ktktkt

原帖由 dino_lo 於 2007-6-28 15:43 發表
Checked:
[attach]541789[/attach]
J1 on PCB side need to change to GND(near C7)
PS,PIN 3 connect to GND :set serial mode

connection as below
printer port      lt_13264b
lpt.2---------- #5  D ...

Congratulations! One more method to play with!
I took out the LCD and check J1, it seems that it is already connected to GND, isn't it?

dino_lo

MY LCD is not!
Every one should check J1 before use.

kkjason

原帖由 dino_lo 於 2007-6-28 20:00 發表
MY LCD is not!
Every one should check J1 before use.

即係short 左 J1 ???
remove 0ohm resistor and solder on J1?

dino_lo

J1 有一個,單行有三個 焊位( land) ,用一粒 000 marking 的 0ohm電阻, 來short vss 或者 vdd

你會check 到 一 邊是vss(gnd), 中間是 6800/8080 的select ,另一邊是vdd(3.3~5v)

[ 本帖最後由 dino_lo 於 2007-6-28 20:37 編輯 ]

kkjason

原帖由 dino_lo 於 2007-6-28 20:35 發表
J1 有一個,單行有三個 焊位( land) ,用一粒 000 marking 的 0ohm電阻, 來short vss 或者 vdd

你會check 到 一 邊是vss(gnd), 中間是 6800/8080 的select ,另一邊是vdd(3.3~5v)

哦...
依加即係要enable 8080?
比個GND 個lcd?

我塊lcd 同你樣default 係vdd

dino_lo

data sheet 上 叫 是 MI
節錄如下:
Microprocessor Interface select input in parallel mode.
MI = “H”: 6800 series MPU interface
MI = “L”: 8080 series MPU interface

winglim7

for my lcd, the J1 0 ohm resistor was connectd to the header direction....
(different from #38)

any brother have this kind of PCB version?

and will this kind will be ok with the original 89c52 code?

[ 本帖最後由 winglim7 於 2007-6-28 22:36 編輯 ]

winglim7

原帖由 dino_lo 於 2007-6-28 15:01 發表
info 真係推到, sed1565  beta driver, serial mode,
pin 3 gnd>>>serial mode
J1 jumber >>> GND>>> 8080 MODE

so, will it be ok to connect it to rs232 instead of lpt???

dino_lo

MSC-51 是 intel 的, 8080 也是!

j1 移去 c7 比較合理.

serial mode, 都不能直駁 rs-232, 要經 convertion去 ttl 的 logic,才有機會用.

winglim7

原帖由 dino_lo 於 2007-6-28 23:39 發表
MSC-51 是 intel 的, 8080 也是!

j1 移去 c7 比較合理.

serial mode, 都不能直駁 rs-232, 要經 convertion去 ttl 的 logic,才有機會用.

max232