John Bennett
Senior Member
Following on from our Space Harrier/Outrun DLX
motor drive boards, we are looking to create Afterburner DLX compatible drive
boards.
As the Afterburner boards are very similar, it would seem wrong not to do a
reworking.
If anyone wants to chip in, and maybe have a play with Circuitmaker, please do. It's about making something decent and having a bit of fun as a team, rather than anyone making money. I can't imagine there's too many cabinets out there needing boards either.
With a bit of help, I’ve managed to come up with schematics that seem about
right and I’ve started on modifying the PCB (above), but there’s certainly a bit of
routing to do.
Like the previous boards, it’s as much an art project as it is electronics, so
if anyone has boards they could stick in scanners and take measurements of,
please do - getting the routing and dimensions spot-on is the bit I'm struggling with right now, having just got photos off the 'net to copy from.
The circuitmaker project is here:
https://circuitmaker.com/Projects#/839-0086/7//1
The pictures I’ve got so far are:
[
And some very helpful close-ups on:
http://www.gamoover.net/Forums/index.php?topic=22323.384
And thanks to Retroclinic and Ordyne and Porchy, we have a PAL dumps.
It's worth mentioning I’ve no intention of making hardware until all 50 Space Harrier Boards
are done and shipped - consider this slow-burning future R&D.
Observations so far:
Circuit is same principle as SH, but has two triacs per motor and a
bi-directional 80V transformer. This allows power pulses on both half cycles of
the mains, giving twice the output of the SH boards.
Most of the circuit is identical (95%, perhaps) - this board is almost a ‘hack’, with the
triacs on a separate PCB.
One extra logic IC is present to do a mains-sync operation that was done in the
PAL in SH. Presumably there was no room with the extra control needed for
Afterburner.
Afterburner differs mostly in the PAL code, with double the equations to
provide ‘full-wave’ power transfer.
Confusingly, the PAL dumps show no connection for one of the gate signal to the two triacs. If true then
the extra capacity is unused (SEGA coded it out before release). This board
will use jumpers to allow both possibilities.
3-pin filters are used on the 5V power circuits (maybe they had issues with
SH?!)
As with SH, there are ‘clutch’ drivers for the two motors. These are not
populated.
Most of the PCB has the same routing of SH - this is a bit of a 'hack'.
So, anyway, I'll update this thread and add more info as I go on, but anyone up for helping, let me know.
John Bennett2019-02-24 09:44:52
motor drive boards, we are looking to create Afterburner DLX compatible drive
boards.
As the Afterburner boards are very similar, it would seem wrong not to do a
reworking.
If anyone wants to chip in, and maybe have a play with Circuitmaker, please do. It's about making something decent and having a bit of fun as a team, rather than anyone making money. I can't imagine there's too many cabinets out there needing boards either.
With a bit of help, I’ve managed to come up with schematics that seem about
right and I’ve started on modifying the PCB (above), but there’s certainly a bit of
routing to do.
Like the previous boards, it’s as much an art project as it is electronics, so
if anyone has boards they could stick in scanners and take measurements of,
please do - getting the routing and dimensions spot-on is the bit I'm struggling with right now, having just got photos off the 'net to copy from.
The circuitmaker project is here:
https://circuitmaker.com/Projects#/839-0086/7//1
The pictures I’ve got so far are:
[
And some very helpful close-ups on:
http://www.gamoover.net/Forums/index.php?topic=22323.384
And thanks to Retroclinic and Ordyne and Porchy, we have a PAL dumps.
It's worth mentioning I’ve no intention of making hardware until all 50 Space Harrier Boards
are done and shipped - consider this slow-burning future R&D.
Observations so far:
Circuit is same principle as SH, but has two triacs per motor and a
bi-directional 80V transformer. This allows power pulses on both half cycles of
the mains, giving twice the output of the SH boards.
Most of the circuit is identical (95%, perhaps) - this board is almost a ‘hack’, with the
triacs on a separate PCB.
One extra logic IC is present to do a mains-sync operation that was done in the
PAL in SH. Presumably there was no room with the extra control needed for
Afterburner.
Afterburner differs mostly in the PAL code, with double the equations to
provide ‘full-wave’ power transfer.
Confusingly, the PAL dumps show no connection for one of the gate signal to the two triacs. If true then
the extra capacity is unused (SEGA coded it out before release). This board
will use jumpers to allow both possibilities.
3-pin filters are used on the 5V power circuits (maybe they had issues with
SH?!)
As with SH, there are ‘clutch’ drivers for the two motors. These are not
populated.
Most of the PCB has the same routing of SH - this is a bit of a 'hack'.
So, anyway, I'll update this thread and add more info as I go on, but anyone up for helping, let me know.
John Bennett2019-02-24 09:44:52
