Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!purdue!mentor.cc.purdue.edu!pur-ee!young
From: young@pur-ee.UUCP (Mike Young)
Newsgroups: comp.sys.ti
Subject: Re: Addressable memory
Keywords: Linear
Message-ID: <12297@pur-ee.UUCP>
Date: 20 Jul 89 13:11:18 GMT
References: <4752@psuvax1.cs.psu.edu> <1643@csm9a.UUCP> <176@zip.eecs.umich.edu> <8958@chinet.chi.il.us> <1664@csm9a.UUCP> <8998@chinet.chi.il.us>
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In article <8998@chinet.chi.il.us> edlee@chinet.chi.il.us (Edward Lee) writes:
> The TI Extended BASIC cartridge version 1.10 has around 38KB of firmware in
>it, but 38KB is an unusual size for computer memories.  So, I suspect that the 
>TI Extended BASIC cartridge bank-switches firmware to the
>8KB (? It's been a while) area of CPU RAM reserved for cartridge
>memory as it is needed.  I believe the same for the Tunnels of Doom
>cartridge.  Someone please correct me if I am wrong about these
>particulars.  Paul Charlton?
>

	How about:

	3 GROMs @ 6k    =  18k
	1 16k ROM       =  16k
	1 4K RAM        =   4k
		 	______
			   38k

	( this is only a slightly educated guess, based on the examination
of other TI cartridges. Your mileage may vary. ) Note there's no need for
bank switching here. The generic TI peripherals and firmware know nothing
about paging, banking, swapping, etc., as far as I've been able to determine.


>
>-Ed L
>edlee@chinet.chi.il.us

					Mike Young
					Purdue Univ. EE Dept.
					young@ecn.purdue.edu
					...!pur-ee!young