[Coco] Intro + DataSheets Request

[Arthur Flexser]

The Basic ROM chip (depending on what model of CoCo you have) is an 8K
chip, compatible with a 68766 EPROM (24 pins).  That's the case if you see
an Extended Basic ROM nearby, or a socket for one.  Some CoCo 2s have both
Color Basic and Extended Basic in a single 16K chip, possibly a 28-pin one
compatible with the 27128 EPROM..

Art

On Tue, Jan 15, 2019 at 8:31 AM M. David Johnson <mdj at bds-soft.com> wrote:

> Hi -
>
>
>
> My name is M. David (Dave) Johnson and, like many of you, I just
> rediscovered the CoCo after many years of absence.
>
>
>
> I got my toes wet with the VCC Emulator, and now I've purchased a 64K CoCo2
> from the colorcomputerstore. I also picked up a floppy controller and a 7"
> TFT LCD monitor on ebay, some cables from Cloud9, and a CoCoSDC and (on
> order) a CoCoVGA from Zippster.
>
>
>
> When I voided my Warranty and opened the CoCo to verify that the MC6847 was
> socketed, I had a stray thought concerning a possibly different method of
> emulation.
>
>
>
> So, I also I checked the other IC chips and then went out to the internet
> to
> try to locate DataSheets on them. I was successful with most, but some I
> could not find. Would anyone here happen to have (or know where I might
> locate) DataSheets for the following:
>
>
>
> U1 - SC77527P 8345 SALT (possibly custom by Tandy),
>
>
>
> U3 - SC77526P 8352 DAC (possibly custom by Tandy),
>
>
>
> U12 - 8040364B 8340 ROM Basic (perhaps vaguely similar to a M2764A 8K x 8
> EPROM ??),
>
>
>
> U13 - SCM92135P 8042364A 8343 ROM Extended Basic (perhaps vaguely similar
> to
> a M2764A 8K x 8 EPROM ??),
>
>
>
> U14 through U21 - 8040665 PQD8350 64K x 1 DRAM (possibly similar to a
> 4164)?
>
>
>
> --
>
> M. David Johnson
>
> mdj at bds-soft.com
>
>
>
>
>
>
> --
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> Coco at maltedmedia.com
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>