Connect AY-3-8910 sound chip to FME-7 board
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Re: Connect AY-3-8910 sound chip to FME-7 board
It's around 20$ in japan at cybergadget:
I may buy one someday but for some reason they sell it at an exorbitant price on amazon.jp so I don't know if it's means it's discontinued or not.
I may buy one someday but for some reason they sell it at an exorbitant price on amazon.jp so I don't know if it's means it's discontinued or not.
Re: Connect AY-3-8910 sound chip to FME-7 board
I like it, it looks very nice. It is nice that it is keyed on both sides so nothing can go backwards. I have put a cart in backwards once by accident. Amazingly nothing broke.Banshaku wrote:It's around 20$ in japan at cybergadget:
I may buy one someday but for some reason they sell it at an exorbitant price on amazon.jp so I don't know if it's means it's discontinued or not.
Re: Connect AY-3-8910 sound chip to FME-7 board
I have a question about the circuit.
Why connect PRG A14 and PRG A13 to 74'139 and AY-3-8910, rather than CPU A14 and CPU A13? We are trying to decode CPU memory region $C000~$FFFF, not PRG, aren't we?
Connecting PRG /CE rather than CPU /ROMSEL to 74'139 is also confusing me.
I found that what we are trying to do is quite similar with PRG RAM circuit. The sole difference is the address region. Am I correct?
Why connect PRG A14 and PRG A13 to 74'139 and AY-3-8910, rather than CPU A14 and CPU A13? We are trying to decode CPU memory region $C000~$FFFF, not PRG, aren't we?
Connecting PRG /CE rather than CPU /ROMSEL to 74'139 is also confusing me.
I found that what we are trying to do is quite similar with PRG RAM circuit. The sole difference is the address region. Am I correct?
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Re: Connect AY-3-8910 sound chip to FME-7 board
It is CPU, not PRG, as you correctly think.
Re: Connect AY-3-8910 sound chip to FME-7 board
So this is the "not so confusing" circuit, right?krzysiobal wrote:It is CPU, not PRG, as you correctly think.
Code: Select all
74'139
-----v-----
GND-|/1E VCC|-+5V
139./2Y1-|1A /2E|-CPU /ROMSEL
139./2Y1-|1B 2A|-CPU A14
-|/1Y0 2B|-CPU R/W
-|/1Y1 /2Y0|-
-|/1Y2 /2Y1|-139.1A
AY.BDIR-|/1Y3 /2Y2|-
GND-|GND /2Y3|-
-----------
AY-3-8910
----v----
. |
. |
. |
BC1|-GND
BC2|-CPU A13
BDIR|-139./1Y3
. |
. |
. |
---------
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- Posts: 827
- Joined: Sun Jun 12, 2011 12:06 pm
- Location: Poland
Re: Connect AY-3-8910 sound chip to FME-7 board
Yep, and 8910.A8=VCC, 8910./A9=GND, 8910.CLK=M2 divided by 2
Re: Connect AY-3-8910 sound chip to FME-7 board
Thank you krzysiobal! I'll try making my reproduction.krzysiobal wrote:Yep, and 8910.A8=VCC, 8910./A9=GND, 8910.CLK=M2 divided by 2