RE: 8088 and 610 saga continues...

From: Hoffmann-Vetter, Martin <*martinhv_at_arcor.de*> Date: Tue, 25 Jan 2011 22:58:22 +0100 Message-ID: <000c01cbbcda$fcc236f0$1b09a8c0@mhvnb10> · martinhv_at_arcor.de

Hello,

> Yes, I have posted it here:

Thanks!

>> No! The ipc code ends in a endlees jump loop. The 8088 do it when
>> the dram bus is give up. The only way out of this loop is an irq. So
>> i think the 6509 triggers the 8088 over an interrupt.  
> 
> Where do you see this endless loop? Please look at Ruud's disassembly.
> IPC is handled by the "rqster" procedure, I don't see any endless loop
> there. It just sends the IRQ request to 6509, sends parameter bytes,
> then receives the answer bytes and returns.

Or when the ipc command byte has a highest bit set, there is a loop at

> rqstlp:
>		jmp	short rqstlp

Greetings

Martin

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