Curious 71b behavior



#2

I noticed the following curious behavior on one of my older model 71b's (I think it is rom 1bbbb...it has a metal back).

I plugged a HHP 96K ram module into the card reader port. I free'd port 5.00 and 5.01. On the hhp 96K module, this results in a 64K port and 32K port respectively. When I tried to copy a file to port 5.00, I received the error "Insufficient Memory". I can copy files to port 5.01 just fine.

Here's where it gets more interesting. If my forth/assembler rom is present, I can copy to port 5.00.

Also, I have a newer 71b (plastic back) and the HHP 96k ram module works fine in it.

Does my older 71b have a bug which prevents it from utilizing the 64K free'd port? Is this bug somehow overcome with the forth/assembler rom?

Thanks,

Andy


#3

I remember that version 1BBBB had some problem regarding memory configuration with 64k ports. As you noticed, it doesn't show up if a hard-adressed module (like Forth/Ass) is present. There may be other workarounds (after all, the HHP 96k was used with version 1BBBB, too).

What is the result of MEM(5)? of SHOW PORT command?

J-F


#4

MEM(5.00) returns 64K. MEM(5.01) returns 32K.

Let me also re-emphasize, when I just have the hhp 96K module in and ports 5.00 and 5.01 are free'd, I can only write to port 5.01. However, if I plug my 4th/assembler rom in, I can write to 5.00 and the 71b still recognizes both ports.

I have 3 71 version 1BBBB and they all behave the same with the HHP.

It would make sense that it has trouble with the 64K free'd port.

Also, I have a version 1CCDCC and the HHP module works fine on it.


#5

Andy,

You should try to use PORT(5) as 32k and PORT(5.01) as 64k.

J-F


#6

How do I free port 5.00 as 32K instead of 64K? It defaults to 64K when I type "free port(5.00)".

Thanks,

Andy


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