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Old 22 February 2019, 22:03   #1
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Problem with 3.1.4 kickstart and Blizzard1260 + maprom

I burnt some 3.1.4 chips for a friend using 105ns 27C400 chips and the high and low binary files he provided.

Looking at the bin files in the burner editor, the characters are in the readable order, so byteswap during loading is not necessary.

With the new chips the A1200 fires up fine without accelerator, and also
with the blizzard if maprom is disabled.

If however maprom is enabled (the jumper on the blizzard board is closed) the
machine only hangs with gray screen during powerup.

Going back from 80MHz to 50MHz oscillator did not solve the problem.

Before we tried without the accelerator, I burnt 3 sets, thinking that even though all chips verified fine, maybe an address pin or an output might
be bad and not handle the bus load in the Amiga (I have seen this before).

But all 3 sets turned out to work fine on a stock A1200,

Is it something obvious I'm missing here?

I have burnt many kickstarts for several types of Amigas with this programmer (Beeprog2) without problem other than the odd broken chip.
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Old 22 February 2019, 22:26   #2
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That's very strange, I'm using 3.1.4 with a 1260 with maprom enabled, and have encountered no issues like this. Have you tested with another 1200?
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Old 22 February 2019, 22:40   #3
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We have not tested with the Blizzard1260 in another A1200, only on unexpanded machines.

Though I did a another set in a machine with Apollo 060, and thats working fine.

With you confirming it works with your system, we probably need to test on another machine.
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Old 28 February 2019, 17:47   #4
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I have 3.1.4 ROM's and both a Blizzard 1260 and 1230 MK IV, they both work fine with Maprom for me too. I realise this isn't much help.
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