[Coladam] SmartWriter ROMs

Rich Drushel drushel at apk.net
Tue Jun 17 17:57:16 CEST 2008


On Tue, June 17, 2008 11:06 am, Rich Drushel wrote:

>     Somewhere I have my disassembly of SmartWriter, which includes the
> power-on bootstrap that tries to find expansion ROMs, loads EOS from
> ROM, etc.  That may jog my memory about the memory maps.

    Found it...highest used address in R80 SmartWriter is 7159H (29017
decimal), with the rest of the ROM filled with FF up to 7FFFH (32767).
So, SmartWriter does indeed occupy more than 24K.

    At power-up, the EOS ROM sits at address 6000H (24576 decimal) and
the routine that copies it from ROM to RAM (address E000H, 57344 decimal)
copies 8192 bytes (8K).  6000H is at the 24K boundary...so *MAYBE* the
following?

    4-ROM setup:  SmartWriter 16K + 8K + 8K, EOS 8K
    3-ROM setup:  SmartWriter 16K + 16K, EOS 8K

    *Rich*

-- 
Richard F. Drushel, Ph.D.            | "They fell:  for Heaven to them no hope
Department of Biology                |  imparts / Who hear not for the beating
Case Western Reserve University      |  of their hearts."
Cleveland, Ohio  44106-7080  U.S.A.  |         -- Edgar Allan Poe, "Al-Aaraaf"




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