Canon V-30F MSX2

Страница 5/11
1 | 2 | 3 | 4 | | 6 | 7 | 8 | 9 | 10

By popolon_

Champion (261)

Аватар пользователя popolon_

02-11-2021, 09:21

Vram socket pinout does not currently have +5v line connected, because FB107 actual component is missing. So is this some kind of proto version or what, as the vram module would not work without soldering that fuse.

IMG_20211102_101659034.jpg

By gdx

Enlighted (5503)

Аватар пользователя gdx

02-11-2021, 14:30

Mars2000you@ You say it's a prototype because there is no serial number?

mars2000you wrote:

Besides, there's a picture on your Yahoo auction showing the boot screen with 128kB VRAM : https://page.auctions.yahoo.co.jp/jp/auction/c1012275987

Did the seller forgot not to put the VRAM cartridge in the package or is he dishonest?

By mars2000you

Enlighted (6227)

Аватар пользователя mars2000you

02-11-2021, 14:40

Read what popolon has written just above.

The absence of serial number is another indice.

By popolon_

Champion (261)

Аватар пользователя popolon_

02-11-2021, 15:43

In backplate, there is no serial number. At the bottom of the case there is something, but propably seller tag?
IMG_20211102_163526813.jpg
IMG_20211102_163707007.jpg

By popolon_

Champion (261)

Аватар пользователя popolon_

02-11-2021, 20:30

VRAM socket (seen at the back of the computer) pinout (2x12 pins, female connector):
12 11 10 09 08 07 06 05 04 03 02 01
--------------------------------------
| # # # # # # # # # # # # | B-row (would be edge connector pins in component side of VRAM expansion pcb)
- ---------------------------------- -
| # # # # # # # # # # # # | A-row (would be edge connector pins in solder side of VRAM expansion pcb)
--------------------------------------
A1 _WE
A2 _RAS
A3 A0
A4 A3
A5 A1
A6 A4
A7 1st Dram I/O4
A8 1st Dram I/O2
A9 2nd Dram-I/O4
A10 2nd Dram-I/O2
A11 5V
A12 GND

B1 N.C.
B2 _CAS1
B3 A7
B4 A2
B5 A5
B6 A6
B7 1st Dram I/O3
B8 1st Dram I/O1
B9 2nd Dram-I/O3
B10 2nd Dram-I/O1
B11 5V
B12 GND

Keyboard connector ( seen at the back of computer) pinout ( 2x10 pins, male connector):
---------------------------------
| 19 17 15 13 11 09 07 05 03 01 |
| 20 18 16 14 12 10 08 06 04 02 |
---------------------------------
1 X2
2 X1
3 X0
4 X3
5 X6
6 X5
7 X3
8 X7
9 Yd
10 Yc
11 Yb
12 Ya
13 +5V
14 GND
15 KANA LED (goes to S3527 via 220ohm resistor)
16 CAPS LED (goes to S3527 via 220ohm resistor)
17 GND
18 GND
19 N.C.
20 N.C.
Note! Pins 9-12 order may not be correct. These pins come from toshiba gate array chip (TC17G005AP-0007), not from S3527 y-pins)

By mars2000you

Enlighted (6227)

Аватар пользователя mars2000you

02-11-2021, 23:42

@msxholder and popolon:

What must I understand with this addition on the Wiki page ?

"It is not a fuse it is a power line filterblok. When the case of a Canon V30F is opened the Vram cartridge can be removed for half the VRAM."

Does it mean that the case of the officialy released version hides a VRAM slot with its cartridge ????

Btw, It would be simpler to first give these precisions here in the forum, otherwise the path is open to misunderstandings, as it has already happened in the past.

By msxholder

Champion (399)

Аватар пользователя msxholder

02-11-2021, 22:58

A powerline filter blok is a wire with ceramic on it for filtering small spikes or interference. Correct about Vram cartridge it can be removed. BTW it has an 64 kb memory mapper also changed . I like to correct things even if someone else handles other priorities in how it should be done.

By mars2000you

Enlighted (6227)

Аватар пользователя mars2000you

02-11-2021, 23:02

Thanks for the explanations, so I can better clarify the page.

By msxholder

Champion (399)

Аватар пользователя msxholder

02-11-2021, 23:03

Question: If i remove serial number it will be a prototype ?

By mars2000you

Enlighted (6227)

Аватар пользователя mars2000you

02-11-2021, 23:24

The case is different, the access to the VRAM slot and cartridge too. The advertised version does not correspond to the version with direct access to this slot.

MSX Magazine (December 1985) pages 164-165:



Страница 5/11
1 | 2 | 3 | 4 | | 6 | 7 | 8 | 9 | 10