new to atom: ram rom mmc joystick

[tricky]

I am another new atom guardian.
I sort of ordered a ram/ROM board at abug south, I think from prime, but as I can't remember names or faces I'm not sure who it was.

I would like an AtoMMC kit, but built is fine. I think they are hoglet's, but not sure if anyone sells them.

I would also like to know if there is a standard wiring for joysticks?

I am thinking of making up a dual Sega adapter like I made for the beeb/master.

With 0v, 5v and 6 IO pins you could support a two button (or use 2 off 6) Sega controller.
With 7 IO pins you could support all 6 buttons.
With 7 and a couple of ls157s you could have two controllers with 2 buttons.
8 + 157s could be 2 controllers with 6 buttons each.
8 + 6 157s would support 4 controllers with 2 buttons each.

The above would also work for Atari, but they would only have 1 button and require resistors if the IO pins don't have pull-up/downs.

If there is a standard, I would like to be compatible.

[Elminster]

Hopefully on my hardware list in link in signature. If things are missing let me know and I will add them. Not having an Atom some of that hardware misses me.

[danielj]

SirMorris (Charlie) for the AtomMMC. Prime for the RAM/ROM

d.

[1024MAK]

RAM/ROM boards are from Prime (Phill)

AtoMMC kits (built but requires installation) are supplied by SirMorris (Charlie). PM him

Ahh, I see Daniel got in before me. Well at least you know I was not editing this while driving...

Mark

[tricky]

Messages sent to sirmorris (via email) and prime (private message).

Does anyone have any thoughts about joysticks?

I'm thinking two buttons are plenty, but also I don't know of anything needing four controllers.

[oss003]

Hi Tricky,

in all my games, I use this digital joystick configuration:
The joystick is connected to User Port of the AtoMMC interface and wired like this:

Code: Select all

AtoMMC  Joystick
-----------------
 PB0  -  Right
 PB1  -  Left
 PB2  -  Down
 PB3  -  Up
 PB4  -  Fire
 PB5  -  nc
 PB6  -  nc
 PB7  -  nc

 GND  -  GND

This can be expanded for more buttons of course.
For now, it only supports 1 joystick.
Just one remark: GND is not supported on User Port pin header so has to be connected manually.
I don't know if Charlie changed this for the newer boards .....

I also found some interesting stuff about a multiplayer gaming network for the C64 with 2x 6522 ....
The original Italian article and a Google translate article are attached.

Greetings
Kees

[tricky]

Thanks Kees, that was the sort of thing I was hoping for.
I'm being a bit lazy; do you set the other bits as input or output and if out what do you set then to?
I was expecting to have to pick up GND separately and 5V for the Sega controllers.
I won't be doing anything until I get my AtoMMC anyway, but I would be interested in any thoughts you have about number of fire buttons and number of controllers.

[oss003]

I set all bits to input, this is my joystick routine:

Code: Select all

;----------------------------------------------------------
; Set PORTB direction
;----------------------------------------------------------

joyinit:
	lda #$ff   ; Write value to latch, bits 0-7 input
	sta $b401
	jsr interwritedelay
	lda #$a1   ; Write direction in latch to PORTB
	sta $b400
wait_until_not_busy:
	lda $b400
	bmi wait_until_not_busy
	rts

;----------------------------------------------------------
; Get PORTB value
;----------------------------------------------------------

joyget:
	lda #$a2   ; Read value PORTB in latch
	sta $b400
	jsr interwritedelay
	lda $b401
	beq no_joystick
	eor #$ff
	and #$1f
no_joystick:
	rts

;----------------------------------------------------------
; Short delay
;
; Enough to intersperse 2 writes to the FATPIC.
;----------------------------------------------------------

interwritedelay:
	lda  #8
	sec
loop:
	sbc  #1
	bne  loop
	rts

Greetings
Kees

[oss003]

For the Atom, there are only a few 2 player games and there is a Dutch User Group 2 joystick solution.
Solder the joystick wires parallel to the top 2 rows of the keyboard matrix.

Maybe a second button could be added but I don't know if there's any need for more buttons.

Didn't know you had an Atom Tricky, looking for a new challenge? .....

Greetings
Kees

[tricky]

I am trying to avoid any more challenges at the moment It is quite tempting though.
I am planning to take the atom to the shows that I do and want it to show its best side, although I'm sticking with composite for now.

[IanS]

I set all bits to input

Can you configure a couple of pins as outputs? So you you could use two outputs as column outputs and have a 2x6 matrix of switches for up/down/left/right/fire1/fire2 for 2 players. Probably need some diodes to avoid gosting effects.

[oss003]

I set all bits to input

Can you configure a couple of pins as outputs? So you you could use two outputs as column outputs and have a 2x6 matrix of switches for up/down/left/right/fire1/fire2 for 2 players. Probably need some diodes to avoid gosting effects.

Nice idea to create a matrix .....
Yes, every bit can be set as input or output, just like the VIA.
Or use a 74LS157 demultiplexer to create a 6x4 matrix for 4 joysticks.

Greetings
Kees

[tricky]

AtomMmc arrived today, had to bodge a power connector (which hasn't arrived yet) as I couldn't wait to try it.

Was the original idea to solder it to the connector instead of the ribbon cable?
I'm trying to find a good place to mount it, current options are:

• Leave it internal attached to its main board.

• Attach it to the back, so the top of the card is just visible at the back of the Atom.

• Try to make a bracket so that the card pokes out through the power/AV hole (composite goes through RF socket).

Just need to find out how to contact Prime.

[1024MAK]

Phill (Prime) is a regular here, so PM him. Alternatively he is on Facebook.

Mark

[tricky]

I already did

[oss003]

Normally the AtoMMC is suppled with a flatcable between PL4 and the AtoMMC interface.
Another flatcable is used to connect the AtoMMC interface with the SD board which hangs outside the Atom.

Wim did solder a female connector to the AtoMMC board to install the AtoMMC interface directly on PL4.
The coloured flatcable is a joystick cable with on the other end a 9=pin D-connector.

Greetings
Kees

[Multiwizard]

Indeed I did, in several Atoms...

[sirmorris]

I have to admit that I didn't consider mounting on top like the econet board - I always just imagined popping the main interface board underneath the atom motherboard with the slot card hanging outside. I didn't think there was room on top as it's pretty cosy there under the lid. I was wary of shorting things out. That said, the prototype fitted there - it copied the form of the econet card.

I could offer this as a mounting option I guess..

[Multiwizard]

Wim did solder a female connector to the AtoMMC board to install the AtoMMC interface directly on PL4.

Greetings
Kees

Hi Kees,

I was just checking the Atoms which I did this way.

The pics you showed the AtoMMC2 is soldered directly onto the Atom PCB with headers:

viewtopic.php?f=44&t=10262&p=149256&hil ... go#p123461

The version you meant are a little lower in that topic from my AtoMMC2go version:

viewtopic.php?f=44&t=10262&p=149256&hil ... go#p149255

Which do not fit underneath the top lid of the Atom.


Greetings, Wim...