Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-22 16:31:49 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

Flaming 7 (W-4 hardware): Added hand made electronic serial DS2401 dump,

Browse Source 
as a start of electronic serial number support. Added technical notes.
[Roberto Fresca]
This commit is contained in:
RobertoFresca 2016-05-29 22:22:47 -03:00
parent 585cfd0712
commit ae4cecaf60
1 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/mame/drivers/goldstar.cpp
View File

@ -14089,10 +14089,14 @@ ROM_END
W-4 PCB type has some hacks...
1) PPI 8255 pin 10 (PC7) is wired to pin 22 (PB4)...
Maybe the boot protection?
2) Pin 39 from solder side (speaker GND) and pin 04 from components side (PPI 8255 pin 11, PC6)
are wired with a DS2401 (sillicon serial number) device, to pins 1 & 2 (GND & DATA).
DS2401 has 64bits of internal data: 8 bits for family type + 48 bits for serial + 8 bits for CRC.
Maxim/Dallas 1-Wire devices use what is called Dow CRC to check that the data bytes were received correctly.
This returns an 8-bit CRC value as the last byte and uses a polynomial of X^8 + X^5 + X^4 + X^0.
3) Z80 /INT line (pin 16) is out of socket and wired to a 74161.
@ -14114,7 +14118,7 @@ ROM_END
navigate between pages. Press BOOKS/STATS/SETUP (key 0) to exit the Bookkeeping mode.
*/
ROM_START( fl7_3121 ) // Red, White & Blue 7's + Hollywood Nights.
ROM_START( fl7_3121 ) // Red, White & Blue 7's + Hollywood Nights. Serial 7D063B800000.
ROM_REGION( 0x8000, "maincpu", 0 )
ROM_LOAD( "main.14b", 0x0000, 0x8000, CRC(5756e927) SHA1(5448e1ca4ae060b086145eee10b8dc6eb05acc56) )
@ -14141,6 +14145,10 @@ ROM_START( fl7_3121 ) // Red, White & Blue 7's + Hollywood Nights.
ROM_REGION( 0x20, "unkprom2", 0 )
ROM_LOAD( "82s123.d12", 0x0000, 0x0020, CRC(6df3f972) SHA1(0096a7f7452b70cac6c0752cb62e24b643015b5c) )
ROM_REGION(0x8, "serial_id", 0) /* Electronic Serial DS2401 */
ROM_LOAD( "ds2401.bin", 0x0000, 0x0008, BAD_DUMP CRC(747b40b1) SHA1(3336d8de5333057beb5f55873b9410cc7bf73fbb) ) // Hand built... Last byte is CRC-8. Need to be checked.
ROM_END