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SailorSat
MAME Fan
Reged: 03/04/07
Posts: 169
Loc: Germany
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Re: Help emulating the model1 comm board
01/19/13 03:47 AM


> MAME has a very complete, cycle-accurate 8237A DMA device under the AMD part number:
> am9517a.c/.h.
>
> There's also an older i8237 emulation that isn't as good; it couldn't support e.g.
> SoundBlaster and other ISA DMA in the MESS PC driver so am9517a.c was born. But some
> drivers haven't been converted to the better implementation yet.

We'll see

Some mystery solved:
JP2 selects A15 on the EEPROM
JP3 selects A16 on the EEPROM

JP2 --. = +5V
JP2 .-- = GND
--. JP3 = GND
.-- JP3 = some pin [NOT Q] on IC16 (internal SRAM)

---

JP4 selects [NOT G] on the EEPROM
JP4 --. = some pin [NOT Q] on IC16 (internal SRAM)
JP4 .-- = GND

---

JP5 connects RX line to TOSLINK receiver
open = TOSLINK disabled
close = TOSLINK enabled

---

JP6 connects RX line to [R] Pin 2 of IC27
open = DIFFERENTIAL disabled
close = DIFFERENTIAL enabled

---

CN4 is a DIFFERENTIAL connection
Pin 1 = GND
Pin 2+2 = TX Line Pair
Pin 4 = GND
Pin 5+6 = RX Line Pair
Pin 7+8 = not connected

---

CN5 is connected to the two PC910 ICs

Pin 1 = connected to R12 (to +5V)
Pin 2 = connected to R13 (to IC32 Pin 6)
Pin 3 = GND
Pin 4 = not connected
Pin 5 = IC33 Pin 3
Pin 6 = IC33 Pin 2

---

JP8 selects CLOCK SOURCE
1-2 = External (Model1 CPU?)
2-3 = Internal (Comm board)

As there is no OSC on the Comm board, not very fancy though.
But...

The CLOCK signal runs through an "POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOP" resulting CLOCK/2

CLOCK/2 then splits up.

One line goes to the "other side" of the "POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOP" resulting in CLOCK/4

CLOCK/4 then goes to the DMA CLK (Pin12), DLC CLK (Pin1) and Z80 CLK (Pin 6)


The other CLOCK/2 goes to one of the inputs of IC4 (Pin5) and gets inverted (Pin6) and routed to IC21 CLK (Pin2), a 4bit counter

---

SW1 connects GND to R16 (connected to [NOT PRE] Pin 4 on IC9)
may be some count of reset


I do all that stuff even without a Joystick
Soft-15kHz, cabMAME, For Amusement Only e.V.







Entire thread
Subject Posted by Posted on
* Help emulating the model1 comm board SailorSat 10/16/12 01:22 AM
. * Re: Help emulating the model1 comm board SailorSat  01/05/13 12:26 PM
. * Re: Help emulating the model1 comm board Embryoice  12/31/12 12:41 AM
. * Re: Help emulating the model1 comm board jedpossum  01/04/13 09:03 PM
. * Re: Help emulating the model1 comm board Embryoice  01/05/13 07:42 AM
. * Re: Help emulating the model1 comm board jedpossum  01/05/13 07:57 PM
. * Re: Help emulating the model1 comm board SailorSat  01/09/13 01:56 AM
. * Re: Help emulating the model1 comm board nuexzz  01/09/13 12:42 PM
. * Re: Help emulating the model1 comm board Embryoice  01/09/13 08:53 PM
. * Re: Help emulating the model1 comm board SailorSat  01/16/13 04:03 PM
. * Re: Help emulating the model1 comm board RetroRepair  01/16/13 05:21 PM
. * Re: Help emulating the model1 comm board nuexzz  01/16/13 07:31 PM
. * Re: Help emulating the model1 comm board RetroRepair  01/16/13 10:26 PM
. * Re: Help emulating the model1 comm board nuexzz  01/17/13 01:15 AM
. * Re: Help emulating the model1 comm board SailorSat  01/16/13 09:15 PM
. * Re: Help emulating the model1 comm board RetroRepair  01/16/13 10:34 PM
. * Re: Help emulating the model1 comm board SailorSat  01/16/13 11:04 PM
. * Re: Help emulating the model1 comm board RetroRepair  01/16/13 11:28 PM
. * Re: Help emulating the model1 comm board SailorSat  01/17/13 04:17 PM
. * Re: Help emulating the model1 comm board SailorSat  01/18/13 01:38 AM
. * Re: Help emulating the model1 comm board SailorSat  01/18/13 02:53 AM
. * Re: Help emulating the model1 comm board SailorSat  01/18/13 03:13 AM
. * Re: Help emulating the model1 comm board StilettoAdministrator  01/18/13 06:46 AM
. * Re: Help emulating the model1 comm board SailorSat  01/18/13 07:15 AM
. * Re: Help emulating the model1 comm board R. Belmont  01/18/13 11:03 PM
. * Re: Help emulating the model1 comm board SailorSat  01/19/13 03:47 AM
. * Re: Help emulating the model1 comm board Junoman  01/19/13 04:12 AM
. * Re: Help emulating the model1 comm board SailorSat  01/19/13 10:15 AM
. * Re: Help emulating the model1 comm board SailorSat  01/20/13 04:05 AM
. * Re: Help emulating the model1 comm board SailorSat  01/21/13 01:20 AM
. * Re: Help emulating the model1 comm board RetroRepair  01/22/13 04:52 AM
. * Re: Help emulating the model1 comm board SailorSat  01/23/13 01:08 AM
. * Re: Help emulating the model1 comm board Naoki  01/25/13 12:34 AM
. * Re: Help emulating the model1 comm board SailorSat  01/31/13 09:29 AM
. * Re: Help emulating the model1 comm board SailorSat  02/02/13 11:15 AM
. * Re: Help emulating the model1 comm board RetroRepair  02/03/13 01:52 PM
. * Re: Help emulating the model1 comm board SailorSat  02/03/13 02:05 PM
. * Re: Help emulating the model1 comm board RetroRepair  02/03/13 02:23 PM
. * Re: Help emulating the model1 comm board SailorSat  02/03/13 02:24 PM
. * Re: Help emulating the model1 comm board RetroRepair  02/03/13 03:47 PM
. * Re: Help emulating the model1 comm board RetroRepair  02/03/13 04:00 PM
. * Re: Help emulating the model1 comm board R. Belmont  02/05/13 08:22 PM
. * Re: Help emulating the model1 comm board RetroRepair  02/06/13 04:00 AM
. * Re: Help emulating the model1 comm board R. Belmont  02/06/13 05:53 PM
. * Re: Help emulating the model1 comm board dgame  02/06/13 11:54 PM
. * Re: Help emulating the model1 comm board Embryoice  02/06/13 09:48 AM
. * Re: Help emulating the model1 comm board RetroRepair  02/03/13 04:58 PM
. * Re: Help emulating the model1 comm board vandale  02/04/13 02:58 AM
. * Re: Help emulating the model1 comm board SailorSat  02/04/13 07:18 AM
. * Re: Help emulating the model1 comm board R. Belmont  02/07/13 06:54 AM
. * Re: Help emulating the model1 comm board SailorSat  02/07/13 09:17 AM
. * Re: Help emulating the model1 comm board R. Belmont  02/21/13 11:11 PM
. * Re: Help emulating the model1 comm board SailorSat  02/22/13 08:59 AM
. * Re: Help emulating the model1 comm board coltonmameworld  12/31/14 01:16 AM
. * Re: Help emulating the model1 comm board fortuna_chan  02/26/13 12:40 AM
. * Re: Help emulating the model1 comm board R. Belmont  02/28/13 06:03 PM
. * Re: Help emulating the model1 comm board FMecha  03/04/13 07:36 PM
. * Re: Help emulating the model1 comm board SailorSat  03/05/13 09:39 AM
. * Re: Help emulating the model1 comm board R. Belmont  03/06/13 06:14 PM
. * Re: Help emulating the model1 comm board R. Belmont  03/10/13 08:29 PM
. * Re: Help emulating the model1 comm board SailorSat  03/18/13 09:36 AM
. * Re: Help emulating the model1 comm board Boomslangnz  03/31/13 04:04 AM
. * Re: Help emulating the model1 comm board Embryoice  04/01/13 06:14 PM
. * Re: Help emulating the model1 comm board R. Belmont  04/03/13 02:13 AM
. * Re: Help emulating the model1 comm board MichaelMichael54321  04/07/13 10:37 PM
. * Re: Help emulating the model1 comm board SailorSat  07/10/13 04:50 PM
. * Re: Help emulating the model1 comm board Retro27  07/22/13 12:22 PM
. * Re: Help emulating the model1 comm board SailorSat  08/02/13 02:17 PM
. * Re: Help emulating the model1 comm board SailorSat  10/14/14 12:36 AM
. * Re: Help emulating the model1 comm board SailorSat  10/14/14 07:11 PM
. * Re: Help emulating the model1 comm board R. Belmont  10/16/14 09:32 PM
. * Re: Help emulating the model1 comm board SailorSat  10/17/14 12:31 AM
. * Re: Help emulating the model1 comm board Naoki  08/02/13 04:08 PM
. * Re: Help emulating the model1 comm board Naoki  07/10/13 06:36 PM
. * Re: Help emulating the model1 comm board nuexzz  07/10/13 10:46 PM
. * Re: Help emulating the model1 comm board R. Belmont  03/20/13 04:48 PM
. * Re: Help emulating the model1 comm board Embryoice  03/18/13 03:23 PM
. * Re: Help emulating the model1 comm board Naoki  03/04/13 09:33 PM
. * Re: Help emulating the model1 comm board R. Belmont  03/04/13 09:57 PM
. * Re: Help emulating the model1 comm board nuexzz  02/02/13 07:59 PM
. * Re: Help emulating the model1 comm board StilettoAdministrator  01/23/13 02:09 AM
. * Re: Help emulating the model1 comm board SailorSat  01/18/13 03:47 PM
. * Re: Help emulating the model1 comm board StilettoAdministrator  01/18/13 04:27 PM
. * Re: Help emulating the model1 comm board RetroRepair  01/18/13 04:04 AM
. * Re: Help emulating the model1 comm board SailorSat  01/18/13 04:13 AM
. * Re: Help emulating the model1 comm board Embryoice  01/18/13 04:20 AM
. * Re: Help emulating the model1 comm board Embryoice  01/18/13 04:10 AM
. * Re: Help emulating the model1 comm board RetroRepair  01/18/13 05:05 AM
. * Re: Help emulating the model1 comm board StilettoAdministrator  12/31/12 12:56 AM
. * Re: Help emulating the model1 comm board RetroRepair  12/24/12 12:20 PM
. * Re: Help emulating the model1 comm board SailorSat  12/24/12 01:17 PM
. * Re: Help emulating the model1 comm board RetroRepair  12/24/12 02:24 PM
. * Re: Help emulating the model1 comm board SailorSat  12/30/12 01:26 PM
. * Re: Help emulating the model1 comm board SailorSat  12/30/12 07:24 PM
. * Re: Help emulating the model1 comm board SailorSat  12/30/12 10:45 PM
. * Re: Help emulating the model1 comm board Retro27  12/31/12 01:42 AM
. * Re: Help emulating the model1 comm board SailorSat  12/31/12 03:48 AM
. * Re: Help emulating the model1 comm board SailorSat  12/31/12 04:04 AM
. * Re: emulating the model1 comm board gregf  01/02/13 10:25 AM
. * Re: Help emulating the model1 comm board SailorSat  12/31/12 08:57 AM
. * Re: Help emulating the model1 comm board bdam  01/02/13 02:39 PM
. * Re: Help emulating the model1 comm board R. Belmont  01/03/13 12:28 AM
. * Re: Help emulating the model1 comm board StilettoAdministrator  01/04/13 08:46 PM
. * Re: Help emulating the model1 comm board R. Belmont  01/04/13 09:34 PM
. * Re: Help emulating the model1 comm board SailorSat  01/05/13 12:42 AM
. * Re: Help emulating the model1 comm board Reznor007  01/05/13 02:33 AM
. * Re: Help emulating the model1 comm board bdam  01/03/13 02:29 AM
. * Re: Help emulating the model1 comm board R. Belmont  01/03/13 03:13 AM
. * Re: Help emulating the model1 comm board SailorSat  01/02/13 06:55 PM
. * Re: Help emulating the model1 comm board nuexzz  01/04/13 09:30 AM
. * Re: Help emulating the model1 comm board Embryoice  01/02/13 09:04 PM
. * Re: Help emulating the model1 comm board RetroRepair  01/03/13 12:30 AM
. * Re: Help emulating the model1 comm board SailorSat  01/03/13 01:49 AM
. * Re: Help emulating the model1 comm board R. Belmont  01/03/13 03:28 AM
. * Re: Help emulating the model1 comm board drewcifer  01/03/13 07:13 PM
. * Re: Help emulating the model1 comm board SailorSat  01/03/13 10:05 PM
. * Re: Help emulating the model1 comm board StilettoAdministrator  01/04/13 08:50 PM
. * Re: Help emulating the model1 comm board Ramirez  01/04/13 12:15 PM
. * Re: Help emulating the model1 comm board Dullaron  01/04/13 02:33 AM
. * Re: Help emulating the model1 comm board R. Belmont  01/04/13 02:10 AM
. * Re: Help emulating the model1 comm board Naoki  01/04/13 12:21 AM
. * Re: Help emulating the model1 comm board Embryoice  12/31/12 12:01 AM
. * Re: Help emulating the model1 comm board Embryoice  02/02/13 08:19 PM
. * Re: Help emulating the model1 comm board SailorSat  02/03/13 01:09 AM
. * Re: Help emulating the model1 comm board vandale  02/03/13 03:27 AM
. * Re: Help emulating the model1 comm board SailorSat  02/03/13 03:35 AM
. * Re: Help emulating the model1 comm board vandale  02/03/13 04:34 AM
. * Re: Help emulating the model1 comm board vandale  02/03/13 05:42 AM
. * Re: Help emulating the model1 comm board vandale  02/03/13 08:27 AM
. * Re: Help emulating the model1 comm board SailorSat  02/03/13 01:26 PM
. * Re: Help emulating the model1 comm board StilettoAdministrator  12/31/12 12:22 AM
. * Re: Help emulating the model1 comm board Embryoice  12/31/12 12:33 AM
. * Re: Help emulating the model1 comm board Embryoice  12/31/12 12:10 AM
. * Re: Help emulating the model1 comm board SailorSat  12/31/12 12:16 AM
. * Re: Help emulating the model1 comm board R. Belmont  11/05/12 05:55 AM
. * Re: Help emulating the model1 comm board Lord Nightmare  10/21/12 06:50 PM
. * Re: Help emulating the model1 comm board FMecha  10/18/12 09:11 AM

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