Thanks to the help of HRA! KdL have finally fixed a new hardware bug affecting all 1chipMSX, Zemmix Neo, SX-1, SM-X and related machines produced to date.
In the last few months MRC power user KdL had received some reports from ToughkidCST and Marcel Delorme explaining the presence of anomalies with the combination of some external cartridges.
Two days ago KdL had discovered how to reactivate those cartridges but only today he had confirmation of this discovery from the investigations of HRA!
BUSDIR_n patch is not for Minime OCM as this machine only got one cartrisge slot.
THE ISSUE:
- In OCM machines we have a short circuit between pin-10 (BUSDIR_n) of the two external slots that continues towards the FPGA. This type of connection confuses some cartridges.
- While the Panasonic FS-A1GT and Canon V-20 service manuals confirmed that the BUSDIR signal is not used.
THE FIX:
- Pin-10 (BUSDIR_n) of the external slots must be isolated.
HOW TO DO:
- Method 1 - Cut the track that connects pin-10 of Slot-1 and Slot-2 leaving unchanged the connection to the FPGA already internally isolated by the firmware.
- Method 2 - Desolder pin-10 of slot-2 from the PCB and insulate it with the sheath of an electric wire and a drop of hot glue.
- Method 3 - Place non conducting tape over pin 10 of those cartridges that are not working properly, such as MoonSound and Darky. Check this example.
We hope you enjoy this new solution and have fun with your devices.
Reacties (55)
Van msd
Paragon (1412)
20-08-2020, 12:40
Van gdx
Prophet (4040)
20-08-2020, 13:11
Van msd
Paragon (1412)
20-08-2020, 13:50
Van Robosoft
Expert (87)
20-08-2020, 13:52
Van msd
Paragon (1412)
20-08-2020, 14:00
Van Robosoft
Expert (87)
20-08-2020, 14:18
Van Parn
Hero (628)
20-08-2020, 14:28
Van msd
Paragon (1412)
20-08-2020, 14:40
Van msd
Paragon (1412)
20-08-2020, 14:51
Van gdx
Prophet (4040)
20-08-2020, 15:13
Van Meits
Scribe (6209)
20-08-2020, 15:15
Van hamlet
Scribe (3444)
20-08-2020, 15:37
Van Briqunullus
Champion (293)
20-08-2020, 15:49
Van hamlet
Scribe (3444)
20-08-2020, 15:56
Van ToriHino
Hero (641)
20-08-2020, 17:50
Van gdx
Prophet (4040)
20-08-2020, 18:26
Van ducasp
Champion (400)
20-08-2020, 18:31
Van gdx
Prophet (4040)
20-08-2020, 19:38
Van raymond
Champion (485)
20-08-2020, 20:09
Van ducasp
Champion (400)
20-08-2020, 22:40
Van OeiOeiVogeltje
Paragon (1389)
20-08-2020, 23:03
Van lovemsxfan
Supporter (7)
21-08-2020, 10:09
Van KdL
Paragon (1375)
21-08-2020, 11:38
Van AxelF
Champion (373)
21-08-2020, 11:39
Van KdL
Paragon (1375)
21-08-2020, 12:12
Van msd
Paragon (1412)
21-08-2020, 12:20
Van Omega
Master (227)
21-08-2020, 13:10
Van msd
Paragon (1412)
21-08-2020, 13:13
Van ducasp
Champion (400)
21-08-2020, 13:34
Van Grauw
Ascended (9580)
21-08-2020, 13:48
Van msd
Paragon (1412)
21-08-2020, 14:18
Van gdx
Prophet (4040)
21-08-2020, 15:15
Van HRA!
Master (245)
21-08-2020, 17:02
Van syn
Paragon (2014)
23-08-2020, 11:42
Van ducasp
Champion (400)
23-08-2020, 14:12
Van KdL
Paragon (1375)
24-08-2020, 03:32
Van Grauw
Ascended (9580)
24-08-2020, 17:16
Van gflorez
Rookie (30)
25-08-2020, 04:10
Van KdL
Paragon (1375)
25-08-2020, 12:56
Van KdL
Paragon (1375)
26-08-2020, 06:48
Van KdL
Paragon (1375)
26-09-2020, 18:02
Van OeiOeiVogeltje
Paragon (1389)
27-09-2020, 11:39
Van KdL
Paragon (1375)
16-10-2020, 21:38
Van Haze
Expert (114)
18-10-2020, 00:46
Van gdx
Prophet (4040)
18-10-2020, 11:27
Van KdL
Paragon (1375)
18-10-2020, 14:02
Van Pablibiris
Paragon (1800)
18-10-2020, 16:59
Van KdL
Paragon (1375)
19-10-2020, 00:13
Van KdL
Paragon (1375)
19-10-2020, 14:42
Van KdL
Paragon (1375)
19-10-2020, 19:24
Van gflorez
Rookie (30)
20-10-2020, 17:16
Van gflorez
Rookie (30)
20-10-2020, 20:39
Van Louthrax
Prophet (2398)
21-10-2020, 21:41
Van gdx
Prophet (4040)
22-10-2020, 01:48
Van KdL
Paragon (1375)
22-10-2020, 16:55