD suggestions.
Replies: 5
Views: 403

Re: Couple of SD suggestions.

Hi all, QLFloppySD is a card I designed it's basically a merger of a TrumpCard but implemented with static RAM and a CPLD but otherwise funtionally identical. Also onboard it has anothe CPLD that implements a slightly changed version* of the code from the original. Compared to the ones Rich listed,...

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