memory mapping toastrack as in "2nd convention" ?????

ZX80, ZX 81, ZX Spectrum, TS2068 and other clones
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cborn
Well known member
Posts: 267
Joined: Tue Oct 06, 2020 7:45 pm

memory mapping toastrack as in "2nd convention" ?????

Post by cborn »

Hello

In an article of Toni Baker she mentions the 2nd convention and the result off that meeting
http://www.users.globalnet.co.uk/~jg27p ... _names.htm
"into the 128" series

Code: Select all

To make life easier, I shall introduce the concept of PAGE CODES. You
see, each of the eight RAM pages possesses a PAGE CODE, which is a
number between zero and five.

NB: THE PAGE CODE IS NOT THE SAME THING AS THE PAGE NUMBER.
It is the use of page codes which enables us to distinguish between
the two different regions of RAM, and to access the silicon disc area
sensibly. Pages 5, 2 and 0 (ie. normal RAM) all have a page-code of
five. Pages 1, 3, 4, 6 and 7 (ie. the silicon disc area) all have
page-codes less than five - in fact they run in sequence: 0, 1, 2, 3,
4.

This makes addressing of the Spectrum's memory a little simpler.[b][u] Last
month we established the convention whereby every byte in RAM could be
referred to by a five digit hexadecimal number; for instance[/u][/b], the
first byte in the silicon disc area would be referred to as address
1C000. The "1" at the start refers to RAM page one, and the remaining
four digits are the address within that page.

this article is from juni 1987 which concludes that this convention was in may 1987 or maybe 1986 since the first part is from 1986.
for a decent 128 use the AHL + CDE combination needs some special adressing.
does someone know what convention this was and what was discussed further?

and perhaps, is there a legacy off ZX Computing magazine since they closed down?
Toni actualy "promised" more 128k adventures and extended basic for 128k.
The 2nd screen never was used fully and the ramdrive will overwrite it without any protection. i expect and hope for a channel+stream that regulates scr1 from the drive and makes scr1 accessible. well i hope for such legacy some where in a deskdrawer.
cborn
Well known member
Posts: 267
Joined: Tue Oct 06, 2020 7:45 pm

Re: memory mapping toastrack as in "2nd convention" ?????

Post by cborn »

Hello

i did not find any thing about this item except for the TTFn with all the old magazines.
meanwhile i found myself that there are 2 main configurations and systemvariable set for 128 and not 3 as i had in mind. that makes it easier already and i found i seemed to point to the exodos set. so now i know. I still have some thougets about i hope to show such in time.
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