New MIB board BOOT ROM

[rietveld]

Does the new MIB board use a 24 or 28 pin Boot EPROM?  Can i use a 8k EPROM and just burn the 4k .BIN twice?

[Tekman]

The MIB238 can use both 24 or 28 pin E/PROMS depending on jumper configuration. Yes, you can double your 4K image if you only have a 8K E/PROM with the correct jumper setting.

 

MIB238 Jumper Settings:

1-2 - Disables Printer port
3-4 - 2764 PROM        ( 8K)    8,192
5-6 - 27256 PROM      ( 32K)    32,768
7-8 - 2732 PROM        ( 4K)    4,096
9-10 - 27128 PROM    ( 16K)    16,384

For a 4K you need to use 27C32 E/PROM and jumper setting 7-8
For a 8K you need to use a 27C64 E/PROM and double your 4K image and use setting 3-4

 

Simple way to combine images:

Windows:
copy /b rom4k.rom + rom4k.rom romt8k.rom

Linux:
cat rom4k.rom rom4k.rom > rom8k.rom

[rietveld]

Thanks.   I am going to burn an EPROM to see if I like the hard drive AUTO booting. 

 

[rietveld]

On 12/27/2020 at 3:43 PM, Tekman said:

The MIB238 can use both 24 or 28 pin E/PROMS depending on jumper configuration. Yes, you can double your 4K image if you only have a 8K E/PROM with the correct jumper setting.

 

MIB238 Jumper Settings:

1-2 - Disables Printer port
3-4 - 2764 PROM        ( 8K)    8,192
5-6 - 27256 PROM      ( 32K)    32,768
7-8 - 2732 PROM        ( 4K)    4,096
9-10 - 27128 PROM    ( 16K)    16,384

For a 4K you need to use 27C32 E/PROM and jumper setting 7-8
For a 8K you need to use a 27C64 E/PROM and double your 4K image and use setting 3-4

 

Simple way to combine images:

Windows:
copy /b rom4k.rom + rom4k.rom romt8k.rom

Linux:
cat rom4k.rom rom4k.rom > rom8k.rom

I burned a 8k rom by doubling the 4k bin file.   works perfect.   thanks