Re: [Tomy Tutor ] My new website
- OK, first let me apologize to everyone. The message about the Commie
computers was SUPPOSED to go to Swap personally. I had just got out of
bed and was obviously not fully awake when I wrote and sent that letter.
I don't mean to start any wars, especially when I'm outnumbered here
(and most places as there were approximately 6.8 C64s sold for every
Second, how did the Panasonic JR200 pop up in the Tomy Tutor group? I'm
not even sure I knew what group I was in when I got the link to the
<<--Unfortunately in Win98 today, Netscape 7.0-->>
<<--AMD Athlon 1700XP+ S3 ProSavageDDR 4X AGP-->>
> The Commodore 64 was superior to the Panasonic JR-200U in every
> respect except for Commie BASIC lacking sound and graphic commands.
> If you've been programming the Panasonic JR, you've probably
> discovered that its BASIC sound commands are nothing to write home
> about anyway -- and the sound quality (almost-square waves) is not
> But we're discussing this in the wrong group. This thread should be
> in Home Computers and not in Tomy Tutor.
- Davey, you have nothing to apologize for.
To everybody else;
I personally don't mind these types of conversations as long as they
are civil,-- And I know all of us are old enough and wise enough to
be civil. :)
I remember having heated debates when I was 14 yrs old about the
C=64, (and that was 16 years ago), and I don't need to rehash that
part of my youth. :)
Secondly, there has been little to talk about on the Club board, so I
personally don't mind if we discuss other machines, unless you all
have a problem with doing so. I don't like to censor people unless
it is for something entirely inappropiate.
Thirdly, I consider all of us to be friends who have similiar
collecting hobbies. If you want to talk about other vintage
computers, please fill free to do so. Or, as an example, if you own a
vintage car and want to talk about it, then do so.
This is a free speech board...
whew.... . :)
Happy New Year!
- I want to collect it before you do, but you seem to have a larger
supply of $$$ and space than I do, not to mention a quicker finger on
the E-Bay Bid button!
--- In firstname.lastname@example.org, swap_and_shop <no_reply@y...> wrote:
> Thirdly, I consider all of us to be friends who have similiar
> collecting hobbies. If you want to talk about other vintage
> computers, please fill free to do so. Or, as an example, if you own
> vintage car and want to talk about it, then do so.
- "Cameron Kaiser" <spectre@...> wrote:
> Also working on a comparison architecture between the TI series and theTomy
> (hey, does anyone know if the 9995 in the 99/2 and 99/8 is also muxed?),The 9995 muxes the databus always. The 9995 is the indirect descendant of
> updating all the old information, and I might work on a Tutor-ial page for
> getting started with the Tutor, GRAPHICs mode, etc.
the 9985 that was supposed to be in the 99/4 -- which instead got a 9900
kludged to work similarly to the 9985. The 99/8 uses a special version of
the 9995 that disables most of the on-chip RAM. Not sure about the 99/2.
> The 9995 muxes the databus always. The 9995 is the indirect descendant ofExplain this. Is there another "$8300 page" RAM out there in the 99/8?
> the 9985 that was supposed to be in the 99/4 -- which instead got a 9900
> kludged to work similarly to the 9985. The 99/8 uses a special version of
> the 9995 that disables most of the on-chip RAM.
Is that page connected by the same 16-bit wide path as the 9900's, or muxed
in the same way as the rest of memory access? And what's most of the RAM?
----------------------------- personal page: http://www.armory.com/~spectre/ --
Cameron Kaiser, Point Loma Nazarene University * ckaiser@...
-- A dean is to faculty as a hydrant is to a dog. -- Alfred Kahn --------------
> > The 9995 muxes the databus always. The 9995 is the indirect descendantof
> > the 9985 that was supposed to be in the 99/4 -- which instead got a 9900of
> > kludged to work similarly to the 9985. The 99/8 uses a special version
> > the 9995 that disables most of the on-chip RAM.muxed
> Explain this. Is there another "$8300 page" RAM out there in the 99/8?
> Is that page connected by the same 16-bit wide path as the 9900's, or
> in the same way as the rest of memory access? And what's most of the RAM?The off-the-shelf 9995 has 256 bytes of on-chip RAM at >F000-F0F9 and
>FFFA-FFFF that is on the 16-bit internal bus. The word at >FFFA is theon-chip decrementer and >FFFC-FFFF is the NMI (non-maskable interrupt, or
Load, vector). From what I understand, having never studied the 99/8 in
detail, it has the on-chip RAM at >F000-F0F9 disabled. The Myarc Geneve
9640 uses a standard 9995 and 8K memory pages. Because the 9995 does not
disable the external bus during writes, accessing a page mapped to
>E000-FFFF in the areas >F000-F0F9 and >FFFA-FFFF will mess with even bytesin the page. Internally a 16-bit operation is happenning, but only the even
data byte shows on the external bus.
With regard to the "$8300 page" RAM: This is the CPU PAD of the 99/4A and
the only directly accessible CPU RAM in a stock console. The standard 16K
RAM of the 99/4A is indirectly accessed via the VDP, the TMS9918A in North
American consoles. Much of the console ROM and GROM and peripheral ROM
(DSR's) is written such that the CPU PAD can be relocated.
E.g., the disk controllers typically report error codes at >8350. In the TI
floppy disk controller source code, that error code may have been written
with an instruction such as "MOV @ERR12,@>0050(R9)". The workspace register
R9 in the case of the 99/4A contains >8300. The 99/8 could have its CPU PAD