- Joined
- Nov 29, 2005
- Posts
- 4,299
Had a TG16 in for repair for a forum member. It wouldn't boot any cartridges.
Checked the board with the logic probe and was getting VERY strange readings off of the cart slot and address line A2 was dead on the Work SRAM IC.
Pinned out the SRAM and partially pinned the CPU. Ran a jumper to patch A2. Still had strange readings.
Replaced the Work SRAM IC (surface mount 6264 8k x 8 SRAM IC) but still had strange readings on the HuCard slot.
Cleaned the HuCard slot then resoldered it to finish the repair.
How did I clean it? Wrap a sheet of rough paper over the top of the HuCard, put enough pure alcohol on it to wet the paper then slide it in and out of the slot a few times. It came out pretty dirty.
It's just another game system. Granted, it has a strange architecture but like other game consoles of its era it has no built-in ROMs so if it can't read the cart slot it won't be able to boot to do anything. It also has no diagnostic routines (no BIOS ROM and no diagnostic cart) so if the Work RAM is bad it might not boot at all.
Here are the partial pinouts for the CPU and the HuCard slot. You can easily get the data sheet for the 6264 SRAM IC on the internet yourself. (hint: http://www.datasheetarchive.com)
Enjoy!
RJ
Checked the board with the logic probe and was getting VERY strange readings off of the cart slot and address line A2 was dead on the Work SRAM IC.
Pinned out the SRAM and partially pinned the CPU. Ran a jumper to patch A2. Still had strange readings.
Replaced the Work SRAM IC (surface mount 6264 8k x 8 SRAM IC) but still had strange readings on the HuCard slot.
Cleaned the HuCard slot then resoldered it to finish the repair.
How did I clean it? Wrap a sheet of rough paper over the top of the HuCard, put enough pure alcohol on it to wet the paper then slide it in and out of the slot a few times. It came out pretty dirty.
It's just another game system. Granted, it has a strange architecture but like other game consoles of its era it has no built-in ROMs so if it can't read the cart slot it won't be able to boot to do anything. It also has no diagnostic routines (no BIOS ROM and no diagnostic cart) so if the Work RAM is bad it might not boot at all.
Here are the partial pinouts for the CPU and the HuCard slot. You can easily get the data sheet for the 6264 SRAM IC on the internet yourself. (hint: http://www.datasheetarchive.com)
Enjoy!
RJ
Code:
HUC6280 CPU:
1 - A5
2 - A4
3 - A3
4 - A2 ?
5 - A1
6 - A0
7 - GND
8 - VCC
9 -
10 - CLK
11 - RESET*
12 -
13 -
14 - ?? HU #35
15 - VCC
16 - GND
17 -
18 -
19 - VCC
20 -
21 - GND
22 -
23 -
24 -
25 -
26 -
27 -
28 -
29 - GND
30 -
31 -
32 -
33 -
34 -
35 -
36 -
37 -
38 -
39 -
40 -
41 -
42 -
43 - ?? HU # 37
44 -
45 -
46 -
47 - VCC
48 - GND
49 - D2
50 - D1
51 - D0
52 - D3
53 - D4
54 - D5
55 - D6
56 - D7
57 - VCC
58 - GND
59 -
60 -
61 - SRAM CE1*
62 - SRAM OE*
63 - SRAM WE*
64 - ?? HU #24
65 - ?? HU #3
66 - A18 ?
67 - A17 ?
68 - A16
69 - A15
70 - A14
71 - A13
72 - A12
73 - A11
74 - A10
75 - GND
76 - VCC
77 - A9
78 - A8
79 - A7
80 - A6
HuCard:
1 - Back panel C3
2 - Audio in ?? Back panel B1
3 - CPU # 65 ??
4 - A16
5 - A15
6 - A12
7 - A7
8 - A6
9 - A5
10 - A4
11 - A3
12 - A2
13 - A1
14 - A0
15 - D7
16 - D6
17 - D5
18 - GND
19 - D4
20 - D3
21 - D0
22 - D1
23 - D2
24 - CPU # 64 ??
25 - A10
26 - SRAM OE* ?? SAME AS SRAM
27 - A11
28 - A9
29 - A8
30 - A13
31 - A14
32 - A17 ??
33 - A18 ??
34 - SRAM WE* ?? SAME AS SRAM
35 - CPU # 14 ??
36 - RESET*
37 - CPU # 43 ??
38 - VCC