Notice: all graphics, html, and text contained on this page are copyrighted and may not be copied!
TWGS
Here is a drawing I did of a Transwarp GS. If you put a real TWGS up to my computer monitor, it is a perfect fit. I spent a few hours on the drawing.
Have you ever wondered what the 40 pin connector on the top of the TWGS accelerator board is for?
Here is a quick look at the famous 40 pin connector on the TranswarpGS accelerator card. This is what was easy to
trace in a few minutes by sight. It is a view from the back of the card. The connector is directly connected to the 65816 CPU. Now I need a pinout for the PLCC socket. (got it. see below)
Here's the pinout from WDC (http://westerndesigncenter.com/ch816S.html):
I got the PLCC socket pinout from:
http://www.methode.com/connector/pdfsforconnector/plcc.pdf
The one on the right is backwards (horizontally flipped) to match the above schematic.
Here is the pinout of the PassTru connector,looking at the front (cache/cpu side). I don't know the conventions for numbering connectors, but I numbered it as I've seen on other connectors.
Here's a chart of the connections. Almost all of the CPU leads have a direct connection to the TWGS CPU passthrough connector. It took about an hour and a half to trace the leads. If you use this information for anything, or find it interesting, send me an email! (I just fixed the error that was introduced when I incorrectly reversed the PLCC socket pinout.)
TWGS CPU PASSTHRU PINOUT
TWGS connector
CPU pin
function
01
22
A11
02
21
A10
03
20
A9
04
19
A8
05
18
A7
06
17
A6
07
16
A5
08
15
A4
09
14
A3
10
13
A2
11
11
A1
12
10
A0
13
??
??
14
08
VPA
15
07
NMIB
16
06
MLB
17
05
IRQB
18
??
??
19
??
??
20
02
VPB
21
01
VSS
22
25
A12
23
26
A13
24
27
A14
25
28
A15
26
29
D7/BA7
27
30
D6/BA6
28
31
D5/BA5
29
31
D4/BA4
30
33
D3/BA3
31
34
D2/BA2
32
25
D1/BA1
33
36
D0/BA0
34
38
R/WB
35
39
E
36
40
BE
37
42
PHI2 (IN)
38
42
M/X
39
43
VDA
40
44
RESB
Have any ideas for the use of the CPU passthru? Let me know!
Email Osites
Or click here to read a few ideas I had as I was designing the page.
COMING SOON: (they're here! ) Cache connector pinouts (all I have to do is upload them. They are already drawn up.). I have cache, passthru schematics. Next thing I want to do is draw up the schematic for the GAL chips and how/where then connect elsewhere on the TWGS.
