MSX SCSI Interface

Par SoRoS

Supporter (8)

27-05-2011, 04:07

Hi,

Does anyone have the schematics or photo (both sides) of any MSX SCSI interface based on WD33C93A?

I´m trying to find this about a month without lucky.

Thanks a lot your help.

Regards,
Ricardo Sartorato

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Par Manuel

Ascended (19469)

27-05-2011, 19:49

I only have the manual, no schematics...

Par SoRoS

Supporter (8)

28-05-2011, 01:57

Thanks Manuel!

Par frits9164

Resident (64)

04-06-2011, 23:53

SoRoS

http://www.datasheetcatalog.com/datasheets_pdf/W/D/3/3/WD33C93A.shtml

http://www.msxarchive.nl/pub/msx/photos/hardware/HSH_SCSI-interface_version_2_PCB.jpg

frits9164

Par SoRoS

Supporter (8)

05-06-2011, 22:01

Thanks Frits9164!

Do you know what´s the 74LS123 is doing on the circuit?
The 74LS32 and 74LS688 are the port decoder but I have no clue with the 74LS123.

Thanks again!

Par frits9164

Resident (64)

05-06-2011, 22:59

DM74LS123

Dual Retriggerable One-Shot with Clear and Complementary Outputs
General Description
The DM74LS123 is a dual retriggerable monostable multivibrator
capable of generating output pulses from a few
nano-seconds to extremely long duration up to 100% duty
cycle. Each device has three inputs permitting the choice of
either leading edge or trailing edge triggering. Pin (A) is an
active-LOW transition trigger input and pin (B) is an active-
HIGH transition trigger input. The clear (CLR) input terminates
the output pulse at a predetermined time independent
of the timing components. The clear input also serves
as a trigger input when it is pulsed with a low level pulse
transition (
). To obtain the best trouble free operation
from this device please read the operating rules as well as
the Fairchild Semiconductor one-shot application notes
carefully and observe recommendations.

Features
DC triggered from active-HIGH transition or active-LOW
transition inputs
Retriggerable to 100% duty cycle
Compensated for VCC and temperature variations
Triggerable from CLEAR input
DTL, TTL compatible
Input clamp diodes

http://www.alldatasheet.com/datasheet-pdf/pdf/51029/FAIRCHILD/DM74LS123N.html

Frits9164

Par Ota231

Rookie (31)

06-06-2011, 04:54

Hi, I have a SCSI interface. this week I will send photos to your gmail on both sides of SCSI.

Par SoRoS

Supporter (8)

09-06-2011, 13:16

Thanks so much men...
I really need this... with the photos i can finish the layout.

Regards,
Ricardo