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TF536 buffers

68030 + SDRAM + IDE

Moderators: terriblefire, Terriblefire Moderator

Hsommer
Posts: 10
Joined: 13 Dec 2022 13:44

Re: TF536 buffers

Post by Hsommer »

terriblefire wrote: 03 Jan 2023 10:48 Is your board 2 or 2b? Plain rev2 will not work with buffers but i've no idea how you got it if you did. There was only 10-20 of them made.
It is plain 2 I guess :-(
I bought it from Retroguru.eu in october 2022.
I guess I'll try to modify the connections for IC6 to match the rev 2B...

My board:
download/file.php?mode=view&id=29370

TF536 R2.jpg
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terriblefire
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Re: TF536 buffers

Post by terriblefire »

Hsommer wrote: 03 Jan 2023 11:20 It is plain 2 I guess :-(
I bought it from Retroguru.eu in october 2022.
I guess I'll try to modify the connections for IC6 to match the rev 2B...
Yeah that one will not work with buffers. IC6 has a bug that was fixed. However its not unreasonable to be sold that card as it works perfectly well as it was sold to you. Its just one of the very first batch of rev2s. There is a thread on this site somewhere with the mods needed. Its just a case of shorting something to VCC.

Here is the link to where the mod for early rev2 (non-b's) is.

viewtopic.php?p=37329#p37329
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indicates how much hurting you shall receive."
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terriblefire
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Re: TF536 buffers

Post by terriblefire »

TL;DR

Lift pin 1 (DIR) on IC6 and connect the lifted pin to pin 2 (VCC)
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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Hsommer
Posts: 10
Joined: 13 Dec 2022 13:44

Re: TF536 buffers

Post by Hsommer »

terriblefire wrote: 03 Jan 2023 11:36 TL;DR

Lift pin 1 (DIR) on IC6 and connect the lifted pin to pin 2 (VCC)
Thank you :-)
The buffers work now...
Thank you for all answers in this thread.

Rgds
Henrik
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8 Bit Dreams
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Location: Germany

Re: TF536 buffers

Post by 8 Bit Dreams »

terriblefire wrote: 03 Jan 2023 10:48 Is your board 2 or 2b? Plain rev2 will not work with buffers but i've no idea how you got it if you did. There was only 10-20 of them made.
Fair warning!
released gerbers are indeed revision 2, not revision 2b
ive just checked them here:
viewtopic.php?p=75889#p75889
Retro computer hardware & repair in Germany
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