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Author Topic: Enterprise MIDI hardware (Read 7267 times)

Offline gflorez

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Re: Enterprise MIDI hardware
« Reply #60 on: 2019.March.13. 20:14:05 »
Now that we are near completion, I want to try the external cartridge bay that Zozo sugested. But I need some schematics.

Offline pear

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Re: Enterprise MIDI hardware
« Reply #61 on: 2019.March.14. 05:59:30 »
Exactly.
Should I make a copy of the interface in the cardridge version or it immediately change ?
If the second option, then what standard ?
Standalone (directly to the edge connector), under the BUS board (original or new), or COMBO with the option of choosing which connector to assembly and connect to what ?

Offline pear

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Re: Enterprise MIDI hardware
« Reply #62 on: 2019.March.15. 05:55:14 »
Can you check if it is correct ?
And how ?
Is fine ?
Or I need to correct something in the schematic ?

Offline Zozosoft

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Re: Enterprise MIDI hardware
« Reply #63 on: 2019.March.15. 15:11:28 »
I'll try to finish checking at the weekend.

Should I make a copy of the interface in the cardridge version or it immediately change ?
I think cartridge version isn't needed, most users use SD at the cartridge side.

Quote
or COMBO with the option of choosing which connector to assembly and connect to what ?
I think the COMBO version will be the best.
« Last Edit: 2019.March.15. 22:33:44 by szipucsu »

Offline Zozosoft

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Re: Enterprise MIDI hardware
« Reply #64 on: 2019.March.15. 16:27:12 »
Now that we are near completion, I want to try the external cartridge bay that Zozo sugested. But I need some schematics.
2x 74ALS138
1x 74LS32

First 74LAS138:
/E0 and /E1: /MREQ
E2: /RFSH
A0: A19
A1: A20
A2: A21
The 8 outputs are valid for 8x512K memory areas:
/Q0: 00H-1FH
/Q1: 20H-3FH
/Q2: 40H-5FH
/Q3: 60H-7FH
/Q4: 80H-1FH
/Q5: A0H-BFH
/Q6: C0H-DFH
/Q7: E0H-FFH

With the second 74ALS138 divide one 512K are for a 64K areas:
/E0 and /E1: /Qx from first 74ALS138
E2: +5V
A0: A16
A1: A17
A2: A18

If using /Q0: 00H-1FH from first 138, then the outputs of the second:
/Q0: 00H-03H
/Q1: 04H-07H
/Q2: 08H-0BH
/Q3: 0CH-0FH
/Q4: 10H-13H
/Q5: 14H-17H
/Q6: 18H-1BH
/Q7: 1CH-1FH

The selected output will be the new /CART signal. Using Q0 from the first, and Q2 from the second, then the new external cartridge will be at 08H-0BH, next to the original.
One gate from the 74LS32 make the /CART&RD signal.

Also need a 7805 (or compatible) or a +5V from bus card.

Offline gflorez

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Re: Enterprise MIDI hardware
« Reply #65 on: 2019.March.15. 16:33:44 »
Ok thanks. I will study it and more questions will follow, for sure....
« Last Edit: 2019.March.15. 22:01:26 by gflorez »

Offline Zozosoft

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Re: Enterprise MIDI hardware
« Reply #66 on: 2019.March.16. 21:22:00 »
Final, reverse engineering schematic.
Can you check if it is correct ?
All correct! :smt038

Offline gflorez

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Re: Enterprise MIDI hardware
« Reply #67 on: 2019.March.17. 15:15:19 »
Similar decoding is made inside DAVE:

23082-0

I understand that /ROM is no more necessary, with your modified EXOS a ROM can exist on any 16kb boundary(Segment).
« Last Edit: 2019.March.17. 15:43:44 by gflorez »

Offline pear

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Re: Enterprise MIDI hardware
« Reply #68 on: 2019.March.17. 17:45:25 »
Initial visualization.
COMBO connector with the option of mounting elements for connection in a standard BusBridge or without it, or via BusExpander or FlexiBridge.
Possibility to select a jumper of the standard cardridge segment (04-07) or the next (08-0B).
It is possible to choose ROM 27128 or 27256.
Jumper for connecting the IRQ signal from the ACIA to the INT input of the CPU.

Offline gflorez

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Re: Enterprise MIDI hardware
« Reply #69 on: 2019.March.17. 19:05:02 »
Wonderful!

I like your multi-connection options.

Offline pear

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Re: Enterprise MIDI hardware
« Reply #70 on: 2019.March.23. 13:34:48 »
I think is ready for production.

Offline gflorez

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Re: Enterprise MIDI hardware
« Reply #71 on: 2019.March.23. 15:17:08 »
Of course, I want one.

Now we need somebody polish the program in Rom.

Offline szipucsu

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Re: Enterprise MIDI hardware
« Reply #72 on: 2019.March.23. 15:26:15 »
I think is ready for production.
It seems awesome! What can it do? Have you tried it out? How does it work?
Can you plug a midi keyboard and play using midiplay or mididisp utilities?
SOUND SOURCE 3,STYLE 16,LEFT 16,RIGHT 64,SYNC 2
SOUND SOURCE 2,STYLE 128,PITCH 25.2,SYNC 2
SOUND PITCH 25,SYNC 2
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Offline pear

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Re: Enterprise MIDI hardware
« Reply #73 on: 2019.March.23. 15:56:55 »
Unfortunately, I do not have any instrument or MIDI keyboard for testing.
For a moment I thought about buying, but these are things that take up a lot of space, and I'm not a musician (my level of music - music does not bother me :ds_icon_cheesygrin: ).
I will test the finished circuit on the oscilloscope, and then I will ask someone who has the musical equipment for help.

Offline szipucsu

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Re: Enterprise MIDI hardware
« Reply #74 on: 2019.March.23. 16:33:12 »
I'm not a musician
However, I suggest you use this T-shirt after finishing the midi hardware:

SOUND SOURCE 3,STYLE 16,LEFT 16,RIGHT 64,SYNC 2
SOUND SOURCE 2,STYLE 128,PITCH 25.2,SYNC 2
SOUND PITCH 25,SYNC 2
Videos