jupiterace's Introduction

Scott's Jupiter Ace Stuff

Boards

You can find the following boards here. Each subdirectory contains the schematic and the gerbers.

other. Contains other usefile files, such as the edge card connector used to make piggyback cards.
ram. Memory expansion board. Adds 48K to bring the RAM up to maximum. With some additional work in the PLD, could support 4 banks for a total of 192KB of RAM.
pi. Raspberry Pi Bus Supervisor. This can take control of the Jupiter Ace's Bus by asserting the BUSREQ signal. Once in control, it can read/write memory or operate on IO ports. It can inject characters into the keyboard buffer and press return. It can do this with entire files to load a whole file via the console. It can also load TAP and ACE files directly into RAM.
rtc. Real-time clock using espon 72421 RTC, and 6 hex digits using TIL311 displays.
speech. Speech synthesizer that is more-or-less compatible with the bigmouth speech synthesizers. Uses the sp0256A-AL2 speech synthesis IC.

Reading any even numbered port will read from the keyboard and move the speaker inward.

Writing any even numbered port will move the speaker outward.

--> Don't use even numbered ports for your own use!!!

decimal	Hex	purpose
69	45	bigmouth phonemes and smbaker speech phonemes
71	47	bigmouth status and smbaker speech status
81	51	smbaker RTC data
83	53	smbaker RTC address
85	55	smbaker RTC digits 0, 1
87	57	smbaker RTC digits 2, 3
89	59	smbaker RTC digits 4, 5
91	5A	smbaker RTC blanking
65533	FFFD	AMI AY-3-8910 register select (WR), AMI AY-3-8912 register read (RD)
49149	BFFD	AMI AY-3-8910 register write

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